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CHAPTER 12 LIFE OF THE PALEOZOIC
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Paleozoic Animals
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Marine Invertebrates
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Animals With Shells
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Anomalocaris
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Paleozoic Life
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FISHES
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Fishes – 5 Groups Ostracoderms – End of Cambrian –Jawless Placoderms – Silurian –Plate Skinned Acanthodians – Silurian –Non-armored jawed Osteichthyes – Devonian –Bony Chondrichthyes – Devonian –Cartilaginous
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f12_58_pg355 Fish Evolution
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Living Fossil – Onset Devonian Coelacanth
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Bony Fish
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Devonian Shark - Cladoselache Sharks
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Devonian Placoderm - Dunkleosteus Placoderms
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Conodont – Valuable Index Fossil
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Amphibians – “Tetrapods”
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Amphibians Descended from fish – “Ichthyostega” –Ampibian Group “Labyrinthodonts”
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Movement to Land “Amiotes”
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Amiotes Egg Laying Animals –Reptiles –Birds –Mammals
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Reptiles
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REPTILES
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Reptiles Earliest Reptiles – Synapsids Pelycosaurs: A member of the Synapsid Family that possessed reptile and mammal characteristics.
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f12_76_pg363 Pelycosaurs
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Mammals
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Descended from Synapsids –Pelycosaurs This group known as Therapsids – –Cynodonts
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Therapsids Cynodonts Mammal-Like Reptiles
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PLANTS
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Paleozoic Plants
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Crinoids Marine Plants
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Crinoid
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Bryophytes (Nonvascular) –Seedless, Spore-Bearing plants –Common in Coal-Forming Plants of Carboniferous. Trachophytes (Vascular) –Gymnosperms –Seed-Producing Pollinating Land Plants
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Bryophytes Nonvascular Plant
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Vascular Plant Trachophytes
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f12_83_pg365 Vascular Plant
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Early Conifers
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Paleozoic Extinctions
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f12_90_pg368 3 Major Extinctions
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Late Ordovician Extinction Related to Global Cooling 2 Sequences (Regressive & Transgressive) Late Devonian –Eutrophication “Anoxic Conditions” –Continental Glaciation Late Permian
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Late Devonian Extinction Eutrophication “Anoxic Conditions” Continental Glaciation
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Late Permian Extinction Global Cooling –Pangea Completed Epicontinental Seas Drained Equatorial Circulation Blocked –Volcanic Activity –Extraterrestrial Cause Asteroid
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Anoxic Conditions Linked to slowing of ocean circulation, climatic warming and elevated levels of greenhouse gases. Researchers have proposed enhanced volcanism (the release of CO 2 ) as the "central external trigger for euxinia". [5] greenhouse gasesvolcanism [5]
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THE END
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