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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
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Burgess Shale
505 million; middle Cambrian
“Lagerstätten”
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Opabina
Marella
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Wiwaxia
Hallucigenia
~ 25 body plans (bauplans) ‐ ~ 19 extinct
Historical Contingency
Biodiversity of the Burgess shale
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~ 20,000 species, 10 orders.
TRILOBITES
Phylum: ArthropodaClass: Trilobita
12,000 (350 living)
BRACHIOPODS
Phylum: Brachiopoda
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GRAPTOLITES
Phylum: HemichordataClass: Graptolithina
ECHINODERMS
Crinoids ; Class Crinoidea
Phylum: Echinodermata
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