Triassic

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(Vertebrates)
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Following the extinction of many therapsids and parareptiles at the end of the Permian, new dynasties of synapsids arose. These included more advanced therapsids such a the [[Cynodontia|cynodonts]].  Cynodonts had always been a minor group during the Permian, but they now diversified to a great degree.  The dicynodonts were represented for the most part by a single family of large forms. The cynodonts were of small to moderate in size.  The largest types (such as ''Cynognathus'') only occurred during the earlier Triassic, although several large herbivore types (traversodontids like ''Exaeretodon'') appeared later. They were distinguished by a number of mammalian traits. By the Late Triassic they had given rise to the mammals, although one family, the Tritylodontidae, were to continue right through to the Early Cretaceous.
Following the extinction of many therapsids and parareptiles at the end of the Permian, new dynasties of synapsids arose. These included more advanced therapsids such a the [[Cynodontia|cynodonts]].  Cynodonts had always been a minor group during the Permian, but they now diversified to a great degree.  The dicynodonts were represented for the most part by a single family of large forms. The cynodonts were of small to moderate in size.  The largest types (such as ''Cynognathus'') only occurred during the earlier Triassic, although several large herbivore types (traversodontids like ''Exaeretodon'') appeared later. They were distinguished by a number of mammalian traits. By the Late Triassic they had given rise to the mammals, although one family, the Tritylodontidae, were to continue right through to the Early Cretaceous.
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The first true [[Mammalia|mammals]] also appeared at the end of the very end of the period.  The mammals were to remain insignificant throughout the whole of the Mesozoic era and only come into their own after the extinction of the dinosaurs.  The ancestors of small familiar animals like frogs and possibly also lizards also first appear at this time.
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The first true [[Mammalia|mammals]] also evolved from Therapsids at the end of the very end of the period.  The mammals were to remain insignificant throughout the whole of the Mesozoic era and only come into their own after the extinction of the dinosaurs.  The ancestors of small familiar animals like frogs and possibly also lizards also first appear at this time.
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Revision as of 20:18, 19 January 2009

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