outline20 - (E. Dev. - Cret.) 6. Medium-large initial...

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  Outline 20 4/16/03   Patterns  for marine invertebrates:      1. Large initial radiation, followed by gradual decline in diversity, leading to          final extinction - Trilobites  (Cambrian - Permian)      2. Medium-sized radiation, soon followed by extinction (1 burst) -          Archaeocyathids  (E. - M. Camb.), Fusulinids  (Miss. - Perm.), and          Rudistids  (L. Jur. - Cret.)      3. Gradual diversification, leading to higher diversity through time and          major success today -  Bivalves, Gastropods , and Crustaceans          (Camb. - Rec.)      4. Medium-sized initial radiation, followed by slow decline in diversity,          leading to relict status today - Nautiloids  (L. Camb. - Rec.)      5. Repeated medium-large "booms" followed by "busts", leading to           final extinction - Ammonoids
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Unformatted text preview: (E. Dev. - Cret.) 6. Medium-large initial radiation to high diversity, followed by big drop in diversity at a mass extinction, followed by gradual recovery to lower diversity levels today - Articulate Brachiopods, Crinoids , Bryozoans (Camb. or E. Ord. - Rec.) 7. Small initial radiation, followed by gradual decline throughout the rest of the record to relict status today - Inarticulate Brachiopods , Horseshoe Crabs (Camb. - Rec.) 8. Small initial radiation, followed by surviving a mass extinction and radiating to much higher diversity continuing to the Recent - Echinoids (L. Ord. - Rec.) Back to Outline Main page...
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outline20 - (E. Dev. - Cret.) 6. Medium-large initial...

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