Kimmerosaurus
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Kimmerosaurus Temporal range: 150.8–145.5 Ma Late Jurassic, Tithonian |
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| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Reptilia |
| Order: | Plesiosauria |
| Suborder: | Plesiosauroidea |
| Family: | |
| Genus: |
Kimmerosaurus Brown, 1981 |
| Species | |
Kimmerosaurus ("lizard from Kimmeridge") is an extinct genus of plesiosaur from the family , closely related to Tatenectes.
The first part of the genus name of Kimmerosaurus comes from the location of the first Kimmerosaurus fossils, Kimmeridge Clay deposits of Dorset, England (these deposits are also the root word for the Kimmeridgian stage of the Jurassic period). The second part comes from the Greek word σαυρος (sauros), "lizard".
As Kimmerosaurus is known from only a skull (and a few cervical vertebrae), much of the plesiosaur's description comes from its teeth, which are recurved and buccolingually compressed (compressed cheek-side to tongue-side). The premaxilla has only eight teeth, while there are thirty-six teeth on each ramus. The parietals of Kimmerosaurus do not form a sagittal crest. The overall skull of Kimmerosaurus is similar to but much more broad.
There are very few fossil remains of Kimmerosaurus known. In fact, nothing has been found to show what Kimmerosaurus may have looked like below the neck, although the atlas and the axis are similar to those of the plesiosaur Colymbosaurus. It is this lack of any post-cranial fossils, and the bone similarities that has led to the belief that Kimmerosaurus fossils could be the missing head of Colymbosaurus, a similar plesiosaur with no known skull fossils.
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