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Human evolution
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Homo sapiens
Human evolution is the evolutionary process that led to the emergence of anatomically modern humans, beginning with the evolutionary history of primates – in particular genus Homo – and leading to the emergence of Homo sapiens as a distinct species of the hominid family, the great apes. This process involved the gradual development of traits such as human bipedalism and language.[1]
The study of human evolution involves many scientific disciplines, including physical anthropology, primatology, archaeology, paleontology, neurobiology, ethology, linguistics, evolutionary psychology, embryology and genetics.[2] Genetic studies show that primates diverged from other mammals about 85 million years ago, in the Late Cretaceous period, and the earliest fossils appear in the Paleocene, around 55 million years ago.[3]
Within the Hominoidea (apes) superfamily, the Hominidae family diverged from the Hylobatidae (gibbon) family some 15–20 million years ago; African great apes (subfamily Homininae) diverged from orangutans (Ponginae) about 14 million years ago; the Hominini tribe (humans, Australopithecines and other extinct biped genera, and chimpanzee) parted from the Gorillini tribe (gorillas) between 9 million years ago and 8 million years ago; and, in turn, the subtribes Hominina (humans and biped ancestors) and Panina (chimps) separated about 7.5 million years ago to 5.6 million years ago.[4]
Contents
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1 Anatomical changes
1.1 Bipedalism
1.2 Encephalization
1.3 Sexual dimorphism
1.4 Ulnar opposition
1.5 Other changes
2 History of study
2.1 Before Darwin
2.2 Darwin
2.3 First fossils
2.4 The East African fossils—and Homo naledi in South Africa
2.5 The genetic revolution
2.6 The quest for the earliest hominin
2.7 Human dispersal
2.7.1 Dispersal of modern Homo sapiens
3 Evidence
3.1 Evidence from molecular biology
3.1.1 Genetics
3.2 Evidence from the fossil record
4 Before Homo
4.1 Early evolution of primates
4.2 Divergence of the human clade from other great apes
4.3 Genus Australopithecus
5 Evolution of genus Homo
5.1 H. habilis and H. gautengensis
5.2 H. rudolfensis and H. georgicus
5.3 H. ergaster and H. erectus
5.4 H. cepranensis and H. antecessor
5.5 H. heidelbergensis
5.6 H. rhodesiensis, and the Gawis cranium
5.7 Neanderthal and Denisovan
5.8 H. floresiensis
5.9 H. sapiens
6 Use of tools
6.1 Stone tools
7 Transition to behavioral modernity
8 Recent and current human evolution
9 Species list
10 See also
11 References
12 Bibliography
13 Further reading
14 External links
Anatomical changes[edit]
The hominoids are descendants of a common ancestor
Human evolution from its first separation from the last common ancestor of humans and chimpanzees is characterized by a number of morphological, developmental, physiological, and behavioral changes. The most significant of these adaptations are bipedalism, increased brain size, lengthened ontogeny (gestation and infancy), and decreased sexual dimorphism. The relationship between these changes is the subject of ongoing debate.[5][page needed] Other significant morphological changes included the evolution of a power and precision grip, a change first occurring in H. erectus.[6]
Bipedalism[edit]
Bipedalism is the basic adaptation of the hominid and is considered the main cause behind a suite of skeletal changes shared by all bipedal hominids. The earliest hominin, of presumably primitive bipedalism, is considered to be either Sahelanthropus[7] or Orrorin, both of which arose some 6 to 7 million years ago. The non-bipedal knuckle-walkers, the gorilla and chimpanzee, diverged from the hominin line over a period covering the same time, so either of Sahelanthropus or Orrorin may be our last shared ancestor. Ardipithecus, a full biped, arose somewhat later.[citation needed]
The early bipeds eventually evolved into the australopithecines and still later into the genus Homo. There are several theories of the adaptation value of bipedalism. It is possible that bipedalism was favored because it freed the hands for reaching and carrying food, saved energy during locomotion,[8] enabled long distance running and hunting, provided an enhanced field of vision, and helped avoid hyperthermia by reducing the surface area exposed to direct sun; features all advantageous for thriving in the new savanna and woodland environment created as a result of the East African Rift Valley uplift versus the previous closed forest habitat.[9][8][10] A new study provides support for the hypothesis that walking on two legs, or bipedalism, evolved because it used less energy than quadrupedal knuckle-walking.[11][12] However, recent studies suggest that bipedality without the ability to use fire would not have allowed global dispersal.[13] This change in gait saw a lengthening of the legs proportionately when compared to the length of the arms, which were shortened through the removal of the need for brachiation. Another change is the shape of the big toe. Recent studies suggest that Australopithecines still lived part of the time in trees as a result of maintaining a grasping big toe. This was progressively lost in Habilines.
Anatomically, the evolution of bipedalism has been accompanied by a large number of skeletal changes, not just to the legs and pelvis, but also to the vertebral column, feet and ankles, and skull.[14] The femur evolved into a slightly more angular position to move the center of gravity toward the geometric center of the body. The knee and ankle joints became increasingly robust to better support increased weight. To support the increased weight on each vertebra in the upright position, the human vertebral column became S-shaped and the lumbar vertebrae became shorter and wider. In the feet the big toe moved into alignment with the other toes to help in forward locomotion. The arms and forearms shortened relative to the legs making it easier to run. The foramen magnum migrated under the skull and more anterior.[15]
The most significant changes occurred in the pelvic region, where the long downward facing iliac blade was shortened and widened as a requirement for keeping the center of gravity stable while walking;[16] bipedal hominids have a shorter but broader, bowl-like pelvis due to this. A drawback is that the birth canal of bipedal apes is smaller than in knuckle-walking apes, though there has been a widening of it in comparison to that of australopithecine and modern humans, permitting the passage of newborns due to the increase in cranial size but this is limited to the upper portion, since further increase can hinder normal bipedal movement.[17]
The shortening of the pelvis and smaller birth canal evolved as a requirement for bipedalism and had significant effects on the process of human birth which is much more difficult in modern humans than in other primates. During human birth, because of the variation in size of the pelvic region, the fetal head must be in a transverse position (compared to the mother) during entry into the birth canal and rotate about 90 degrees upon exit.[18] The smaller birth canal became a limiting factor to brain size increases in early humans and prompted a shorter gestation period leading to the relative immaturity of human offspring, who are unable to walk much before 12 months and have greater neoteny, compared to other primates, who are mobile at a much earlier age.[10] The increased brain growth after birth and the increased dependency of children on mothers had a big effect upon the female reproductive cycle,[19] and the more frequent appearance of alloparenting in humans when compared with other hominids.[20] Delayed human sexual maturity also led to the evolution of menopause with one explanation providing that elderly women could better pass on their genes by taking care of their daughter's offspring, as compared to having more children of their own.[21]
Encephalization[edit]
Brain size and tooth size in hominins.
The human species eventually developed a much larger brain than that of other primates—typically 1,330 cm3 (81 cu in) in modern humans, nearly three times the size of a chimpanzee or gorilla brain.[22] After a period of stasis with Australopithecus anamensis and Ardipithecus, species which had smaller brains as a result of their bipedal locomotion,[23] the pattern of encephalization started with Homo habilis, whose 600 cm3 (37 cu in) brain was slightly larger than that of chimpanzees. This evolution continued in Homo erectus with 800–1,100 cm3 (49–67 cu in), and reached a maximum in Neanderthals with 1,200–1,900 cm3 (73–116 cu in), larger even than modern Homo sapiens. This brain increase manifested during postnatal brain growth, far exceeding that of other apes (heterochrony). It also allowed for extended periods of social learning and language acquisition in juvenile humans, beginning as much as 2 million years ago.
Furthermore, the changes in the structure of human brains may be even more significant than the increase in size.[24][25][26][27]
The size and shape of the skull changed over time. The leftmost, and largest, is a replica of a modern human skull.
The temporal lobes, which contain centers for language processing, have increased disproportionately, as has the prefrontal cortex, which has been related to complex decision-making and moderating social behavior.[22] Encephalization has been tied to increased meat in the diet,[28][29][30] and the development of cooking,[31] and it has been proposed that intelligence increased as a response to an increased necessity for solving social problems as human society became more complex.[32] Changes in skull morphology, such as smaller mandibles and mandible muscle attachments, allowed more room for the brain to grow.[33]
The increase in volume of the neocortex also included a rapid increase in size of the cerebellum. Its function has traditionally been associated with balance and fine motor control, but more recently with speech and cognition. The great apes, including hominids, had a more pronounced cerebellum relative to the neocortex than other primates. It has been suggested that because of its function of sensory-motor control and learning complex muscular actions, the cerebellum may have underpinned human technological adaptations, including the preconditions of speech.[34][35][36][37]
The immediate survival advantage of encephalization is difficult to discern, as the major brain changes from Homo erectus to Homo heidelbergensis were not accompanied by major changes in technology. It has been suggested that the changes were mainly social, including increased empathic abilities[38][39] and increases in size of social groups[40][41][42]
Sexual dimorphism[edit]
The reduced degree of sexual dimorphism in humans is visible primarily in the reduction of the male canine tooth relative to other ape species (except gibbons) and reduced brow ridges and general robustness of males. Another important physiological change related to sexuality in humans was the evolution of hidden estrus. Humans and bonobos are the only apes in which the female is fertile year round and in which no special signals of fertility are produced by the body (such as genital swelling during estrus).[citation needed]
Nonetheless, humans retain a degree of sexual dimorphism in the distribution of body hair and subcutaneous fat, and in the overall size, males being around 15% larger than females. These changes taken together have been interpreted as a result of an increased emphasis on pair bonding as a possible solution to the requirement for increased parental investment due to the prolonged infancy of offspring.
Ulnar opposition[edit]
The ulnar opposition – the contact between the thumb and the tip of the little finger of the same hand – is unique to anatomically modern humans.[43][44] In other primates the thumb is short and unable to touch the little finger.[43] The ulnar opposition facilitates the precision grip and power grip of the human hand, underlying all the skilled manipulations.
Other changes[edit]
A number of other changes have also characterized the evolution of humans, among them an increased importance on vision rather than smell; a smaller gut; loss of body hair; evolution of sweat glands; a change in the shape of the dental arcade from being u-shaped to being parabolic; development of a chin (found in Homo sapiens alone); development of styloid processes; and the development of a descended larynx.
History of study[edit]
Human timeline
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Also see: Life timeline and Nature timeline
Main article: Archaic humans
Before Darwin[edit]
The word homo, the name of the biological genus to which humans belong, is Latin for "human". It was chosen originally by Carl Linnaeus in his classification system. The word "human" is from the Latin humanus, the adjectival form of homo. The Latin "homo" derives from the Indo-European root *dhghem, or "earth".[45] Linnaeus and other scientists of his time also considered the great apes to be the closest relatives of humans based on morphological and anatomical similarities.
