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Unformatted text preview: Ch. 13: Paleozoic Life History: Vertebrates and Plants Key words- Vertebrate evolution- Fish- Amphibians- Reptiles- Plants Vetebrate Evolution- Phylum Chordata: animals with notochord, dorsal hollow nerve cord, and gills slits during part of its life cycle- Vertebrates: subphylum of chordata; animals with backbones- Early members: soft-bodied, few fossils, Cambrian- Close relationship chordata and echinodermata Fish- Most primitive vertebrates- Late Cambrian to present- Upper Cambrian (NE Wyoming) o Class Agnatha (jawless fish) o Phosphatic scales- Ostracoderms o Bony skin, armored jawless fish o Oldest, most primitive Agnatha o Late Cambrian to Devonian- Cambrian and Ordovician fish: shallow, nearshore marine- Silurian: earliest nonmarine fish- Evolution of jaw: - _____________________ : first jawed fish (Lower Silurian), extinct during Permian; probable ancestors of present-day fish 1 groups- _______________: plate skinned, heavy armor, jawed fish, freshwater and marine, e.g. Dunkleosteus (Late Devonian, largest fish of the time, 12 m)- Devonian: __________________: all major groups present...
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- Spring '10