| Plesiosauridae Temporal range: 199–145 Ma Early Jurassic - Late Jurassic |
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| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Reptilia |
| Superorder: | †Sauropterygia |
| Order: | †Plesiosauria |
| Superfamily: | †Plesiosauroidea |
| Family: | †Plesiosauridae Gray, 1825 |
| Genera | |
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Hydrorion |
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Plesiosauridae was a monophyletic family of plesiosaurs.[1]
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