Within each of these two major groups there are further distinct types

Within each of these two major groups there are further distinct types

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Within each of these two major groups there are further distinct types. Within the Saurischia there are two major groups the Therapods (beast-foot) and the Sauropods . Typical Therapods are Tyrannosaurus rex , Deinonychus . These are carnivorous, have bird-like feet, bodies are balanced at the hip with a long powerful tail. Within the Sauropods are the huge species such asApatosaurus (~Brontosaurus) and Brachiosaurus . These walked on all fours, had long whip-like tails and were herbivorous. Within the Ornithischia there are five major groups: Ornithopods e.g. Hadrosaurs, duck-billed dinosaurs Ceratopians e.g., horned and frilled dinos such as Triceratops
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Unformatted text preview: Pachycephalosaurs with large bone-filled heads Stegosaurs (e.g., Stegosaurus ) with large dorsal spines of disputed use in thermoregulation Ankylosaurs heavily armored and abundant in late Cretaceous The only living relatives of Dinosaurs are Birds. From the names of the two groups one might expect that the birds descended from the Ornithischians. This is not the case. Birds are related to Therapod dinosaurs . The living sister taxon to birds are Crocodylians; how do they fit in? You probably think of Pterosaurs as dinosaurs, too, but they are not. Below is a simplified cladogram of relationships....
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This note was uploaded on 11/06/2011 for the course BIO BSC1010 taught by Professor Gwenhauner during the Fall '10 term at Broward College.

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