CHAPTER 12 LIFE OF THE PALEOZOIC. f10_01_pg268 Paleozoic Animals.

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Presentation transcript:

CHAPTER 12 LIFE OF THE PALEOZOIC

f10_01_pg268

Paleozoic Animals

Marine Invertebrates

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Animals With Shells

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f12_40e_pg347

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Anomalocaris

Paleozoic Life

FISHES

Fishes – 5 Groups Ostracoderms – End of Cambrian –Jawless Placoderms – Silurian –Plate Skinned Acanthodians – Silurian –Non-armored jawed Osteichthyes – Devonian –Bony Chondrichthyes – Devonian –Cartilaginous

f12_58_pg355 Fish Evolution

Living Fossil – Onset Devonian Coelacanth

Bony Fish

Devonian Shark - Cladoselache Sharks

Devonian Placoderm - Dunkleosteus Placoderms

Conodont – Valuable Index Fossil

Amphibians – “Tetrapods”

Amphibians Descended from fish – “Ichthyostega” –Ampibian Group “Labyrinthodonts”

f12_73_pg361

Movement to Land “Amiotes”

Amiotes Egg Laying Animals –Reptiles –Birds –Mammals

Reptiles

REPTILES

Reptiles Earliest Reptiles – Synapsids Pelycosaurs: A member of the Synapsid Family that possessed reptile and mammal characteristics.

f12_76_pg363 Pelycosaurs

Mammals

Descended from Synapsids –Pelycosaurs This group known as Therapsids – –Cynodonts

Therapsids Cynodonts Mammal-Like Reptiles

PLANTS

Paleozoic Plants

Crinoids Marine Plants

Crinoid

Bryophytes (Nonvascular) –Seedless, Spore-Bearing plants –Common in Coal-Forming Plants of Carboniferous. Trachophytes (Vascular) –Gymnosperms –Seed-Producing Pollinating Land Plants

Bryophytes Nonvascular Plant

Vascular Plant Trachophytes

f12_83_pg365 Vascular Plant

Early Conifers

Paleozoic Extinctions

f12_90_pg368 3 Major Extinctions

Late Ordovician Extinction Related to Global Cooling 2 Sequences (Regressive & Transgressive) Late Devonian –Eutrophication “Anoxic Conditions” –Continental Glaciation Late Permian

Late Devonian Extinction Eutrophication “Anoxic Conditions” Continental Glaciation

Late Permian Extinction Global Cooling –Pangea Completed Epicontinental Seas Drained Equatorial Circulation Blocked –Volcanic Activity –Extraterrestrial Cause Asteroid

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]

THE END