9 41213 paleozoic life ordovician to devonian animal

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Unformatted text preview: bes comprise three neuropils. The brain is essen?ally that seen in a “modern” crustacean, sugges?ng that sophisticated visual processors had already evolved 535 million years ago. Ma, Hou, Edgecombe & Strausfeld 2012. Nature 490,. DOI 10.1038/nature11495 8 4/12/13 Boaom Line •  Complex, ‘modern’ animals evolved very quickly amer 700 ­500 mya… •  This includes structures like brains and compound eyes. 9 4/12/13 Paleozoic Life – Ordovician to Devonian •  Animal phyla greatly diversified in Ordovician •  First Shells = Cambrian Period (543 ­500 MYA) •  First Fish in Ordovician (about 488 ­444 Mya) •  First Land Plants and jawed fish in Silurian Period (439 ­416 MYA) – evolved from green algae •  Devonian 416 ­354 Mya – Sarcopterygii and Ac?nopterygii •  MASS EXTINCTION at end of Ordovician – 2nd greatest? Drop temp/sea level Paleozoic Life – Carboniferous and Permian •  1st Rep?les; Carboniferous Period (354 ­290 MYA) •  Diversifica?on of rep?les = Permian Period (290 ­251 MYA) •  GREATEST MASS EXTINCTION EVER (Permian/Triassic boundary) Pelycosauria –  Ocean’s lowest level –  52% Families and 96% species of skeleton bearing marine invertebrates 10 4/12/13 Meso...
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This note was uploaded on 02/02/2014 for the course ECOL 335 taught by Professor Reinthal during the Spring '10 term at Arizona.

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