ANTHROP 3300 Lecture Notes - Lecture 6: Petrous Part Of The Temporal Bone, Tympanic Part Of The Temporal Bone, Postorbital Bar

• School: Ohio State University
• Department: Anthropology
• Course: ANTHROP 3300
• Professor: Guatelli- Steinberg Debbie

Document Summary

Characteristics and trends: generalized skeleton (retain primitive mammalian features that others lost) Able to occupy many niches: tendency towards erect posture. Keep trunk upright: prehensile hands and feet. Nails with tactile pads: de-emphasis on olfaction (sense of smell, emphasis on visual sense. Advantage: chew hard foods without vision being distorted: auditory bulla formed from petrosal bone. F. 2. unique to primates: formed from petrosal bone of skull (continuous: increasing brain size (relative to body size, longer periods of infant dependency, tendency to live in social groups, origins of these trends. Angiosperm exploitation hypothesis: traits facilitated using/eating angiosperm plants that came about at this time. Fused mandible, frontal: cladistic analysis of suborders. Tarsiers, monkeys, apes and humans: platyrrhini (anthropoid infraorder) Dental formula: 2. 1. 3. 3 (primitive trait: catarrhini (anthropoid infraorder) None have prehensile tails: cercopithecoidea (catarrhini superfamily) Perhaps used to shred leaves: hominoids (catarrhini superfamily) Y-5 lower molars (unidont low, rounded: dna hybridization.