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Synapsid

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Synapsids ('fused arch') also known as Theropsids ('beast face'), and traditionally described as 'mammal-like reptiles', are a group of amniotes (the other being the sauropsids) that developed one opening in their skull (temporal fenestra) behind each eye, about 320 million years ago (mya) during the late Carboniferous Period. Synapsids, also known as are a group of reptiles (later mammals) that became dominant during the Permian Period. They were badly affected by the Permian extinction, leaving just a few groups left. During the Triassic, they were slowly out-competed by archosaurs, like dinosaurs. At the end of the Triassic the cynodonts, evolved into the mammals, the only living group of synaspids.

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Synapsids

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Late Carboniferous - Middle Cretaceous

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Dimetrodon grandis skeleton at the National Museum of Natural History.

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* Order Pelycosauria * ** Suborder Caseasauria ** Suborder Eupelycosauria * * Order Therapsida''' * ** Suborder Biarmosuchia ** Suborder Dinocephalia ** Suborder Anomodontia ** Suborder Gorgonopsia ** Suborder Therocephalia ** Suborder Cynodontia * For complete phylogeny, see text.

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Tetrapoda

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pink

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Osborn, 1903

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Synapsida *

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Synapsids ('fused arch') also known as Theropsids ('beast face'), and traditionally described as 'mammal-like reptiles', are a group of amniotes (the other being the sauropsids) that developed one opening in their skull (temporal fenestra) behind each eye, about 320 million years ago (mya) during the late Carboniferous Period. Synapsids, also known as are a group of reptiles (later mammals) that became dominant during the Permian Period. They were badly affected by the Permian extinction, leaving just a few groups left. During the Triassic, they were slowly out-competed by archosaurs, like dinosaurs. At the end of the Triassic the cynodonts, evolved into the mammals, the only living group of synaspids.