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Lecture.19 - Mesozoic Marine Reptiles...

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Mesozoic Marine Reptiles http://www.cwrl.utexas.edu/~bump/E603/web/brette/mosasaur.jpg
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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
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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
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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
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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
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