Darwin[edit]
The possibility of linking humans with earlier apes by descent became clear only after 1859 with the publication of Charles Darwin's On the Origin of Species, in which he argued for the idea of the evolution of new species from earlier ones. Darwin's book did not address the question of human evolution, saying only that "Light will be thrown on the origin of man and his history."[46]
The first debates about the nature of human evolution arose between Thomas Henry Huxley and Richard Owen. Huxley argued for human evolution from apes by illustrating many of the similarities and differences between humans and apes, and did so particularly in his 1863 book Evidence as to Man's Place in Nature. However, many of Darwin's early supporters (such as Alfred Russel Wallace and Charles Lyell) did not initially agree that the origin of the mental capacities and the moral sensibilities of humans could be explained by natural selection, though this later changed. Darwin applied the theory of evolution and sexual selection to humans when he published The Descent of Man in 1871.[47]
First fossils[edit]
A major problem in the 19th century was the lack of fossil intermediaries. Neanderthal remains were discovered in a limestone quarry in 1856, three years before the publication of On the Origin of Species, and Neanderthal fossils had been discovered in Gibraltar even earlier, but it was originally claimed that these were human remains of a creature suffering some kind of illness.[48] Despite the 1891 discovery by Eugène Dubois of what is now called Homo erectus at Trinil, Java, it was only in the 1920s when such fossils were discovered in Africa, that intermediate species began to accumulate.[citation needed] In 1925, Raymond Dart described Australopithecus africanus.[49] The type specimen was the Taung Child, an australopithecine infant which was discovered in a cave. The child's remains were a remarkably well-preserved tiny skull and an endocast of the brain.
Although the brain was small (410 cm3), its shape was rounded, unlike that of chimpanzees and gorillas, and more like a modern human brain. Also, the specimen showed short canine teeth, and the position of the foramen magnum (the hole in the skull where the spine enters) was evidence of bipedal locomotion. All of these traits convinced Dart that the Taung Child was a bipedal human ancestor, a transitional form between apes and humans.
The East African fossils—and Homo naledi in South Africa[edit]
Fossil hominid evolution display at The Museum of Osteology, Oklahoma City, Oklahoma, U.S..
During the 1960s and 1970s, hundreds of fossils were found in East Africa in the regions of the Olduvai Gorge and Lake Turkana. The driving force of these searches was the Leakey family, with Louis Leakey and his wife Mary Leakey, and later their son Richard and daughter-in-law Meave—all successful and world-renowned fossil hunters and paleoanthropologists. From the fossil beds of Olduvai and Lake Turkana they amassed specimens of the early hominins: the australopithecines and Homo species, and even Homo erectus.
These finds cemented Africa as the cradle of humankind. In the late 1970s and the 1980s, Ethiopia emerged as the new hot spot of paleoanthropology after "Lucy", the most complete fossil member of the species Australopithecus afarensis, was found in 1974 by Donald Johanson near Hadar in the desertic Afar Triangle region of northern Ethiopia. Although the specimen had a small brain, the pelvis and leg bones were almost identical in function to those of modern humans, showing with certainty that these hominins had walked erect.[50] Lucy was classified as a new species, Australopithecus afarensis, which is thought to be more closely related to the genus Homo as a direct ancestor, or as a close relative of an unknown ancestor, than any other known hominid or hominin from this early time range; see terms "hominid" and "hominin".[51] (The specimen was nicknamed "Lucy" after the Beatles' song "Lucy in the Sky with Diamonds", which was played loudly and repeatedly in the camp during the excavations.[52]) The Afar Triangle area would later yield discovery of many more hominin fossils, particularly those uncovered or described by teams headed by Tim D. White in the 1990s, including Ardipithecus ramidus and Ardipithecus kadabba.[53]
In 2013, fossil skeletons of Homo naledi, an extinct species of hominin assigned (provisionally) to the genus Homo, were found in the Rising Star Cave system, a site in South Africa's Cradle of Humankind region in Gauteng province near Johannesburg.[54][55] As of September 2015[update], fossils of at least fifteen individuals, amounting to 1550 specimens, have been excavated from the cave.[55] The species is characterized by a body mass and stature similar to small-bodied human populations, a smaller endocranial volume similar to Australopithecus, and a cranial morphology (skull shape) similar to early Homo species. The skeletal anatomy combines primitive features known from australopithecines with features known from early hominins. The individuals show signs of having been deliberately disposed of within the cave near the time of death. The fossils have not yet been dated.[56]
The genetic revolution[edit]
Louis Leakey examining skulls from Olduvai Gorge, Tanzania
The genetic revolution in studies of human evolution started when Vincent Sarich and Allan Wilson measured the strength of immunological cross-reactions of blood serum albumin between pairs of creatures, including humans and African apes (chimpanzees and gorillas).[57] The strength of the reaction could be expressed numerically as an immunological distance, which was in turn proportional to the number of amino acid differences between homologous proteins in different species. By constructing a calibration curve of the ID of species' pairs with known divergence times in the fossil record, the data could be used as a molecular clock to estimate the times of divergence of pairs with poorer or unknown fossil records.
In their seminal 1967 paper in Science, Sarich and Wilson estimated the divergence time of humans and apes as four to five million years ago,[57] at a time when standard interpretations of the fossil record gave this divergence as at least 10 to as much as 30 million years. Subsequent fossil discoveries, notably "Lucy", and reinterpretation of older fossil materials, notably Ramapithecus, showed the younger estimates to be correct and validated the albumin method.
Progress in DNA sequencing, specifically mitochondrial DNA (mtDNA) and then Y-chromosome DNA (Y-DNA) advanced the understanding of human origins.[58][9][59] Application of the molecular clock principle revolutionized the study of molecular evolution.
On the basis of a separation from the orangutan between 10 and 20 million years ago, earlier studies of the molecular clock suggested that there were about 76 mutations per generation that were not inherited by human children from their parents; this evidence supported the divergence time between hominins and chimps noted above. However, a 2012 study in Iceland of 78 children and their parents suggests a mutation rate of only 36 mutations per generation; this datum extends the separation between humans and chimps to an earlier period greater than 7 million years ago (Ma). Additional research with 226 offspring of wild chimp populations in 8 locations suggests that chimps reproduce at age 26.5 years, on average; which suggests the human divergence from chimps occurred between 7 and 13 million years ago. And these data suggest that Ardipithecus (4.5 Ma), Orrorin (6 Ma) and Sahelanthropus (7 Ma) all may be on the hominid lineage, and even that the separation may have occurred outside the East African Rift region.
Furthermore, analysis of the two species' genes in 2006 provides evidence that after human ancestors had started to diverge from chimpanzees, interspecies mating between "proto-human" and "proto-chimps" nonetheless occurred regularly enough to change certain genes in the new gene pool:
A new comparison of the human and chimp genomes suggests that after the two lineages separated, they may have begun interbreeding... A principal finding is that the X chromosomes of humans and chimps appear to have diverged about 1.2 million years more recently than the other chromosomes.
The research suggests:
There were in fact two splits between the human and chimp lineages, with the first being followed by interbreeding between the two populations and then a second split. The suggestion of a hybridization has startled paleoanthropologists, who nonetheless are treating the new genetic data seriously.[60]
The quest for the earliest hominin[edit]
In the 1990s, several teams of paleoanthropologists were working throughout Africa looking for evidence of the earliest divergence of the hominin lineage from the great apes. In 1994, Meave Leakey discovered Australopithecus anamensis. The find was overshadowed by Tim D. White's 1995 discovery of Ardipithecus ramidus, which pushed back the fossil record to 4.2 million years ago.
In 2000, Martin Pickford and Brigitte Senut discovered, in the Tugen Hills of Kenya, a 6-million-year-old bipedal hominin which they named Orrorin tugenensis. And in 2001, a team led by Michel Brunet discovered the skull of Sahelanthropus tchadensis which was dated as 7.2 million years ago, and which Brunet argued was a bipedal, and therefore a hominid—that is, a hominin (cf Hominidae; terms "hominids" and hominins).
Human dispersal[edit]
A global mapping model of human migration, based from divergence of the mitochondrial DNA (which indicates the matrilineage).[61] Timescale (ka) indicated by colours.
A "trellis" (as Milford H. Wolpoff called it) that emphasizes back-and-forth gene flow among geographic regions.[62]
Different models for the beginning of the present human species.
See also: Early human migrations, Recent African origin of modern humans, Multiregional origin of modern humans, and Early hominids in Southeast Asia
Anthropologists in the 1980s were divided regarding some details of reproductive barriers and migratory dispersals of the Homo genus. Subsequently, genetics has been used to investigate and resolve these issues. According to the Sahara pump theory evidence suggests that genus Homo have migrated out of Africa at least three and possibly four times (e.g. Homo erectus, Homo heidelbergensis and two or three times for Homo sapiens). Recent evidence suggests these dispersals are closely related to fluctuating periods of climate change.[63]
Recent evidence suggests that humans may have left Africa half a million years earlier than previously thought. A joint Franco-Indian team has found human artefacts in the Siwalk Hills north of New Delhi dating back at least 2.6 million years. This is earlier than the previous earliest finding of genus Homo at Dmanisi, in Georgia, dating to 1.85 million years. Although controversial, tools found at a Chinese cave strengthen the case that humans used tools as far back as 2.48 million years ago.[64] This suggests that the Asian "Chopper" tool tradition, found in Java and northern China may have left Africa before the appearance of the Acheulian hand axe.
Dispersal of modern Homo sapiens[edit]
Up until the genetic evidence became available there were two dominant models for the dispersal of modern humans. The multiregional hypothesis proposed that Homo genus contained only a single interconnected population as it does today (not separate species), and that its evolution took place worldwide continuously over the last couple million years. This model was proposed in 1988 by Milford H. Wolpoff.[65][66] In contrast the "out of Africa" model proposed that modern H. sapiens speciated in Africa recently (that is, approximately 200,000 years ago) and the subsequent migration through Eurasia resulted in nearly complete replacement of other Homo species. This model has been developed by Chris B. Stringer and Peter Andrews.[67][68]
Sequencing mtDNA and Y-DNA sampled from a wide range of indigenous populations revealed ancestral information relating to both male and female genetic heritage, and strengthened the Out of Africa theory and weakened the views of Multiregional Evolutionism.[69] Aligned in genetic tree differences were interpreted as supportive of a recent single origin.[70] Analyses have shown a greater diversity of DNA patterns throughout Africa, consistent with the idea that Africa is the ancestral home of mitochondrial Eve and Y-chromosomal Adam, and that modern human dispersal out of Africa has only occurred over the last 55,000 years.[71]
"Out of Africa" has thus gained much support from research using female mitochondrial DNA and the male Y chromosome. After analysing genealogy trees constructed using 133 types of mtDNA, researchers concluded that all were descended from a female African progenitor, dubbed Mitochondrial Eve. "Out of Africa" is also supported by the fact that mitochondrial genetic diversity is highest among African populations.[72]
A broad study of African genetic diversity, headed by Sarah Tishkoff, found the San people had the greatest genetic diversity among the 113 distinct populations sampled, making them one of 14 "ancestral population clusters". The research also located a possible origin of modern human migration in south-western Africa, near the coastal border of Namibia and Angola.[73] The fossil evidence was insufficient for archaeologist Richard Leakey to resolve the debate about exactly where in Africa modern humans first appeared.[74] Studies of haplogroups in Y-chromosomal DNA and mitochondrial DNA have largely supported a recent African origin.[75] All the evidence from autosomal DNA also predominantly supports a Recent African origin. However, evidence for archaic admixture in modern humans, both in Africa and later, throughout Eurasia has recently been suggested by a number of studies.[76]
Recent sequencing of Neanderthal[77] and Denisovan[78] genomes shows that some admixture with these populations has occurred. Modern humans outside Africa have 2–4% Neanderthal alleles in their genome, and some Melanesians have an additional 4–6% of Denisovan alleles. These new results do not contradict the "out of Africa" model, except in its strictest interpretation, although they make the situation more complex. After recovery from a genetic bottleneck that could possibly be due to the Toba supervolcano catastrophe, a fairly small group left Africa and later briefly interbred on three separate occasions with Neanderthals, probably in the middle-east, on the Eurasian steppe or even in North Africa before their departure. Their still predominantly African descendants spread to populate the world. A fraction in turn interbred with Denisovans, probably in south-east Asia, before populating Melanesia.[79] HLA haplotypes of Neanderthal and Denisova origin have been identified in modern Eurasian and Oceanian populations.[80] The Denisovan EPAS1 gene has also been found in Tibetan populations.[81]
There are still differing theories on whether there was a single exodus from Africa or several. A multiple dispersal model involves the Southern Dispersal theory,[82] which has gained support in recent years from genetic, linguistic and archaeological evidence. In this theory, there was a coastal dispersal of modern humans from the Horn of Africa crossing the Bab el Mandib to Yemen at a lower sea level around 70,000 years ago. This group helped to populate Southeast Asia and Oceania, explaining the discovery of early human sites in these areas much earlier than those in the Levant.[82] This group seems to have been dependent upon marine resources for their survival.
