ANT E101 Lecture 22: Ant E 101 - Class 22 (Spring)
Document Summary
Plesiadapiforms: primitive, they retain a number of ancestral mammalian traits. No postorbital bar, long narrow snout, small brain, large incisors, spiky teeth, claws not nails. Some plesiadapiforms possessed some, but not all, derived primate traits. Not clear if they fall within, or just outside of, the primate evolutionary tree. Lack derived features of strepsirrhines or haplorhines. Marked cooling and drying trend at the end of the eocene. Extinction of certain species and evolution of new ones. Anthropoid origins, the fayum (a fossil scene in egypt) Today a fossil scene, then a moist habitat that would have supported a diverse array of tropical species. 2. 1. 3. 3 dental formula indicative of its evolutionary position before. Loss of the 2nd premolar, for a dental formula of 2. 1. 2. 3. Postdates divergence of new world monkets, and shares affinities. The arrival of new world monkeys in south america with ow anthropoids. Ancestors of nw monkeys originated in africa and rafted across the atlantic ocean.
