M_W_Chapter_21-2A_Later_Paleozoic_Life_partial_short_version

M_W_Chapter_21-2A_Later_Paleozoic_Life_partial_short_version...

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Paleozoic Life (continued) Mass extinction at end of Ordovician wiped out most warm-water invertebrates Survivors: cold-adapted animals from high latitudes or deep water Low diversity in Silurian Marine ecosystem recovered by Devonian
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What lived in the Middle and Late Paleozoic? Marine invertebrates new species of trilobites, brachiopods, corals, graptolites (until end Silurian) etc. trilobites become less abundant straight nautiloids gradually replaced by the ammonite ancestors (mostly coiled) “sea scorpions” (Eurypterids) become dominant predators in the Silurian
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Eurypterids (“Sea scorpions”) dominant predators in Silurian, spreading into freshwater environments
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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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Agnatha (Jawless fish): from Cambrian
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M_W_Chapter_21-2A_Later_Paleozoic_Life_partial_short_version...

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