Stephen Oppenheimer has proposed a second wave of humans may have later dispersed through the Persian Gulf oases, and the Zagros mountains into the Middle East. Alternatively it may have come across the Sinai Peninsula into Asia, from shortly after 50,000 yrs BP, resulting in the bulk of the human populations of Eurasia. It has been suggested that this second group possibly possessed a more sophisticated "big game hunting" tool technology and was less dependent on coastal food sources than the original group. Much of the evidence for the first group's expansion would have been destroyed by the rising sea levels at the end of each glacial maximum.[82] The multiple dispersal model is contradicted by studies indicating that the populations of Eurasia and the populations of Southeast Asia and Oceania are all descended from the same mitochondrial DNA L3 lineages, which support a single migration out of Africa that gave rise to all non-African populations.[83]
Stephen Oppenheimer, on the basis of the early date of Badoshan Iranian Aurignacian, suggests that this second dispersal, may have occurred with a pluvial period about 50,000 years before the present, with modern human big-game hunting cultures spreading up the Zagros Mountains, carrying modern human genomes from Oman, throughout the Persian Gulf, northward into Armenia and Anatolia, with a variant travelling south into Israel and to Cyrenicia.[84]
Evidence[edit]
The evidence on which scientific accounts of human evolution are based comes from many fields of natural science. The main source of knowledge about the evolutionary process has traditionally been the fossil record, but since the development of genetics beginning in the 1970s, DNA analysis has come to occupy a place of comparable importance. The studies of ontogeny, phylogeny and especially evolutionary developmental biology of both vertebrates and invertebrates offer considerable insight into the evolution of all life, including how humans evolved. The specific study of the origin and life of humans is anthropology, particularly paleoanthropology which focuses on the study of human prehistory.[85]
Evidence from molecular biology[edit]
Family tree showing the extant hominoids: humans (genus Homo), chimpanzees and bonobos (genus Pan), gorillas (genus Gorilla), orangutans (genus Pongo), and gibbons (four genera of the family Hylobatidae: Hylobates, Hoolock, Nomascus, and Symphalangus). All except gibbons are hominids.
The closest living relatives of humans are bonobos and chimpanzees (both genus Pan) and gorillas (genus Gorilla).[86] With the sequencing of both the human and chimpanzee genome, as of 2012 estimates of the similarity between their DNA sequences range between 95% and 99%.[86][87][88] By using the technique called the molecular clock which estimates the time required for the number of divergent mutations to accumulate between two lineages, the approximate date for the split between lineages can be calculated.
The gibbons (family Hylobatidae) and then orangutans (genus Pongo) were the first groups to split from the line leading to the hominins, including humans—followed by gorillas, and, ultimately, by the chimpanzees (genus Pan). The splitting date between hominin and chimpanzee lineages is placed by some between 4 to 8 million years ago, that is, during the Late Miocene.[4][89][90] Speciation, however, appears to have been unusually drawn-out. Initial divergence occurred sometime between 7 to 13 million years ago, but ongoing hybridization blurred the separation and delayed complete separation during several millions of years. Patterson (2006) dated the final divergence at 5 to 6 million years ago.[91]
Genetic evidence has also been employed to resolve the question of whether there was any gene flow between early modern humans and Neanderthals, and to enhance our understanding of the early human migration patterns and splitting dates. By comparing the parts of the genome that are not under natural selection and which therefore accumulate mutations at a fairly steady rate, it is possible to reconstruct a genetic tree incorporating the entire human species since the last shared ancestor.
Each time a certain mutation (single-nucleotide polymorphism) appears in an individual and is passed on to his or her descendants a haplogroup is formed including all of the descendants of the individual who will also carry that mutation. By comparing mitochondrial DNA which is inherited only from the mother, geneticists have concluded that the last female common ancestor whose genetic marker is found in all modern humans, the so-called mitochondrial Eve, must have lived around 200,000 years ago.
Genetics[edit]
Main articles: Human evolutionary genetics and Human genetic variation
Human evolutionary genetics studies how one human genome differs from the other, the evolutionary past that gave rise to it, and its current effects. Differences between genomes have anthropological, medical and forensic implications and applications. Genetic data can provide important insight into human evolution.
Evidence from the fossil record[edit]
Replica of fossil skull of Homo habilis. Fossil number KNM ER 1813, found at Koobi Fora, Kenya.
Replica of fossil skull of Homo ergaster (African Homo erectus). Fossil number Khm-Heu 3733 discovered in 1975 in Kenya.
There is little fossil evidence for the divergence of the gorilla, chimpanzee and hominin lineages.[92] The earliest fossils that have been proposed as members of the hominin lineage are Sahelanthropus tchadensis dating from 7 million years ago, Orrorin tugenensis dating from 5.7 million years ago, and Ardipithecus kadabba dating to 5.6 million years ago. Each of these have been argued to be a bipedal ancestor of later hominins but, in each case, the claims have been contested. It is also possible that one or more of these species are ancestors of another branch of African apes, or that they represent a shared ancestor between hominins and other apes.
The question then of the relationship between these early fossil species and the hominin lineage is still to be resolved. From these early species, the australopithecines arose around 4 million years ago and diverged into robust (also called Paranthropus) and gracile branches, one of which (possibly A. garhi) probably went on to become ancestors of the genus Homo. The australopithecine species that is best represented in the fossil record is Australopithecus afarensis with more than one hundred fossil individuals represented, found from Northern Ethiopia (such as the famous "Lucy"), to Kenya, and South Africa. Fossils of robust australopithecines such as Au. robustus (or alternatively Paranthropus robustus) and Au./P. boisei are particularly abundant in South Africa at sites such as Kromdraai and Swartkrans, and around Lake Turkana in Kenya.
The earliest member of the genus Homo is Homo habilis which evolved around 2.8 million years ago.[93] Homo habilis is the first species for which we have positive evidence of the use of stone tools. They developed the Oldowan lithic technology, named after the Olduvai Gorge in which the first specimens were found. Some scientists consider Homo rudolfensis, a larger bodied group of fossils with similar morphology to the original H. habilis fossils, to be a separate species while others consider them to be part of H. habilis—simply representing intraspecies variation, or perhaps even sexual dimorphism. The brains of these early hominins were about the same size as that of a chimpanzee, and their main adaptation was bipedalism as an adaptation to terrestrial living.
During the next million years, a process of encephalization began and, by the arrival (about 1.9 million years ago) of Homo erectus in the fossil record, cranial capacity had doubled. Homo erectus were the first of the hominins to emigrate from Africa, and, from 1.8 to 1.3 million years ago, this species spread through Africa, Asia, and Europe. One population of H. erectus, also sometimes classified as a separate species Homo ergaster, remained in Africa and evolved into Homo sapiens. It is believed that these species, H. erectus and H. ergaster, were the first to use fire and complex tools.
The earliest transitional fossils between H. ergaster/erectus and archaic H. sapiens are from Africa, such as Homo rhodesiensis, but seemingly transitional forms were also found at Dmanisi, Georgia. These descendants of African H. erectus spread through Eurasia from ca. 500,000 years ago evolving into H. antecessor, H. heidelbergensis and H. neanderthalensis. The earliest fossils of anatomically modern humans are from the Middle Paleolithic, about 200,000 years ago such as the Omo remains of Ethiopia; later fossils from Es Skhul cave in Israel and Southern Europe begin around 90,000 years ago (0.09 million years ago).
As modern humans spread out from Africa, they encountered other hominins such as Homo neanderthalensis and the so-called Denisovans, who may have evolved from populations of Homo erectus that had left Africa around 2 million years ago. The nature of interaction between early humans and these sister species has been a long-standing source of controversy, the question being whether humans replaced these earlier species or whether they were in fact similar enough to interbreed, in which case these earlier populations may have contributed genetic material to modern humans.[94][95]
This migration out of Africa is estimated to have begun about 70,000 years BP and modern humans subsequently spread globally, replacing earlier hominins either through competition or hybridization. They inhabited Eurasia and Oceania by 40,000 years BP, and the Americas by at least 14,500 years BP.[96]
Before Homo[edit]
For evolutionary history before primates, see Evolution of mammals, Evolutionary history of life, and Timeline of human evolution.
Early evolution of primates[edit]
See also: Evolution of primates
Evolutionary history of the primates can be traced back 65 million years.[97] One of the oldest known primate-like mammal species, the Plesiadapis, came from North America;[98] another, Archicebus, came from China.[99] Other similar basal primates were widespread in Eurasia and Africa during the tropical conditions of the Paleocene and Eocene.
Notharctus tenebrosus, American Museum of Natural History, New York City, New York, USA.
David R. Begun [100] concluded that early primates flourished in Eurasia and that a lineage leading to the African apes and humans, including to Dryopithecus, migrated south from Europe or Western Asia into Africa. The surviving tropical population of primates—which is seen most completely in the Upper Eocene and lowermost Oligocene fossil beds of the Faiyum depression southwest of Cairo—gave rise to all extant primate species, including the lemurs of Madagascar, lorises of Southeast Asia, galagos or "bush babies" of Africa, and to the anthropoids, which are the Platyrrhines or New World monkeys, the Catarrhines or Old World monkeys, and the great apes, including humans and other hominids.
The earliest known catarrhine is Kamoyapithecus from uppermost Oligocene at Eragaleit in the northern Great Rift Valley in Kenya, dated to 24 million years ago.[101] Its ancestry is thought to be species related to Aegyptopithecus, Propliopithecus, and Parapithecus from the Faiyum, at around 35 million years ago.[102] In 2010, Saadanius was described as a close relative of the last common ancestor of the crown catarrhines, and tentatively dated to 29–28 million years ago, helping to fill an 11-million-year gap in the fossil record.[103]
Reconstructed tailless Proconsul skeleton
In the Early Miocene, about 22 million years ago, the many kinds of arboreally adapted primitive catarrhines from East Africa suggest a long history of prior diversification. Fossils at 20 million years ago include fragments attributed to Victoriapithecus, the earliest Old World monkey. Among the genera thought to be in the ape lineage leading up to 13 million years ago are Proconsul, Rangwapithecus, Dendropithecus, Limnopithecus, Nacholapithecus, Equatorius, Nyanzapithecus, Afropithecus, Heliopithecus, and Kenyapithecus, all from East Africa.
