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Mammal-Like Reptiles

Mammal-Like Reptiles. Excavating Vertebrate Fossils Jeff Good. http://www.rareresource.com/photos/dinosaur-gallery/Dimetrodon5.jpg. Synapsids. Ancient ancestors of mammals Temporal fenestra Heterodont Fewer bones in jaw then reptiles Includes the Pelycosaurs and Therapsids.

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Mammal-Like Reptiles

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  1. Mammal-Like Reptiles Excavating Vertebrate Fossils Jeff Good http://www.rareresource.com/photos/dinosaur-gallery/Dimetrodon5.jpg

  2. Synapsids • Ancient ancestors of mammals • Temporal fenestra • Heterodont • Fewer bones in jaw then reptiles • Includes the Pelycosaurs and Therapsids http://reptilis.net/wordpress/wp-content/uploads/2010/06/dimetrodon-300x177.jpg

  3. Pelycosaurs • Carboniferous – Permian periods • Tetrapods • Suspected to be ectotherms • Elongated vertebral spines on tail or back (sails) • Dentition suggests chewing as well as carnivores, omnivores and herbivores • No epidermal scales; had skin covered in osteoderms overlain by scutes

  4. http://en.wikipedia.org/wiki/File:CotylorhynchusDB2.jpg http://images4.wikia.nocookie.net/__cb20090316233158/fossil/images/b/bf/Edaphosaurus_BW.jpg http://planetdi.startlogic.com/dinosaur_list/images/dimetrodon_rm.jpg http://en.wikipedia.org/wiki/File:Ophiacodon_mirus.jpg

  5. Therapsids • Permian – Triassic Period • Greater temporal fenestra • Further differentiated teeth • Secondary palate • Fossil records suggest hair • Most mammal-like: Cynodonts http://scienceblogs.com/loom/wp-content/blogs.dir/453/files/2012/04/i-5631005b94ef02e2d1f4fb296f6e80f5-Therapsid%20Morph%20test.jpg http://en.wikipedia.org/wiki/File:Belesodon_magnificus.JPG

  6. Rise of the Endotherm • The Secondary Palate: • Separates the nasal cavity from the oral cavity • Allows breathing while eating • Suggests endothermic organisms due to the requirement of high metabolic activities: more breathing, more eating • Eventually gave rise to secondary palate in dinosaurs http://palaeos.com/vertebrates/cynodontia/cynodontia.html

  7. http://en.wikipedia.org/wiki/File:Inostrancevia_BW.jpg http://en.wikipedia.org/wiki/File:Thrinaxodon_BW.jpg http://en.wikipedia.org/wiki/File:Estemmenosuchus_BW.jpg http://upload.wikimedia.org/wikipedia/commons/3/39/Oligokyphus_BW.jpg

  8. Works Cited • http://www.truthinscience.org.uk/tis2/index.php/component/content/article/270.html • http://en.wikipedia.org/wiki/Synapsid • http://tolweb.org/Synapsida • http://en.wikipedia.org/wiki/Pelycosaur • http://dinosaurs.about.com/od/otherprehistoriclife/a/beforedinos_2.htm • http://books.google.com/books?id=Hl_JvHqOwoIC&pg=PA481&lpg=PA481&dq=Secondary+palate+endotherms&source=bl&ots=NRm1S_wKyK&sig=_dqKZ6bfmqPBi4eikB4yv2HzxJo&hl=en&sa=X&ei=OKLzUKasK4q09QSNp4CIDg&ved=0CDgQ6AEwAg#v=onepage&q=Secondary%20palate%20endotherms&f=false

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