280 likes | 638 Views
Hominid Evolution. Primate Classification. When did we split from other Primates?. Primates. ~25 million years ago: Old World Monkeys split from Hominoids , a linage that resulted in humans, gorillas and chimps
E N D
Hominid Evolution Primate Classification
Primates • ~25 million years ago: Old World Monkeys split from Hominoids, a linage that resulted in humans, gorillas and chimps • ~17 million years ago: Great apes (Hominidae) including orang-utans, gorillas and humans, branched off from the lesser apes, which includes gibbons • ~10 million years ago: Organ-utans branched off within the Hominidae linage • ~5 million years ago: Hominids, including Homo sapiens, branched off from Chimpanzees
Features Common to All New World Monkeys • Prehensile tail that can be used as a 5th limb • Quadrupedal • Strictly tree dwelling (arboreal) • Widely separated nostrils
Features Common to All Old World Monkeys • Tail is not prehensile • Quadrupedal • Some are ground dwelling • Nostrils are close together and open downwards
Features Common to All Hominoids • No tail • Semi-erect or fully erect posture • Broad chest, pelvis and shoulders • Relatively long arms and mobile shoulder joints • Larger brain
Features Common to All Apes • Some brachiating (swinging underneath from branch to branch) • Some mainly ground dwelling and quadrupedal • Flattened nose • Bony eye ridges
Features of Hominids • Bipedal • Large forebrain (cerebral cortex) • Reduced teeth in general, particularly canines • Possessed to varying degrees • Nose and chin are prominent • Reduced eye ridges • Highly sensitive skin* • Body hair very reduced to assist cooling * • Complex social behaviour * Assumed
GAME: Name That Primate Group • Name the primate group that the organism pictured belongs to • New World Monkeys • Old World Monkeys • Apes • Hominids • Give one example of a feature of this group