The presence of other generalized non-cercopithecids of Middle Miocene from sites far distant—Otavipithecus from cave deposits in Namibia, and Pierolapithecus and Dryopithecus from France, Spain and Austria—is evidence of a wide diversity of forms across Africa and the Mediterranean basin during the relatively warm and equable climatic regimes of the Early and Middle Miocene. The youngest of the Miocene hominoids, Oreopithecus, is from coal beds in Italy that have been dated to 9 million years ago.
Molecular evidence indicates that the lineage of gibbons (family Hylobatidae) diverged from the line of great apes some 18–12 million years ago, and that of orangutans (subfamily Ponginae) diverged from the other great apes at about 12 million years; there are no fossils that clearly document the ancestry of gibbons, which may have originated in a so-far-unknown South East Asian hominoid population, but fossil proto-orangutans may be represented by Sivapithecus from India and Griphopithecus from Turkey, dated to around 10 million years ago.[16]
Divergence of the human clade from other great apes[edit]
A reconstruction of "Lucy", a female Australopithecus afarensis on exhibit in the National Museum of Natural History, Washington, D.C., USA.
Species close to the last common ancestor of gorillas, chimpanzees and humans may be represented by Nakalipithecus fossils found in Kenya and Ouranopithecus found in Greece. Molecular evidence suggests that between 8 and 4 million years ago, first the gorillas, and then the chimpanzees (genus Pan) split off from the line leading to the humans. Human DNA is approximately 98.4% identical to that of chimpanzees when comparing single nucleotide polymorphisms (see human evolutionary genetics). The fossil record, however, of gorillas and chimpanzees is limited; both poor preservation—rain forest soils tend to be acidic and dissolve bone—and sampling bias probably contribute to this problem.
Other hominins probably adapted to the drier environments outside the equatorial belt; and there they encountered antelope, hyenas, dogs, pigs, elephants, horses, and others. The equatorial belt contracted after about 8 million years ago, and there is very little fossil evidence for the split—thought to have occurred around that time—of the hominin lineage from the lineages of gorillas and chimpanzees. The earliest fossils argued by some to belong to the human lineage are Sahelanthropus tchadensis (7 Ma) and Orrorin tugenensis (6 Ma), followed by Ardipithecus (5.5–4.4 Ma), with species Ar. kadabba and Ar. ramidus.
It has been argued in a study of the life history of Ar. ramidus that the species provides evidence for a suite of anatomical and behavioral adaptations in very early hominins unlike any species of extant great ape.[104] This study demonstrated affinities between the skull morphology of Ar. ramidus and that of infant and juvenile chimpanzees, suggesting the species evolved a juvenalised or paedomorphic craniofacial morphology via heterochronic dissociation of growth trajectories. It was also argued that the species provides support for the notion that very early hominins, akin to bonobos (Pan paniscus) the less aggressive species of chimpanzee, may have evolved via the process of self-domestication. Consequently, arguing against the so-called "chimpanzee referential model"[105] the authors suggest it is no longer tenable to use common chimpanzee (Pan troglodytes) social and mating behaviors in models of early hominin social evolution. When commenting on the absence of aggressive canine morphology in Ar. ramidus and the implications this has for the evolution of hominin social psychology, they wrote:
Of course Ar. ramidus differs significantly from bonobos, bonobos having retained a functional canine honing complex. However, the fact that Ar. ramidus shares with bonobos reduced sexual dimorphism, and a more paedomorphic form relative to chimpanzees, suggests that the developmental and social adaptations evident in bonobos may be of assistance in future reconstructions of early hominin social and sexual psychology. In fact the trend towards increased maternal care, female mate selection and self-domestication may have been stronger and more refined in Ar. ramidus than what we see in bonobos.[104]:128
The authors argue that many of the basic human adaptations evolved in the ancient forest and woodland ecosystems of late Miocene and early Pliocene Africa. Consequently, they argue that humans may not represent evolution from a chimpanzee-like ancestor as has traditionally been supposed. This suggests many modern human adaptations represent phylogenetically deep traits and that the behavior and morphology of chimpanzees may have evolved subsequent to the split with the common ancestor they share with humans.
Genus Australopithecus[edit]
Main article: Australopithecus
The Australopithecus genus evolved in eastern Africa around 4 million years ago before spreading throughout the continent and eventually becoming extinct 2 million years ago. During this time period various forms of australopiths existed, including Australopithecus anamensis, Au. afarensis, Au. sediba, and Au. africanus. There is still some debate among academics whether certain African hominid species of this time, such as Au. robustus and Au. boisei, constitute members of the same genus; if so, they would be considered to be Au. robust australopiths whilst the others would be considered Au. gracile australopiths. However, if these species do indeed constitute their own genus, then they may be given their own name, the Paranthropus.
Australopithecus (4–1.8 Ma), with species Au. anamensis, Au. afarensis, Au. africanus, Au. bahrelghazali, Au. garhi, and Au. sediba;
Kenyanthropus (3–2.7 Ma), with species K. platyops;
Paranthropus (3–1.2 Ma), with species P. aethiopicus, P. boisei, and P. robustus
A new proposed species Australopithecus deyiremeda is claimed to have been discovered living at the same time period of Au. afarensis. There is debate if Au. deyiremeda is a new species or is Au. afarensis.[106] Australopithecus prometheus, otherwise known as Little Foot has recently been dated at 3.67 million years old through a new dating technique, making the Australopithecus genus as old as the Afarensis.[107] Given the opposable big toe found on Little Foot, it seems that he was a good climber, and it is thought given the night predators of the region, he probably, like gorillas and chimpanzees, built a nesting platform at night, in the trees.
Evolution of genus Homo[edit]
The earliest documented representative of the genus Homo is Homo habilis, which evolved around 2.8 million years ago,[93] and is arguably the earliest species for which there is positive evidence of the use of stone tools. The brains of these early hominins were about the same size as that of a chimpanzee, although it has been suggested that this was the time in which the human SRGAP2 gene doubled, producing a more rapid wiring of the frontal cortex. During the next million years a process of rapid encephalization occurred, and with the arrival of Homo erectus and Homo ergaster in the fossil record, cranial capacity had doubled to 850 cm3.[108] (Such an increase in human brain size is equivalent to each generation having 125,000 more neurons than their parents.) It is believed that Homo erectus and Homo ergaster were the first to use fire and complex tools, and were the first of the hominin line to leave Africa, spreading throughout Africa, Asia, and Europe between 1.3 to 1.8 million years ago.
One current view of the temporal and geographical distribution of genus Homo populations.[109] Other interpretations differ mainly in the taxonomy and geographical distribution of hominin species.
According to the recent African origin of modern humans theory, modern humans evolved in Africa possibly from Homo heidelbergensis, Homo rhodesiensis or Homo antecessor and migrated out of the continent some 50,000 to 100,000 years ago, gradually replacing local populations of Homo erectus, Denisova hominins, Homo floresiensis and Homo neanderthalensis.[110][111][112][113][114] Archaic Homo sapiens, the forerunner of anatomically modern humans, evolved in the Middle Paleolithic between 400,000 and 250,000 years ago.[115][116][117] Recent DNA evidence suggests that several haplotypes of Neanderthal origin are present among all non-African populations, and Neanderthals and other hominins, such as Denisovans, may have contributed up to 6% of their genome to present-day humans, suggestive of a limited inter-breeding between these species.[78][118][80] The transition to behavioral modernity with the development of symbolic culture, language, and specialized lithic technology happened around 50,000 years ago according to some anthropologists[119] although others point to evidence that suggests that a gradual change in behavior took place over a longer time span.[120]
Homo sapiens is the only extant species of its genus, Homo. While some (extinct) Homo species might have been ancestors of Homo sapiens, many, perhaps most, were likely "cousins", having speciated away from the ancestral hominin line.[121][122] There is yet no consensus as to which of these groups should be considered a separate species and which should be a subspecies; this may be due to the dearth of fossils or to the slight differences used to classify species in the Homo genus.[122] The Sahara pump theory (describing an occasionally passable "wet" Sahara desert) provides one possible explanation of the early variation in the genus Homo.
Based on archaeological and paleontological evidence, it has been possible to infer, to some extent, the ancient dietary practices[30] of various Homo species and to study the role of diet in physical and behavioral evolution within Homo.[27][123][124][125][126]
Some anthropologists and archaeologists subscribe to the Toba catastrophe theory, which posits that the supereruption of Lake Toba on Sumatran island in Indonesia some 70,000 years ago caused global consequences,[127] killing the majority of humans and creating a population bottleneck that affected the genetic inheritance of all humans today.[128]
H. habilis and H. gautengensis[edit]
Homo habilis lived from about 2.8[93] to 1.4 Ma. The species evolved in South and East Africa in the Late Pliocene or Early Pleistocene, 2.5–2 Ma, when it diverged from the australopithecines. Homo habilis had smaller molars and larger brains than the australopithecines, and made tools from stone and perhaps animal bones. One of the first known hominins, it was nicknamed 'handy man' by discoverer Louis Leakey due to its association with stone tools. Some scientists have proposed moving this species out of Homo and into Australopithecus due to the morphology of its skeleton being more adapted to living on trees rather than to moving on two legs like Homo sapiens.[129]
In May 2010, a new species, Homo gautengensis, was discovered in South Africa.[130]
H. rudolfensis and H. georgicus[edit]
These are proposed species names for fossils from about 1.9–1.6 Ma, whose relation to Homo habilis is not yet clear.
Homo rudolfensis refers to a single, incomplete skull from Kenya. Scientists have suggested that this was another Homo habilis, but this has not been confirmed.[131]
Homo georgicus, from Georgia, may be an intermediate form between Homo habilis and Homo erectus,[132] or a sub-species of Homo erectus.[133]
H. ergaster and H. erectus[edit]
The first fossils of Homo erectus were discovered by Dutch physician Eugene Dubois in 1891 on the Indonesian island of Java. He originally named the material Pithecanthropus erectus based on its morphology, which he considered to be intermediate between that of humans and apes.[134] Homo erectus lived from about 1.8 Ma to about 70,000 years ago—which would indicate that they were probably wiped out by the Toba catastrophe; however, nearby Homo floresiensis survived it. The early phase of Homo erectus, from 1.8 to 1.25 Ma, is considered by some to be a separate species, Homo ergaster, or as Homo erectus ergaster, a subspecies of Homo erectus.
In Africa in the Early Pleistocene, 1.5–1 Ma, some populations of Homo habilis are thought to have evolved larger brains and to have made more elaborate stone tools; these differences and others are sufficient for anthropologists to classify them as a new species, Homo erectus—in Africa.[135] The evolution of locking knees and the movement of the foramen magnum are thought to be likely drivers of the larger population changes. This species also may have used fire to cook meat. Richard Wrangham suggests that the fact that Homo seems to have been ground dwelling, with reduced intestinal length, smaller dentition, "and swelled our brains to their current, horrendously fuel-inefficient size",[136] suggest that control of fire and releasing increased nutritional value through cooking was the key adaptation that separated Homo from tree-sleeping Australopitheicines.[137]
See also: Control of fire by early humans
A famous example of Homo erectus is Peking Man; others were found in Asia (notably in Indonesia), Africa, and Europe. Many paleoanthropologists now use the term Homo ergaster for the non-Asian forms of this group, and reserve Homo erectus only for those fossils that are found in Asia and meet certain skeletal and dental requirements which differ slightly from H. ergaster.
