Evolution and Diversity of Reptiles 0.0 / 5 ? BiologyReptiles and DinosaursUniversityNone Created by: Becky_BerryCreated on: 01-12-23 07:20 Skull Morphology reptile groups are assessed using skull morphology anapsids don't have any holes in their skull except the orbit synapsids have a single fenestra as well as the orbit diapsids have two fenestrae as well as the orbit 1 of 3 Evolution of Reptiles reptiles first appeared around 315 million years ago, evolving from amphibians reptiles are tetrapods Tetrapoda split into sauropsids and synapsids during the Carboniferous (Sauropsida contains reptiles) reptiles are amniotes the first amniotes appeared in the late Carboniferous Diapsida is a clade of Sauropsida, and contains Lepidosauria and Archosauria Lepidosauria contains Squamata and Rhynchocephalia Archosauria contains Crurotarsi and Avemetatarsalia two main phylogenetic groups within Reptilia: Archosauromorpha; containing crocodiles, turtles, pterosaurs and dinosaurs Lepidosauromorpha; containing squamates, rhynchocephalians, ichthyosaurs, and plesiosaurs 2 of 3 Diversity of Modern Reptiles Testudines; contains 14 families of turtles Crocodylia: contains 3 families of crocodilians Squamata: contains 41 families of lizards and amphisbaenians and 25 families of snakes Rhycnhocephalia; contains as single species, known as the tuatara (Sphenodon punctatus) 3 of 3
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