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9/19/2013
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EVOLUTIONBiology 145
Lecture 5 –The Late Proterozoic, The Cambrian Explosion, and Paleozoic
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Dickinsonia
Ediacaran Fauna
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Anomalocaris
Burgess Shale
505 million; middle Cambrian
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Opabina
Marella
Wiwaxia
Hallucigenia
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~ 25 body plans (bauplans) ‐ ~ 19 extinct
Historical Contingency
Biodiversity of the Burgess shale
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~ 20,000 species, 10 orders.
TRILOBITES
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12,000 (350 living)
BRACHIOPODS
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GRAPTOLITES
ECHINODERMS
Crinoids
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