H. cepranensis and H. antecessor[edit]
These are proposed as species that may be intermediate between H. erectus and H. heidelbergensis.
H. antecessor is known from fossils from Spain and England that are dated 1.2 Ma–500 ka.[138][139]
H. cepranensis refers to a single skull cap from Italy, estimated to be about 800,000 years old.[140]
H. heidelbergensis[edit]
Main article: Homo heidelbergensis
H. heidelbergensis ("Heidelberg Man") lived from about 800,000 to about 300,000 years ago. Also proposed as Homo sapiens heidelbergensis or Homo sapiens paleohungaricus.[141]
H. rhodesiensis, and the Gawis cranium[edit]
H. rhodesiensis, estimated to be 300,000–125,000 years old. Most current researchers place Rhodesian Man within the group of Homo heidelbergensis, though other designations such as archaic Homo sapiens and Homo sapiens rhodesiensis have been proposed.
In February 2006 a fossil, the Gawis cranium, was found which might possibly be a species intermediate between H. erectus and H. sapiens or one of many evolutionary dead ends. The skull from Gawis, Ethiopia, is believed to be 500,000–250,000 years old. Only summary details are known, and the finders have not yet released a peer-reviewed study. Gawis man's facial features suggest its being either an intermediate species or an example of a "Bodo man" female.[142]
Neanderthal and Denisovan[edit]
Main articles: Neanderthal and Denisovan
Reconstruction of Homo heidelbergensis which may be the direct ancestor of both Homo neanderthalensis and Homo sapiens.
Homo neanderthalensis, alternatively designated as Homo sapiens neanderthalensis,[143] lived in Europe and Asia from 400,000[144] to about 28,000 years ago.[145] There are a number of clear anatomical differences between anatomically modern humans (AMH) and Neanderthal populations. Many of these relate to the superior adaption to cold environments possessed by the Neanderthal populations. Their surface to volume ratio is an extreme version of that found amongst Inuit populations, indicating that they were less inclined to lose body heat than were AMH. From brain Endocasts, Neanderthals also had significantly larger brains. This would seem to indicate that the intellectual superiority of AMH populations may be questionable. More recent research by Eiluned Pearce, Chris Stringer, R. I. M. Dunbar, however, have shown important differences in Brain architecture. For example, in both the orbital chamber size and in the size of the occipital lobe, the larger size suggests that the Neanderthal had a better visual acuity than modern humans. This would give a superior vision in the inferior light conditions found in Glacial Europe. It also seems that the higher body mass of Neanderthals had a correspondingly larger brain mass required for body care and control. The Neanderthal populations seem to have been physically superior to AMH populations. These differences may have been sufficient to give Neanderthal populations an environmental superiority to AMH populations from 75,000 to 45,000 years BP. With these differences, Neanderthal brains show a smaller area was available for social functioning. Plotting group size possible from endocrainial volume, suggests that AMH populations (minus occipital lobe size), had a Dunbars number of 144 possible relationships. Neanderthal populations seem to have been limited to about 120 individuals. This would show up in a larger number of possible mates for AMH humans, with increased risks of inbreeding amongst Neanderthal populations. It also suggests that humans had larger trade catchment areas than Neanderthals (confirmed in the distribution of stone tools). With larger populations, social and technological innovations were easier to fix in human populations, which may have all contributed to the fact that modern Homo sapiens replaced the Neanderthal populations by 28,000 BP.[146]
Dermoplastic reconstruction of a Neanderthal
Earlier evidence from sequencing mitochondrial DNA suggested that no significant gene flow occurred between H. neanderthalensis and H. sapiens, and that the two were separate species that shared a common ancestor about 660,000 years ago.[147][148][149] However, a sequencing of the Neanderthal genome in 2010 indicated that Neanderthals did indeed interbreed with anatomically modern humans circa 45,000 to 80,000 years ago (at the approximate time that modern humans migrated out from Africa, but before they dispersed into Europe, Asia and elsewhere).[150] The genetic sequencing of a human from Romania dated 40,000 years ago showed that 11% of their genome was Neanderthal. This would indicate that this individual had a Neanderthal great grandparent, 4 generations previously. It seems that this individual has left no living descendants.
Nearly all modern non-African humans have 1% to 4% of their DNA derived from Neanderthal DNA,[150] and this finding is consistent with recent studies indicating that the divergence of some human alleles dates to one Ma, although the interpretation of these studies has been questioned.[151][152] Neanderthals and Homo sapiens could have co-existed in Europe for as long as 10,000 years, during which human populations exploded vastly outnumbering Neanderthals, possibly outcompeting them by sheer numerical strength.[153]
In 2008, archaeologists working at the site of Denisova Cave in the Altai Mountains of Siberia uncovered a small bone fragment from the fifth finger of a juvenile member of Denisovans.[154] Artifacts, including a bracelet, excavated in the cave at the same level were carbon dated to around 40,000 BP. As DNA had survived in the fossil fragment due to the cool climate of the Denisova Cave, both mtDNA and nuclear DNA were sequenced.[78][155]
While the divergence point of the mtDNA was unexpectedly deep in time,[156] the full genomic sequence suggested the Denisovans belonged to the same lineage as Neanderthals, with the two diverging shortly after their line split from the lineage that gave rise to modern humans.[78] Modern humans are known to have overlapped with Neanderthals in Europe and the Near East for possibly more than 40,000 years,[157] and the discovery raises the possibility that Neanderthals, Denisovans, and modern humans may have co-existed and interbred. The existence of this distant branch creates a much more complex picture of humankind during the Late Pleistocene than previously thought.[155][158] Evidence has also been found that as much as 6% of the DNA of some modern Melanesians derive from Denisovans, indicating limited interbreeding in Southeast Asia.[79][159]
Alleles thought to have originated in Neanderthals and Denisovans have been identified at several genetic loci in the genomes of modern humans outside of Africa. HLA haplotypes from Denisovans and Neanderthal represent more than half the HLA alleles of modern Eurasians,[80] indicating strong positive selection for these introgressed alleles. Corinne Simoneti at Vanderbilt University, in Nashville and her team have found from medical records of 28,000 people of European descent that the presence of Neanderthal DNA segments may be associated with a likelihood to suffer depression more frequently.[160]
The flow of genes from Neanderthal populations to modern human was not all one way. Sergi Castellano of the Max Planck Institute for Evolutionary Anthropology in Leipzig, Germany, has in 2016 reported that while Denisovan and Neanderthal genomes are more related to each other than they are to us, Siberian Neanderthal genomes show similarity to the modern human gene pool, more so than to European Neanderthal populations. The evidence suggests that the Neanderthal populations interbred with modern humans possibly 100,000 years ago, probably somewhere in the Near East.[161]
Studies of a Neanderthal child at Gibraltar show from brain development and teeth eruption that Neanderthal children may have matured more rapidly than is the case for Homo sapiens.[162]
H. floresiensis[edit]
Main article: Homo floresiensis
H. floresiensis, which lived from approximately 190,000 to 50,000 years before present, has been nicknamed hobbit for its small size, possibly a result of insular dwarfism.[163] H. floresiensis is intriguing both for its size and its age, being an example of a recent species of the genus Homo that exhibits derived traits not shared with modern humans. In other words, H. floresiensis shares a common ancestor with modern humans, but split from the modern human lineage and followed a distinct evolutionary path. The main find was a skeleton believed to be a woman of about 30 years of age. Found in 2003, it has been dated to approximately 18,000 years old. The living woman was estimated to be one meter in height, with a brain volume of just 380 cm3 (considered small for a chimpanzee and less than a third of the H. sapiens average of 1400 cm3).[citation needed]
However, there is an ongoing debate over whether H. floresiensis is indeed a separate species.[164] Some scientists hold that H. floresiensis was a modern H. sapiens with pathological dwarfism.[165] This hypothesis is supported in part, because some modern humans who live on Flores, the Indonesian island where the skeleton was found, are pygmies. This, coupled with pathological dwarfism, could have resulted in a significantly diminutive human. The other major attack on H. floresiensis as a separate species is that it was found with tools only associated with H. sapiens.[165]
The hypothesis of pathological dwarfism, however, fails to explain additional anatomical features that are unlike those of modern humans (diseased or not) but much like those of ancient members of our genus. Aside from cranial features, these features include the form of bones in the wrist, forearm, shoulder, knees, and feet. Additionally, this hypothesis fails to explain the find of multiple examples of individuals with these same characteristics, indicating they were common to a large population, and not limited to one individual.[citation needed]
H. sapiens[edit]
Main article: Archaic humans
H. sapiens (the adjective sapiens is Latin for "wise" or "intelligent") evolved between 350,000 and 260,000 years ago.[166] Between 400,000 years ago and the second interglacial period in the Middle Pleistocene, around 250,000 years ago, the trend in intra-cranial volume expansion and the elaboration of stone tool technologies developed, providing evidence for a transition from H. erectus to H. sapiens. The direct evidence suggests there was a migration of H. erectus out of Africa, then a further speciation of H. sapiens from H. erectus in Africa. A subsequent migration (both within and out of Africa) eventually replaced the earlier dispersed H. erectus. This migration and origin theory is usually referred to as the "recent single-origin hypothesis" or "out of Africa" theory. Current evidence does not preclude some multiregional evolution or some admixture of the migrant H. sapiens with existing Homo populations. This is a hotly debated area of paleoanthropology.
Current research has established that humans are genetically highly homogenous; that is, the DNA of individuals is more alike than usual for most species, which may have resulted from their relatively recent evolution or the possibility of a population bottleneck resulting from cataclysmic natural events such as the Toba catastrophe.[167][168] Distinctive genetic characteristics have arisen, however, primarily as the result of small groups of people moving into new environmental circumstances. These adapted traits are a very small component of the Homo sapiens genome, but include various characteristics such as skin color and nose form, in addition to internal characteristics such as the ability to breathe more efficiently at high altitudes.
H. sapiens idaltu, from Ethiopia, is an extinct sub-species from about 160,000 years ago who is argued to be the direct ancestor of all modern humans.
