Earth Sciences 2266F/G Lecture Notes - Lecture 22: Interfemoral Membrane, Notarium, Pterodactyloidea
28 Mar 2020
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Document Summary
Archosaurs: pterosaurs and birds are not directly related to each other. These are in crown groups that include: crocodiliam, pterosaurs, dinosaurs and birds. Archosaur flying involved twice: pterosaurs & birds. Basal pterosaurs: oldest pterosaur eudimorphodon has classic features: Anterior to pubis was extra bone called prepubis (function unclear) Pteroid bone projects off to support wing membrane. Main support of wing is elongated 4th finger (think as pinky finger) Wing: membrane that stretched from pinky finger to body. Wing structure: membrane is broken up into, propatagium: forward part b/w wrist of shoulder, brachiopatagium: main part, from elongated pinky to hind limbs, uropatagium: stretch b/w legs, connecting to tail. *possible furry covering pycnofibers (suggest warmblooded: rhamphorhynchoidea: heavy skull, small, unspecialized teeth, long tail. Eat fish and small reptiles: pterodactyloidea: light skull, large, specialized teeth, short tail. Eat small fish, insects some were toothless, pouch (like pelicans) Convergent evolution (b/w ptero and birds: ptero reduction of tail from rham to ptero.
