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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This note was uploaded on 04/22/2008 for the course GEOL 111 taught by Professor Getty during the Fall '07 term at UConn.

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Lecture.19 - Mesozoic Marine Reptiles...

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