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Comparative table of Homo species
Species
Temporal range kya
Habitat
Adult height
Adult mass
Cranial capacity (cm³)
Fossil record
Discovery / publication of name
H. habilis 2,100 – 1,500[169] Africa 110-140 cm (4 ft 11 in) 33–55 kg (73–121 lb) 510–660 Many 1960/1964
H. erectus 1,900 – 70
[170]
Africa, Eurasia (Java, China, India, Caucasus) 180 cm (5 ft 11 in) 60 kg (130 lb) 850 (early) – 1,100 (late) Many[171] 1891/1892
H. rudolfensis
membership in Homo uncertain 1,900 Kenya 700 2 sites 1972/1986
H. gautengensis
also classified as H. habilis 1,900 – 600 South Africa 100 cm (3 ft 3 in) 3 individuals[172] 2010/2010
H. ergaster
also classified as H. erectus 1,800 – 1,300[173] Eastern and Southern Africa 700–850 Many 1949/1975
H. antecessor
also classified as H. heidelbergensis 1,200 – 800 Spain 175 cm (5 ft 9 in) 90 kg (200 lb) 1,000 2 sites 1994/1997
H. cepranensis
a single fossil, possibly H. erectus 900 – 350 Italy 1,000 1 skull cap 1994/2003
H. heidelbergensis 600 – 300[174] Europe, Africa, China 180 cm (5 ft 11 in) 90 kg (200 lb) 1,100–1,400 Many 1907/1908
H. neanderthalensis
possibly a subspecies of H. sapiens 350 – 40[175] Europe, Western Asia 170 cm (5 ft 7 in) 55–70 kg (121–154 lb) (heavily built) 1,200–1,900 Many 1829/1864
H. naledi
335–236 South Africa 150 centimetres (4 ft 11 in) tall 45 kilograms (99 lb) 450 15 individuals 2013/2015
H. tsaichangensis
possibly H. erectus 190 – 10[176] Taiwan 1 individual 2008(?)/2015
H. rhodesiensis
also classified as H. heidelbergensis 300 – 120 Zambia 1,300 Very few 1921/1921
H. sapiens
(anatomically modern humans) 200[177] – present Worldwide 150 - 190 cm (4 ft 7 in - 6 ft 3 in) 50–100 kg (110–220 lb) 950–1,800 (extant) —/1758
H. floresiensis
classification uncertain 190 – 50 Indonesia 100 cm (3 ft 3 in) 25 kg (55 lb) 400 7 individuals 2003/2004
Denisova hominin
possible H. sapiens subspecies or hybrid 40 Russia 1 site 2000/2010[178]
Red Deer Cave people
possible H. sapiens subspecies or hybrid 14.5–11.5 China Very few 2012/—

Hominin species distributed through time edit

Use of tools[edit]
"A sharp rock", an Oldowan pebble tool, the most basic of human stone tools.
The harnessing of fire was a pivotal milestone in human history.
Acheulean hand-axes from Kent. Homo erectus flint work. The types shown are (clockwise from top) cordate, ficron and ovate.
Venus of Willendorf, an example of Paleolithic art, dated 24–26,000 years ago.
See also: Hunting hypothesis
The use of tools has been interpreted as a sign of intelligence, and it has been theorized that tool use may have stimulated certain aspects of human evolution, especially the continued expansion of the human brain.[179] Paleontology has yet to explain the expansion of this organ over millions of years despite being extremely demanding in terms of energy consumption. The brain of a modern human consumes about 13 watts (260 kilocalories per day), a fifth of the body's resting power consumption.[180] Increased tool use would allow hunting for energy-rich meat products, and would enable processing more energy-rich plant products. Researchers have suggested that early hominins were thus under evolutionary pressure to increase their capacity to create and use tools.[181]
Precisely when early humans started to use tools is difficult to determine, because the more primitive these tools are (for example, sharp-edged stones) the more difficult it is to decide whether they are natural objects or human artifacts.[179] There is some evidence that the australopithecines (4 Ma) may have used broken bones as tools, but this is debated.[182]
It should be noted that many species make and use tools, but it is the human genus that dominates the areas of making and using more complex tools. The oldest known tools are the Oldowan stone tools from Ethiopia, 2.5–2.6 million years old. A Homo fossil was found near some Oldowan tools, and its age was noted at 2.3 million years old, suggesting that maybe the Homo species did indeed create and use these tools. It is a possibility but does not yet represent solid evidence.[183] The third metacarpal styloid process enables the hand bone to lock into the wrist bones, allowing for greater amounts of pressure to be applied to the wrist and hand from a grasping thumb and fingers. It allows humans the dexterity and strength to make and use complex tools. This unique anatomical feature separates humans from apes and other nonhuman primates, and is not seen in human fossils older than 1.8 million years.[184]
Bernard Wood noted that Paranthropus co-existed with the early Homo species in the area of the "Oldowan Industrial Complex" over roughly the same span of time. Although there is no direct evidence which identifies Paranthropus as the tool makers, their anatomy lends to indirect evidence of their capabilities in this area. Most paleoanthropologists agree that the early Homo species were indeed responsible for most of the Oldowan tools found. They argue that when most of the Oldowan tools were found in association with human fossils, Homo was always present, but Paranthropus was not.[183]
In 1994, Randall Susman used the anatomy of opposable thumbs as the basis for his argument that both the Homo and Paranthropus species were toolmakers. He compared bones and muscles of human and chimpanzee thumbs, finding that humans have 3 muscles which are lacking in chimpanzees. Humans also have thicker metacarpals with broader heads, allowing more precise grasping than the chimpanzee hand can perform. Susman posited that modern anatomy of the human opposable thumb is an evolutionary response to the requirements associated with making and handling tools and that both species were indeed toolmakers.[183]
Stone tools[edit]
Main article: Stone tool
Stone tools are first attested around 2.6 Million years ago, when H. habilis in Eastern Africa used so-called pebble tools, choppers made out of round pebbles that had been split by simple strikes.[185] This marks the beginning of the Paleolithic, or Old Stone Age; its end is taken to be the end of the last Ice Age, around 10,000 years ago. The Paleolithic is subdivided into the Lower Paleolithic (Early Stone Age), ending around 350,000–300,000 years ago, the Middle Paleolithic (Middle Stone Age), until 50,000–30,000 years ago, and the Upper Paleolithic, (Late Stone Age), 50,000-10,000 years ago.
Archaeologists working in the Great Rift Valley in Kenya claim to have discovered the oldest known stone tools in the world. Dated to around 3.3 million years ago, the implements are some 700,000 years older than stone tools from Ethiopia that previously held this distinction.[186][187][188]
The period from 700,000–300,000 years ago is also known as the Acheulean, when H. ergaster (or erectus) made large stone hand axes out of flint and quartzite, at first quite rough (Early Acheulian), later "retouched" by additional, more-subtle strikes at the sides of the flakes. After 350,000 BP the more refined so-called Levallois technique was developed, a series of consecutive strikes, by which scrapers, slicers ("racloirs"), needles, and flattened needles were made.[185] Finally, after about 50,000 BP, ever more refined and specialized flint tools were made by the Neanderthals and the immigrant Cro-Magnons (knives, blades, skimmers). In this period they also started to make tools out of bone.
Transition to behavioral modernity[edit]
Further information: Behavioral modernity
Until about 50,000–40,000 years ago, the use of stone tools seems to have progressed stepwise. Each phase (H. habilis, H. ergaster, H. neanderthalensis) started at a higher level than the previous one, but after each phase started, further development was slow. Currently paleoanthropologists are debating whether these Homo species possessed some or many of the cultural and behavioral traits associated with modern humans such as language, complex symbolic thinking, technological creativity etc. It seems that they were culturally conservative maintaining simple technologies and foraging patterns over very long periods.
Around 50,000 BP, modern human culture started to evolve more rapidly. The transition to behavioral modernity has been characterized by most as a Eurasian "Great Leap Forward",[189] or as the "Upper Palaeolithic Revolution",[190] due to the sudden appearance of distinctive signs of modern behavior and big game hunting[191] in the archaeological record. Some other scholars consider the transition to have been more gradual, noting that some features had already appeared among archaic African Homo sapiens since 200,000 years ago.[192][193] Recent evidence suggests that the Australian Aboriginal population separated from the African population 75,000 years ago, and that they made a sea journey of up to 160 km 60,000 years ago, which may diminish the evidence of the Upper Paleolithic Revolution.[194]
Modern humans started burying their dead, using animal hides to make clothing, hunting with more sophisticated techniques (such as using trapping pits or driving animals off cliffs), and engaging in cave painting.[195] As human culture advanced, different populations of humans introduced novelty to existing technologies: artifacts such as fish hooks, buttons, and bone needles show signs of variation among different populations of humans, something that had not been seen in human cultures prior to 50,000 BP. Typically, H. neanderthalensis populations do not vary in their technologies, although the Chatelperronian assemblages have been found to be Neanderthal innovations produced as a result of exposure to the Homo sapiens Aurignacian technologies.[196]
Among concrete examples of modern human behavior, anthropologists include specialization of tools, use of jewellery and images (such as cave drawings), organization of living space, rituals (for example, burials with grave gifts), specialized hunting techniques, exploration of less hospitable geographical areas, and barter trade networks. Debate continues as to whether a "revolution" led to modern humans ("the big bang of human consciousness"), or whether the evolution was more "gradual".[120]
Recent and current human evolution[edit]
Evolution has continued in anatomically modern human populations, which are affected by both natural selection and genetic drift. Although selection pressure on some traits, such as resistance to smallpox, has decreased in modern human life, humans are still undergoing natural selection for many other traits. Some of these are due to specific environmental pressures, while others are related to lifestyle changes since the development of agriculture (10,000 years ago), urban civilization (5,000), and industrialization (250 years ago). It has been argued that human evolution has accelerated since the development of agriculture 10,000 years ago and civilization some 5,000 years ago, resulting, it is claimed, in substantial genetic differences between different current human populations.[197]
Particularly conspicuous is variation in superficial characteristics, such as Afro-textured hair, or the recent evolution of light skin and blond hair in some populations, which are attributed to differences in climate. Particularly strong selective pressures have resulted in high-altitude adaptation in humans, with different ones in different isolated populations. Studies of the genetic basis show that some developed very recently, with Tibetans evolving over 3,000 years to have high proportions of an allele of EPAS1 that is adaptive to high altitudes.
Other evolution is related to endemic diseases: the presence of malaria selected for sickle cell trait (the heterozygote form of sickle cell gene), while the absence of malaria and the health effects of sickle-cell anemia select against this trait. For example, the population at risk of the severe debilitating disease kuru has significant over-representation of an immune variant of the prion protein gene G127V versus non-immune alleles. The frequency of this genetic variant is due to the survival of immune persons.[198][199]
Recent human evolution related to agriculture includes genetic resistance to infectious disease that has appeared in human populations by crossing the species barrier from domesticated animals,[200] as well as changes in metabolism due to changes in diet, such as lactase persistence.
In contemporary times, since industrialization, some trends have been observed: for instance, menopause is evolving to occur later.[201] Other reported trends appear to include lengthening of the human reproductive period and reduction in cholesterol levels, blood glucose and blood pressure in some populations.[201]
Species list[edit]
This list is in chronological order across the table by genus. Some species/subspecies names are well-established, and some are less established – especially in genus Homo. Please see articles for more information.
