| Neosaurus Temporal range: Early Permian |
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| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Synapsida |
| Order: | Pelycosauria |
| Family: | Sphenacodontidae |
| Genus: | Neosaurus Nopsca, 1923 |
| Species | |
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Neosaurus is a little-known pelycosaur of the family Sphenacodontidae. 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.