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Chapter 4

Chapters 4 to 6

7 Pages
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Sherry Fukuzawa

Chapter 4 Monkeys, Apes and Humans Primate Order - primates share number of ancestral traits with other mammals - mammals are intelligent animals - young are born in womb - young are nourished by mothers with milk thus getting the name of Mammalia - young learn to survive as adults - mammals also active animals by body temperature and respiratory system - joints for growth two classificatory systems exist for dividing primate order Older system 1. Prosimii before monkeys, night time dwellers and tree dwelling 2. Anthropoidea monkeys, apes and humans subdivided a. Platyrrhini (New World Monkeys) b. Catarrhini - Cercopithecoidea (Old World Monkeys) and Hominoidea (apes) i. Subdivided 1. Poginae (orangutan) 2. Hominini (African apes and humans) Primate Characteristics Derived traits: traits evolved and changed from characteristics in the common ancestor Primate Brain - tend to be large and heavy in proportion - Why increased size? o Due to extinction of dinosaurs, survival at night was gone and more activity in the daylight caused for better vision which was in the brain o Also the use of the hand increased causing better coordination with the brain Primary Sense Organs - Catching insects on trees and able to jump and land safely needed good sense and vision - Binocular vision: vision increased depth perception from two eyes set next to each other allowing visual fields to overlap - Stereoscopic vision: complete 3D vision plus visual connections from each eyes to both sides of brain - Sense of smell haplorhines have least developed sense of smell - Sense of touch and grasping mechanism Primate Dentition www.notesolution.com
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