Early Hominins Part 2; Bio Anth
Early Hominins Part 2; Bio Anth Anth 1001
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This 1 page Class Notes was uploaded by Jaimee Kidd on Wednesday April 13, 2016. The Class Notes belongs to Anth 1001 at George Washington University taught by Shannon C. McFarlin in Spring 2016. Since its upload, it has received 9 views. For similar materials see Biological Anthropology in anthropology, evolution, sphr at George Washington University.
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Date Created: 04/13/16
Early Hominins Part 2 Major Evolutionary Trends at 2.5 Mya • Robust Australopiths: Paranthropus ◦ Characterized by dental traits that we think would’ve allowed them to have large biting forces ▪ hard food objects like nuts and seeds or things that are tough to chew and break down like leaves ▪ “hyper chewing” characteristics ▪ Enlarged sagittal crest and shifted more towards the front of the cranium—enlarged and reoriented chewing muscled ▪ Flared zygomatic bones (cheek bones) ▪ Strong postorbital construction—also has to do with the enlargement of the chewing muscles ▪ Very robustly built mandibles ◦ Enlarged check teeth with thick molar enamel; frontal dental reduction and crowding ◦ Paranthropus aethiopicus ▪ (East Africa 2.7-2.5 mya) ▪ Well developed sagittal and nuchal crests ▪ Relatively small brain ▪ Forward projecting check bones (zygomatic bones) ▪ Prognathism; “dish-shaped” face ◦ Paranthropus boisei ▪ (East Africa 2.3-1.2 mya) ▪ Face ▪ Forward-projecting cheek bones ▪ Forwardly-placed sagittal crest ▪ Reduced prognathism ▪ Teeth ▪ Thick enamel ▪ Anterior dental crowding; marked reduction in incisors and canines ▪ Enlargement of premolars and canines; post canine megadonty ◦ Paranthropus robustus ▪ South Africa, 2-1.5 mya ▪ Omnivorous ▪ Tough foods during times of resource scarcity
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