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Pelycosaurs
Temporal range: Upper Carboniferous – Upper Permian
Dimetrodon.jpg
Dimetrodon grandis skeleton at the
National Museum of Natural History
Scientific classification
Kingdom:
Phylum:
Superclass:
Class:
Order:
Pelycosauria *

Cope, 1878
Suborders

Sphenacodontia

Caseasauria

Pelycosaurs (meaning "basin lizards") were the earliest synapsids. They were not dinosaurs or reptiles. They are an informal group which were once called the "mammal-like reptiles". The term is only used informally, if at all, in the modern scientific literature.

These tetrapods appeared during the Pennsylvanian and went extinct at the end of the Permian period. They were the dominant land animals for some 40 million years, and were almost wiped out by the P/Tr extinction event. A few survived until the lower Triassic to form the therapsids. The therapsids led to the mammals.

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