Styxosaurus
| Styxosaurus Temporal range: Late Cretaceous, (100.5-72.1 MYA)
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| Holotype skull of Styxosaurus snowii | |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Reptilia |
| Superorder: | †Sauropterygia |
| Order: | †Plesiosauria |
| Superfamily: | †Plesiosauroidea |
| Family: | †Elasmosauridae |
| Subfamily: | †Elasmosaurinae |
| Genus: | †Styxosaurus Welles, 1943 |
| Species | |
| Synonyms | |
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Styxosaurus is a genus of elasmosaurid plesiosaur that lived during the Late Cretaceous period. Three species are known: S. snowii, S. browni, and S. rezaci. Fossils are known from North America and are mainly found in the Niobrara and Pierre Shale formations. Older fossils are known from the Graneros Shale.