BIOL 103 Chapter Notes - Chapter 19.9-19.17: Thumb, Depth Perception, Homo Erectus
1 Oct 2016
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19. 9 primates include lemurs, tarsiers, monkeys, and apes. Most living primates are arboreal, and the primate body has a number of features that were shaped, through natural selection, but the demands of living in trees. Anthropoids (monkey and apes: fully opposable thumbs. Lemurs and lorises: short snout; eyes set close together on front of face. Enhances depth perception: limber shoulder and hip joints. Enable climbing and swinging from branch to branch: five highly mobile digits on hands and feet. Grasp objects and manipulate food: flexible thumb. Tarsiers: small, nocturnal tree-dwellers, flat faces and large eyes. Forelimbs that are about equal in length to their hind limbs: new world monkeys. Long prehensile (grasping) tail: old world monkeys. Lack a tails and most have long arms and short legs. Larger brains relative to body size and flexible behavior: gibbons. Smallest, lightest, and most acrobatic: orangutans. Shy and live in the rain forest of sumatra and borneo.
