PSYCH 450 Lecture Notes - Lecture 3: Western Lowland Gorilla, Grooming Claw, 5 Fingers
Document Summary
1/30/17 lecture 3: evolutionary trends of the primate order: tarsier, exam question: are monkeys more like prosimians, genetically speaking, or more like. Free mobility of fingers and toes: opposable thumb: picking up things, holding onto branches, jumping, baby grabs onto mom or dad, whoever, 3. Replacement of claws with nails: exceptions: grooming claw of prosimians and in the tarsier, reversion back to claws in the marmosets and tamarins, most monkeys have nails though. No, they have nails: monkeys have fingerprints, 4. Reduction in number of teeth: ancestral pattern = 44, 3-1-4-3, primitive primate = 40, 2-1-4-3, nw monkey = 36, 2-1-3-3, ow monkey and ape = 32, 2-1-2-3, exceptions: marmosets/tamarins 2-1-3-2, aye-aye 1-0-0-3. Abbreviation of snout: exception: the baboons, made faithful decision to go out into grassland so had to be able to defend itself against predators so developed large canines, example of neoteny, 8. Trend toward erect posture: vertical clinging and leaping, brachiation.
