Synapsid

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Synapsids

<tr><td>Kingdom:<td>Animalia <tr><td>Phylum:<td>Chordata <tr><td>Subphylum:<td>Vertebrata <tr><td>Infraphylum:<td>Tetrapoda <tr><td>Microphylum:<td>Amniota <tr><td>Superclass:<td>Synapsida </table> <tr><th bgcolor=pink>Classes <tr><td> Mammalia (Mammals)
Morganucodon
Tritheledontidae
Tritylodontidae </table> The synapsids are a group of vertebrate animals whose only surviving members are the mammals. The name is derived from the fact that their skull only has one opening on each side behind the eyes. (cf. Diapsid). Synapsids seem to have evolved from proto-'reptiles' during the Upper Carboniferous, (about 300 million years ago). They were the dominant terrestrial animals of the Permian period, but were almost exterminated by the Permian-Triassic extinction event. More derived representatives belong within Therapsida. Three orders of therapsids survived into the Triassic. Two of these, the dicynodonts and cynodonts, flourished but then mostly died out during the Carnian, Upper Triassic. Some exceptions were the yet still further derived eucynodonts. At least three groups of them survived.

The extremely mammal-like family, Tritylodontidae, survived into the Lower Cretaceous.
An extremely mammal-like family, Tritheledontidae, are unknown beyond the Lower Jurassic.
The third group, Morganucodon and similar animals, were stem-mammals.

External link

Tree of Life - Synapsida

da:Pattedyrlignende krybdyr es:Synapsida fr:Synapside nl:Synapsida ja:哺乳類型爬虫類

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DLJessup (Last Contributor)

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