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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.
- Spring '08