outline23 - based on openings behind orbits (eyes):...

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  Outline 23 4/23/03   Amphibians  - 1st terrestrial vertebrates, half-way solution to living      on land   small radiation to 3 groups with ~4,600  living sp.      Labyrinthodonts † - Dev. - Jur. - 1st amphibians, distinctive teeth      Lissamphibians  - Jur. - Rec. - tailed amphibians - salamanders,                                               mud puppies   Reptiles  - 1st fully terrestrial vertebrates because of amniote egg      (lay on land), leathery or scaly skin, and better limb attachments      Range Penn. - Rec.      Produce a major radiation      ~7,200  living species (mostly lizards + snakes)      Four major skull designs
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Unformatted text preview: based on openings behind orbits (eyes): Anapsids (no openings) - earliest stem reptiles + turtles Synapsids (one opening - low) - pelycosaurs therapsids mammals * (separate class) Euryapsid (one opening - high) - ichthyosaurs, plesiosaurs Diapsid (two openings -high + low) - lizards (incl. mosasaurs) + snakes, thecodonts, pterosaurs, crocodilians, dinosaurs birds * Radiation produced groups that became aquatic again (4+ groups) + 1st flying forms (2+ groups) Stem reptiles dominate Penn. - M. Perm., therapsids dominate L. Perm. - L. Triassic with Triassic thecodonts, dinosaurs dominate L. Triassic - L. Cretaceous. Back to Outline Main page...
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This note was uploaded on 05/05/2011 for the course GEO 404c taught by Professor Staff during the Spring '08 term at University of Texas at Austin.

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outline23 - based on openings behind orbits (eyes):...

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