M_W_Chapter_21-2_Later_Paleozoic_Life_short_version_partial_verte_

M_W_Chapter_21-2_Later_Paleozoic_Life_short_version_partial_verte_

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What lived in the Middle and Late  Paleozoic? Marine invertebrates Great diversification of fish Late Silurian and Devonian - fish became very abundant - Note that a fossil from  Chengjiang (Middle Cambrian) is believed to be a primitive  jawless true fish) 1. jawless fish
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2. Placoderms: Fish with jaws  - this late Devonian one was 20     to 30 feet long
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Evolution of the Vertebrate Jaw Evolution of the Vertebrate Jaw gill arch gill slit moveable lower jaw
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What lived in the Middle and Late  Paleozoic? Marine invertebrates Great diversification of fish Invasion of the land
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Late Devonian Mass extinction Extinction triggered by cooling? 85% brachiopods Trilobites and gastropods declined Most fish diversity extinctions
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Vertebrate Evolution (recap.) Chordates: 1. Hemichordates (not vertebrates) - Burgess Shale fossils - Chenjiang (early Cambrian)–  and primitive jawless fish???? 2.  Jawless fish by late Silurian
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M_W_Chapter_21-2_Later_Paleozoic_Life_short_version_partial_verte_

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