ANP 325 Intro - What is a Primate? Thursday, February 03,...

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Lecture Topic: Placental Mammal Petrosal Bulla, all mammals have an auditory bulla, no functional purpose Relatively large brain size (neocortex expansion) Reduced Olfaction Forward-facing stereoscopic vision Disadvantages of blind spot, behind us, but depth perception Post-orbital Bar Increased density of photo receptors, color vision Relatively larger Visual Cortex, high visual acuity What defines a primate? Horizontal vs. Vertical lines At one point the photoreceptor cannot tell the difference With increased acuity, reduced olfactory senses, shortened rostrum/snout How is visual acuity tested in Primates? Most primates have divergent, out of line of other digits Opposable is the ability to touch other digits with thumb and precision At least one nail, divergence = grasping, some have reevolved "claws" Spider Monkeys, Mariqui, Gibbons, Siamangs almost have lost thumbs, bone is still present but not a separate digit, brachiating
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ANP 325 Intro - What is a Primate? Thursday, February 03,...

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