ANTH 1 Lecture Notes - Lecture 16: Folivore, Rhinarium, Frugivore
13 Oct 2020
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Dermal ridges (finger/toe prints) increase friction, enhance tactile sense. Primitive dermal ridges in strepsirhines (lemur, loris) + tarsiers. Eyes in front = visual fields overlap. Depth perception needed for moving between trees. Post-orbital bar or plate behind the eye orbits. Smaller and less projecting snouts reduces surface area for smelling. Can eat a wide range of foods. Diverse tooth types allows primates to eat a wide range of foods. Dental formula of early mammalian primate ancestor: 3: 4. 3 (3 incisors, 1 canine, 4 premolars, 3 molars in each quadrant. (# of upper/lower) incisors: canines: premolars: molars. Exceptions to dietary plasticity: canine-premolar honing complex. Large upper canine is sharpened ( honed ) against the lower canine when mouth is closed. Exceptions to dietary plasticity: occlusal (chewing) surfaces. Old world monkeys = bilophodont upper and lower molars. Enamel ridge (loph) connects two cusps on front and two cusps on back of chewing surface. Apes and humans = y-5 lower molar.
