BIO 200 Lecture Notes - Lecture 24: Old World Monkey, Homo Habilis, Haplorhini
13 Nov 2016
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The primate lineages: what makes a primate, the primate tree, strepsirrhini and haplorrhini, platyrrhini and catarrhini, hominoids, how are hominins different from the rest of the hominoidea. Key terms/outline: two primate trait, grasping hands (opposable thumbs) Allows us to grip, hang, and swing from branches. Opposable thumb folds across instead of down to help with grabbing. Nails instead of claws: binocular vision. Longer time for learning and brain development: platyrrhini (new world monkey) Hominids (great apes and humans: old world monkeys. Tough skin pads on butt for sitting. Tail less: hominoids (gibbons, great apes, humans) Asian apes (gibbons and orangutans) branched from other hominoids in 2 separate events. African apes and humans evolved most recently. Very closely related to chimps: hominins. Bipedal (walk on 2 legs, upright: differentiating humans and apes. Humans are bipedal, curved spine that comes from base of skull, broader pelvis (center of gravity over legs) Straighter spine that comes from back of skull: bipedalism.
