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Temporal range: Early Permian
|A restoration of Neosaurus cynodus|
| †Neosaurus cynodus|
Neosaurus is a little-known sphenacodontid. It was related to the well known Dimetrodon, although much smaller (about 1 m in length) and lived during the Early Permian. Its fossils were found in the Jura region of France. A species of the hadrosaur dinosaur Hypsibema, H. missouriensis, is also called Neosaurus, although because the name was already in use, that species was renamed Parrosaurus before being reassigned to Hypsibema.