Sahelanthropus
Homo (human)
S. tchadensis H. gautengensis
Orrorin
H. habilis
O. tugenensis H. rudolfensis
Ardipithecus
H. floresiensis
A. kadabba H. ergaster
A. ramidus H. erectus
Australopithecus
• H. e. georgicus
A. anamensis H. cepranensis
A. afarensis H. antecessor
A. bahrelghazali H. heidelbergensis
A. africanus H. rhodesiensis
A. garhi H. naledi
A. sediba H. helmei
Kenyanthropus
H. neanderthalensis
K. platyops H. sapiens
Paranthropus
• H. s. idaltu
P. aethiopicus • H. s. sapiens (early)
P. boisei • H. s. sapiens (modern)
P. robustus
See also[edit]
Adaptive evolution in the human genome
Amity-enmity complex
The Ancestor's Tale
Archaeogenetics
Chimpanzee–human last common ancestor
Dawn of Humanity (2015 PBS documentary)
Dual inheritance theory
Dysgenics
Evolution of hair
Evolution of human intelligence
Evolution of morality
Evolutionary anthropology
Evolutionary medicine
Evolutionary neuroscience
Evolutionary origin of religions
Evolutionary psychology
Hominidae
Human behavioral ecology
Human evolution (origins of society and culture)
Human skeletal changes due to bipedalism
Human vestigiality
List of human evolution fossils
March of Progress
Molecular paleontology
Noogenesis
Origin of language
Origin of speech
Obstetrical dilemma
Prehistoric Autopsy (2012 BBC documentary)
Prehistory
Recent African origin of modern humans
Sahara pump theory
Sexual selection in human evolution
The Fate of the Earth
The Human Zoo
The Naked Ape
Timeline of human evolution
Human origins
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Jump up ^ Schrenk, Friedemann; Kullmer, Ottmar; Bromage, Timothy (2007). "The Earliest Putative Homo Fossils". In Henke, Winfried; Tattersall, Ian. Handbook of Paleoanthropology. 1. In collaboration with Thorolf Hardt. Berlin, Heidelberg: Springer. pp. 1611–1631. doi:10.1007/978-3-540-33761-4_52. ISBN 978-3-540-32474-4. Confirmed H. habilis fossils are dated to between 2.1 and 1.5 million years ago. This date range overlaps with the emergence of Homo erectus. Wilford, John Noble (August 9, 2007). "Fossils in Kenya Challenge Linear Evolution". The New York Times. Retrieved 2015-05-04.
DiMaggio, Erin N.; Campisano, Christopher J.; Rowan, John; et al. (March 20, 2015). "Late Pliocene fossiliferous sedimentary record and the environmental context of early Homo from Afar, Ethiopia". Science. Washington, D.C.: American Association for the Advancement of Science. 347 (6228): 1355–1359. doi:10.1126/science.aaa1415. ISSN 0036-8075. PMID 25739409. Hominins with "proto-Homo" traits may have lived as early as 2.8 million years ago, as suggested by a fossil jawbone classified as transitional between Australopithecus and Homo discovered in 2015.
Jump up ^ Haviland, William A.; Walrath, Dana; Prins, Harald E. L.; McBride, Bunny (2007). Evolution and Prehistory: The Human Challenge (8th ed.). Belmont, CA: Thomson Wadsworth. p. 162. ISBN 978-0-495-38190-7. H. erectus may have appeared some 2 million years ago. Fossils dated to as much as 1.8 million years ago have been found both in Africa and in Southeast Asia, and the oldest fossils by a narrow margin (1.85 to 1.77 million years ago) were found in the Caucasus, so that it is unclear whether H. erectus emerged in Africa and migrated to Eurasia, or if, conversely, it evolved in Eurasia and migrated back to Africa.
Ferring, R.; Oms, O.; Agusti, J.; Berna, F.; Nioradze, M.; Shelia, T.; Tappen, M.; Vekua, A.; Zhvania, D.; Lordkipanidze, D. (2011). "Earliest human occupations at Dmanisi (Georgian Caucasus) dated to 1.85-1.78 Ma". Proceedings of the National Academy of Sciences. 108 (26): 10432. doi:10.1073/pnas.1106638108. PMC 3127884  . PMID 21646521.
"New discovery suggests Homo erectus originated from Asia". Daily News and Analysis. Mumbai, India: Diligent Media Corporation Ltd. Asian News International. June 8, 2011. Retrieved 2015-05-04.
Frazier, Kendrick (November–December 2006). "Leakey Fights Church Campaign to Downgrade Kenya Museum's Human Fossils". Skeptical Inquirer. Amherst, NY: Committee for Skeptical Inquiry. 30 (6). ISSN 0194-6730. Retrieved 2015-05-04.
Jump up ^ Now also included in H. erectus are Peking Man (formerly Sinanthropus pekinensis) and Java Man (formerly Pithecanthropus erectus). H. erectus is now grouped into various subspecies, including Homo erectus erectus, Homo erectus yuanmouensis, Homo erectus lantianensis, Homo erectus nankinensis, Homo erectus pekinensis, Homo erectus palaeojavanicus, Homo erectus soloensis, Homo erectus tautavelensis, Homo erectus georgicus. The distinction from descendant species such as Homo ergaster, Homo floresiensis, Homo antecessor, Homo heidelbergensis and indeed Homo sapiens is not entirely clear.
Jump up ^ Curnoe, Darren (June 2010). "A review of early Homo in southern Africa focusing on cranial, mandibular and dental remains, with the description of a new species (Homo gautengensis sp. nov.)". HOMO - Journal of Comparative Human Biology. Amsterdam, the Netherlands: Elsevier. 61 (3): 151–177. doi:10.1016/j.jchb.2010.04.002. ISSN 0018-442X. PMID 20466364. A species proposed in 2010 based on the fossil remains of three individuals dated between 1.9 and 0.6 million years ago. The same fossils were also classified as H. habilis, H. ergaster or Australopithecus by other anthropologists.
Jump up ^ Hazarika, Manjil (2007). "Homo erectus/ergaster and Out of Africa: Recent Developments in Paleoanthropology and Prehistoric Archaeology" (PDF). EAA Summer School eBook. 1. European Anthropological Association. pp. 35–41. Retrieved 2015-05-04. "Intensive Course in Biological Anthrpology, 1st Summer School of the European Anthropological Association, 16–30 June, 2007, Prague, Czech Republic"
Jump up ^ The type fossil is Mauer 1, dated to ca. 0.6 million years ago. The transition from H. heidelbergensis to H. neanderthalensis between 300 and 243 thousand years ago is conventional, and makes use of the fact that there is no known fossil in this period. Examples of H. heidelbergensis are fossils found at Bilzingsleben (also classified as Homo erectus bilzingslebensis).
Jump up ^ Bischoff, James L.; Shamp, Donald D.; Aramburu, Arantza; et al. (March 2003). "The Sima de los Huesos Hominids Date to Beyond U/Th Equilibrium (>350 kyr) and Perhaps to 400–500 kyr: New Radiometric Dates". Journal of Archaeological Science. Amsterdam, the Netherlands: Elsevier. 30 (3): 275–280. doi:10.1006/jasc.2002.0834. ISSN 0305-4403. The first humans with "proto-Neanderthal traits" lived in Eurasia as early as 0.6 to 0.35 million years ago (classified as H. heidelbergensis, also called a chronospecies because it represents a chronological grouping rather than being based on clear morphological distinctions from either H. erectus or H. neanderthalensis), with the first "true Neanderthals" appearing between 0.25 and 0.2 million years ago.
Papagianni, Dmitra; Morse, Michael A. (2013). The Neanderthals Rediscovered: How Modern Science is Rewriting Their Story. New York: Thames & Hudson. ISBN 978-0-500-05177-1.
Jump up ^ Chang, Chun-Hsiang; Kaifu, Yousuke; Takai, Masanaru; Kono, Reiko T.; Grün, Rainer; Matsu’ura, Shuji; Kinsley, Les; Lin, Liang-Kong (2015). "The first archaic Homo from Taiwan". Nature Communications. 6: 6037. doi:10.1038/ncomms7037. PMC 4316746  . PMID 25625212.
Jump up ^ The age of H. sapiens has long been assumed to be close to 200,000 years, but since 2017 there have been a number of suggestions extending this time to has high as 300,000 years. In 2017, fossils found in Jebel Irhoud (Morocco) suggest that Homo sapiens may have speciated by as early as 315,000 years ago. Callaway, Ewan (7 June 2017). "Oldest Homo sapiens fossil claim rewrites our species' history". Nature. doi:10.1038/nature.2017.22114. Retrieved 11 June 2017. Genetic evidence has been adduced for an age of roughly 270,000 years. Posth, Cosimo; et al. (4 July 2017). "Deeply divergent archaic mitochondrial genome provides lower time boundary for African gene flow into Neanderthals". Nature Communications. doi:10.1038/ncomms16046. Retrieved 4 July 2017. CS1 maint: Explicit use of et al. (link)
Jump up ^ provisional names Homo sp. Altai or Homo sapiens ssp. Denisova.
^ Jump up to: a b Ko, Kwang Hyun (2016). "Origins of human intelligence: The chain of tool-making and brain evolution" (PDF). Anthropological Notebooks. 22 (1): 5–22.
Jump up ^ Jabr, Ferris (July 18, 2012). "Does Thinking Really Hard Burn More Calories?". Scientific American. Stuttgart: Georg von Holtzbrinck Publishing Group. ISSN 0036-8733. Retrieved 2015-05-03.
Jump up ^ Gibbons, Ann (May 29, 1998). "Solving the Brain's Energy Crisis". Science. Washington, D.C.: American Association for the Advancement of Science. 280 (5368): 1345–1347. doi:10.1126/science.280.5368.1345. ISSN 0036-8075. PMID 9634409.
Jump up ^ Robinson 2008, p. 398
^ Jump up to: a b c Freeman & Herron 2007, pp. 786–788
Jump up ^ Ward, Carol V.; Tocheri, Matthew W.; Plavcan, J. Michael; et al. (January 7, 2014). "Early Pleistocene third metacarpal from Kenya and the evolution of modern human-like hand morphology". Proc. Natl. Acad. Sci. U.S.A. Washington, D.C.: National Academy of Sciences. 111 (1): 121–124. doi:10.1073/pnas.1316014110. ISSN 0027-8424. PMC 3890866  . PMID 24344276.
^ Jump up to: a b Plummer, Thomas (2004). "Flaked stones and old bones: Biological and cultural evolution at the dawn of technology". American Journal of Physical Anthropology. Hoboken, NJ: John Wiley & Sons for the American Association of Physical Anthropologists. Supplement 39 (Yearbook of Physical Anthropology): 118–164. doi:10.1002/ajpa.20157. ISSN 0002-9483. PMID 15605391.
Jump up ^ Wong, Kate (April 15, 2015). "Archaeologists Take Wrong Turn, Find World's Oldest Stone Tools". Scientific American (Blog). Stuttgart: Georg von Holtzbrinck Publishing Group. ISSN 0036-8733. Retrieved 2015-05-03.
Jump up ^ Balter, Michael (April 14, 2015). "World's oldest stone tools discovered in Kenya". Science (News). Washington, D.C.: American Association for the Advancement of Science. doi:10.1126/science.aab2487. ISSN 0036-8075. Retrieved 2015-05-03.
Jump up ^ Drake, Nadia (April 16, 2015). "Oldest Stone Tools Discovered in Kenya". National Geographic News. Washington, D.C.: National Geographic Society. Retrieved 2015-05-03.
Jump up ^ Diamond 1999, p. 39
Jump up ^ Bar-Yosef, Ofer (October 2002). "The Upper Paleolithic Revolution". Annual Review of Anthropology. Palo Alto, CA: Annual Reviews. 31: 363–393. doi:10.1146/annurev.anthro.31.040402.085416. ISSN 0084-6570.
Jump up ^ Oppenheimer, Stephen (2012) "Out of Eden: the peopling of the world" (Robinson)
Jump up ^ Nowell, April (October 2010). "Defining Behavioral Modernity in the Context of Neandertal and Anatomically Modern Human Populations". Annual Review of Anthropology. Palo Alto, CA: Annual Reviews. 39: 437–452. doi:10.1146/annurev.anthro.012809.105113. ISSN 0084-6570.
