Homo erectus 1 - Chapter 12 The Earliest Dispersal of the...

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Unformatted text preview: Chapter 12 The Earliest Dispersal of the Genus Homo : Homo Erectus Environmental Change Three major groups of early hominids: 1. Pre-australopiths-earliest and most primitive possible hominids (7.0-4.4 Ma.) 2. Australopiths-diverse forms, some more primitive, others more derived. First definitive hominids. (4.2-1.2 Ma.) 3. Early Homo-the first members of our genus (2.4-1.4 Ma.) Body Size Larger than earlier hominids Average height about 56 May have still been quite sexually dimorphic Increased robusticity Human-like limb proportions Body Size Brain Size About 700-1,250 cc (Average of 900 cc) H. habilis only averaged between 500-800 cc. Earliest Homo H. erectus s.l. Cranial Shape Heavily built Thick cranial bones Large browridges Projecting nuchal crest Long, low braincase Little forehead development Nasal prominence Cranial Shape Thermoregulation like humans Nose sticks out Follow Allens Rule Human sweating ability Highly active (During the heat of the day) Human-like limb proportions Long stride, distance walker Endurance running Activity Levels, Thermoregulation Morphology of Homo erectus...
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Homo erectus 1 - Chapter 12 The Earliest Dispersal of the...

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