Lecture.19

Lecture.19 - Mesozoic Marine Reptiles

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Unformatted text preview: Mesozoic Marine Reptiles http://www.cwrl.utexas.edu/~bump/E603/web/brette/mosasaur.jpg None of the animals we are covering today are dinosaurs; they are only distantly related The dinosaurs are a completely terrestrial group Despite being able to swim, dinosaurs appear to have never evolved fully aquatic/marine species Dinosaurs are archosaurs, whereas the marine reptiles are lepidosauromorphs There are three groups of marine reptiles: Sauropterygians Ichthyosaurs Mosasaurs The sauropterygians can be further divided into Placodonts Nothosaurs Plesiosaurs The sauropterygians and ichthyosaurs were once placed into a group called the Euryapsida because they had only one set of temporal fenestrae in their skulls However, it is now believed that the euryapsid condition is a modified diapsid condition in which the lateral temporal fenetrae is filled in with bone http://upload.wikimedia.org/wikipedia/commons/thumb/f/fd/Skull_diapsida_1 .png/240px-Skull_diapsida_1.png http://content.answers.com/main/content/wp/en-commons/thumb/c/c1/235px- Skull_euryapsida_1.png http://content.answers.com/main/content/wp/en-commons/ thumb/1/17/200px-Skull_synapsida_1.png Synapsid Diapsid Euryapsid X Placodonts This group is confined to the Middle and Late Triassic of Europe, North Africa, and the Middle East Their skeletons are found in shallow marine deposits They have short stout bodies, about 1-3 m long, and a massive, heavily-built skull Carroll (1988) Fig. 12.15 Placodus...
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Lecture.19 - Mesozoic Marine Reptiles

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