Jump up ^ d'Errico, Francesco; Stringer, Chris B. (April 12, 2011). "Evolution, revolution or saltation scenario for the emergence of modern cultures?". Philosophical Transactions of the Royal Society B. London: Royal Society. 366 (1567): 1060–1069. doi:10.1098/rstb.2010.0340. ISSN 0962-8436. PMC 3049097  . PMID 21357228.
Jump up ^ Rasmussen, Morten; et al. (2011). "An Aboriginal Australian Genome Reveals Separate Human Dispersals into Asia". Science. 334 (6052): 94–98. doi:10.1126/science.1211177).
Jump up ^ Ambrose, Stanley H. (March 2, 2001). "Paleolithic Technology and Human Evolution". Science. Washington, D.C.: American Association for the Advancement of Science. 291 (5509): 1748–1753. Bibcode:2001Sci...291.1748A. doi:10.1126/science.1059487. ISSN 0036-8075. PMID 11249821.
Jump up ^ Mellars, P (2010). "Neanderthal symbolism and ornament manufacture: The bursting of a bubble?". Proc Natl Acad Sci U S A. 107: 20147–20148. doi:10.1073/pnas.1014588107. PMC 2996706  . PMID 21078972.
Jump up ^ Cochran & Harpending 2009
Jump up ^ Medical Research Council (UK) (November 21, 2009). "Brain Disease 'Resistance Gene' evolves in Papua New Guinea community; could offer insights Into CJD". ScienceDaily. Rockville, MD: ScienceDaily, LLC. Retrieved 2009-11-22.
Jump up ^ Mead, S.; Whitfield, J.; Poulter, M.; Shah, P.; Uphill, J.; Campbell, T.; Al-Dujaily, H.; Hummerich, H.; Beck, J.; Mein, C. A.; Verzilli, C.; Whittaker, J.; Alpers, M. P.; Collinge, J. (2009). "A Novel Protective Prion Protein Variant that Colocalizes with Kuru Exposure". The New England Journal of Medicine. 361 (21): 2056–2065. doi:10.1056/NEJMoa0809716. PMID 19923577.
Jump up ^ Diamond 1999
^ Jump up to: a b Byars, S. G.; Ewbank, D.; Govindaraju, D. R.; Stearns, S. C. (2009). "Natural selection in a contemporary human population". Proceedings of the National Academy of Sciences. 107 (suppl_1): 1787–1792. Bibcode:2010PNAS..107.1787B. doi:10.1073/pnas.0906199106. PMC 2868295  . PMID 19858476.
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Further reading[edit]
Alexander, Richard D. (1990). How Did Humans Evolve? Reflections on the Uniquely Unique Species (PDF). Special Publication. Ann Arbor, MI: Museum of Zoology, University of Michigan. pp. 1–38. LCCN 90623893. OCLC 22860997.
Barton, Nicholas H.; Briggs, Derek E. G.; Eisen, Jonathan A.; et al. (2007). Evolution. Cold Spring Harbor, NY: Cold Spring Harbor Laboratory Press. ISBN 978-0-87969-684-9. LCCN 2007010767. OCLC 86090399.
Enard, Wolfgang; Przeworski, Molly; Fisher, Simon E.; et al. (August 22, 2002). "Molecular evolution of FOXP2, a gene involved in speech and language". Nature. London: Nature Publishing Group. 418 (6900): 869–872. doi:10.1038/nature01025. ISSN 0028-0836. PMID 12192408.
Flinn, Mark V.; Geary, David C.; Ward, Carol V. (January 2005). "Ecological dominance, social competition, and coalitionary arms races: Why humans evolved extraordinary intelligence" (PDF). Evolution and Human Behavior. Amsterdam, the Netherlands: Elsevier. 26 (1): 10–46. doi:10.1016/j.evolhumbehav.2004.08.005. ISSN 1090-5138. Retrieved 2015-05-05.
Gibbons, Ann (2006). The First Human: The Race to Discover our Earliest Ancestors (1st ed.). New York: Doubleday. ISBN 978-0-385-51226-8. LCCN 2005053780. OCLC 61652817.
Hartwig, Walter C., ed. (2002). The Primate Fossil Record. Cambridge Studies in Biological and Evolutionary Anthropology. 33. Cambridge; New York: Cambridge University Press. ISBN 0-521-66315-6. LCCN 2001037847. OCLC 47254191.
Heizmann, Elmar P. J.; Begun, David R. (November 2001). "The oldest Eurasian hominoid". Journal of Human Evolution. Amsterdam, the Netherlands: Elsevier. 41 (5): 463–481. doi:10.1006/jhev.2001.0495. ISSN 0047-2484. PMID 11681862.
Hill, Andrew; Ward, Steven (1988). "Origin of the hominidae: The record of African large hominoid evolution between 14 my and 4 my". American Journal of Physical Anthropology. Hoboken, NJ: John Wiley & Sons for the American Association of Physical Anthropologists. 31 (59): 49–83. doi:10.1002/ajpa.1330310505. ISSN 0002-9483.
Hoagland, Hudson (1964). "Science and the New Humanism". Science. 143: 111–114. doi:10.1126/science.143.3602.111.
Ijdo, Jacob W.; Baldini, Antonio; Ward, David C.; et al. (October 15, 1991). "Origin of human chromosome 2: An ancestral telomere-telomere fusion" (PDF). Proc. Natl. Acad. Sci. U.S.A. Washington, D.C.: National Academy of Sciences. 88 (20): 9051–9055. Bibcode:1991PNAS...88.9051I. doi:10.1073/pnas.88.20.9051. ISSN 0027-8424. PMC 52649  . PMID 1924367. Retrieved 2015-05-05. — two ancestral ape chromosomes fused to give rise to human chromosome 2
Johanson, Donald; Wong, Kate (2010). Lucy's Legacy: The Quest for Human Origins. New York: Three Rivers Press. ISBN 978-0-307-39640-2. LCCN 2010483830. OCLC 419801728.
Jones, Steve; Martin, Robert D.; Pilbeam, David, eds. (1994) [First published 1992]. The Cambridge Encyclopedia of Human Evolution. Foreword by Richard Dawkins (1st paperback ed.). Cambridge, UK: Cambridge University Press. ISBN 0-521-32370-3. LCCN 92018037. OCLC 444512451. (Note: this book contains very useful, information dense chapters on primate evolution in general, and human evolution in particular, including fossil history).
Leakey, Richard E.; Lewin, Roger (1992). Origins Reconsidered: In Search of What Makes us Human. New York: Doubleday. ISBN 0-385-41264-9. LCCN 92006661. OCLC 25373161.
Lewin, Roger (1997). Bones of Contention: Controversies in the Search for Human Origins (2nd ed.). Chicago, Illinois: University of Chicago Press. ISBN 0-226-47651-0. LCCN 97000972. OCLC 36181117.
Morwood, Mike; van Oosterzee, Penny (2007). A New Human: The Startling Discovery and Strange Story of the 'Hobbits' of Flores, Indonesia (1st Smithsonian Books ed.). New York: Smithsonian Books/HarperCollins. ISBN 978-0-06-089908-0. LCCN 2006052267. OCLC 76481584.
Oppenheimer, Stephen (2003). Out of Eden: The Peopling of the World. london: Constable & Robinson. ISBN 1-84119-697-5. LCCN 2005482222. OCLC 52195607.
Ovchinnikov, Igor V.; Götherström, Anders; Romanova, Galina P.; et al. (March 30, 2000). "Molecular analysis of Neanderthal DNA from the Northern Caucasus". Nature. London: Nature Publishing Group. 404 (6777): 490–493. doi:10.1038/35006625. ISSN 0028-0836. PMID 10761915.
Roberts, Alice M. (2009). The Incredible Human Journey: The Story of How We Colonised the Planet. London: Bloomsbury Publishing. ISBN 978-0-7475-9839-8. OCLC 310156315.
Shreeve, James (1995). The Neandertal Enigma: Solving the Mystery of Modern Human Origins. New York: Morrow. ISBN 0-688-09407-4. LCCN 95006337. OCLC 32088673.
Stringer, Chris B. (2011). The Origin of Our Species. London: Allen Lane. ISBN 978-1-84614-140-9. LCCN 2011489742. OCLC 689522193.
Stringer, Chris B.; Andrews, Peter (2005). The Complete World of Human Evolution. London; New York: Thames & Hudson. ISBN 0-500-05132-1. LCCN 2004110563. OCLC 224377190.
Stringer, Christopher; McKie, Robin (1997). African Exodus: The Origins of Modern Humanity (1st American ed.). New York: Henry Holt and Company. ISBN 0-8050-2759-9. LCCN 96037718. OCLC 36001167.
Tattersall, Ian (2008). The Fossil Trail: How We Know What We Think We Know About Human Evolution (2nd ed.). New York: Oxford University. ISBN 978-0195367669. LCCN 2008013654. OCLC 218188644.
van Oosterzee, Penny (1999). Dragon Bones: The Story of Peking Man. St Leonards, New South Wales: Allen & Unwin. ISBN 1-86508-123-X. LCCN 00300421. OCLC 45853997.
Wade, Nicholas (2006). Before the Dawn: Recovering the Lost History of Our Ancestors. New York: Penguin Press. ISBN 1-59420-079-3. LCCN 2005055293. OCLC 62282400.
Walker, Alan; Shipman, Pat (1996). The Wisdom of the Bones: In Search of Human Origins. London: Weidenfeld & Nicolson. ISBN 0-297-81670-5. OCLC 35202130.
Weiss, Mark L.; Mann, Alan E. (1985). Human Biology and Behavior: An Anthropological Perspective (4th ed.). Boston: Little Brown. ISBN 0-316-92894-1. LCCN 85000158. OCLC 11726796. (Note: this book contains very accessible descriptions of human and non-human primates, their evolution, and fossil history).
Wells, Spencer (2003) [Originally published 2002; Princeton, NJ: Princeton University Press]. The Journey of Man: A Genetic Odyssey (Random House trade paperback ed.). New York: Random House Trade Paperbacks. ISBN 0-8129-7146-9. LCCN 2003066679. OCLC 53287806.
External links[edit]
Wikimedia Commons has media related to Human evolution.
"BBC - Science & Nature - The evolution of man". BBC. Retrieved 2015-05-06.
"Becoming Human". Arizona State University's Institute of Human Origins. Retrieved 2015-05-06.
"Bones, Stones and Genes: The Origin of Modern Humans" (Video lecture series). Howard Hughes Medical Institute. Retrieved 2015-05-06.
"Evolution Figures: Chapter 25". Cold Spring Harbor Laboratory Press. Retrieved 2015-05-06. — Illustrations from the book Evolution (2007)
"Human Evolution". Smithsonian Institution's Human Origins Program. Retrieved 2013-06-24.
"Human Evolution Timeline". ArchaeologyInfo.com. Retrieved 2013-06-24.
"Human Trace" video 2015 Normandy University UNIHAVRE, CNRS, IDEES, E.Laboratory on Human Trace Unitwin Complex System Digital Campus UNESCO.
Lambert, Tim (Producer) (June 24, 2015). First Peoples. London: Wall to Wall Television. OCLC 910115743. Retrieved 2015-07-18.
Shaping Humanity Video 2013 Yale University
Human Timeline (Interactive) – Smithsonian, National Museum of Natural History (August 2016).
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The Adapted Mind
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