In primitive forms, the two clavicles and the interclavicle could have grown ventrally in such a way as to form a broad chest plate, although such was not the case in Eryops.
I primitiva former kunde de båda nyckelbenen och interclavicle ha vuxit ventralt på ett sådant sätt att de bildar en bred bröstplatta, fastän så inte var fallet med Eryops.