Early Primates 2010

Early Primates 2010 - EARLY PRIMATES When do we see the...

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EARLY PRIMATES Paleocene, 65-53 mya Dinosaurs are extinct; temperatures rising Major mammal radiation to fill niches left by dinosaurs Some of the small mammals (Plesiadapiforms) are primate-like, or primitive primates They occur in what became North America and Europe, which at that time were tropical Plesiadapis has been recovered in Wyoming When do we see the earliest primates?
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Known mainly from North America, but also found in Europe and China Controversy over whether primates or not Range from mouse-size to small monkey-sized Anatomically more primitive than any living primate Plesiadapis is one example early Paleocene to late Eocene Plesiadapiforms
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Why aren’t we sure when the earliest primates appear? 1.Incomplete fossil remains (mostly teeth/jaws, some skull fragments) 2. Differences among scientists on how to classify some consider them experiments in becoming primates, but just primatelike mammals In the case of the Plesiadapiforms, they don’t have even the characteristics of living prosimians Thus, they are called archaic
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Small brains, prognathic face, small eye sockets on the sides rather than front of head, no postorbital bar, and many have rodent-like incisors separated from the molars by a large diastema . Some have claws and lack an opposable big toe. Range in size from mouse to cat Plesiadapiforms
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ERA Period Epoch 65 mya 53 mya 36 mya 23 mya 1.8 mya (http://www.ucmp.berkeley.edu/cenozoic/cenozoic.html; 22 Feb 2005) 5.5 mya Geologic Time Scale N. America & Asia begin split; GLACIATION: Ice Age Central America joins N&S
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This note was uploaded on 10/04/2011 for the course ANTH 101 taught by Professor Simmons during the Spring '06 term at South Carolina.

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Early Primates 2010 - EARLY PRIMATES When do we see the...

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