| Tethysaurus Temporal range: 93–89 Ma Turonian, Late Cretaceous |
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| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Subphylum: | Vertebrata |
| Infraphylum: | Gnathostomata |
| Class: | Sauropsida |
| Subclass: | Diapsida |
| Infraclass: | Lepidosauromorpha |
| Superorder: | Lepidosauria |
| Order: | Squamata |
| Family: | Mosasauridae |
| Genus: | Tethysaurus Bardet, Pereda-Suberbiola & Jalil, 2003 |
| Species | |
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Tethysaurus nopscai |
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Tethysaurus was a genus of mosasaur from the Early Turonian (Late Cretaceous) period. The only species is Tethysaurus nopscai. The name means "Tethys' lizard of Nopsca", a reference to the Greek goddess of the sea Tethys (also the name of the Tethys Ocean, an ancient sea between southern Europe and northern Africa) and to the Hungarian paleontologist Baron Ferenc Nopsca, who made pioneering studies on Adriatic aquatic squamates. It was found near the villages of Tadirhourst and Asflain in the region of Goumima, Errachidia Province, in Morocco, with three referred specimens that included a nearly complete articulated skull, mandible, vertebrae and portions of the appendicular skeleton. The diagnosis after Bardet et al. is "(...) prefrontal strongly vaulted in anterior view; parietal exhibits a triangular table ending posteriorly in two pointed pegs overlying the supraoccipital; jugal with a large and wide ascending ramus; medullar floor of the basioccipital pierced by three foramina; splenial with a large notched dorsomedial process; surangular exposed medially ventral to the coronoid; dental formula: 19-20 maxillary, 15-19 pterygoid and at least 19 dentary teeth; large paracotylar and parazygosphenal foramina on vertebrae."[1]
An average-sized mosasaur of 3 metres (9.8 ft) length, Tethysaurus displays a number of basal and derived features that led to a initial classification as an intermediate stage between primitive aigialosaurids of the Cenomanian and derived mosasaurids from the Turonian to the Maastrichtian.[2] More recent analysis put Tethysaurus in a clade along Russellosaurus and Yaguarasaurus called the parafamily Russellosaurina, as a basal Turonian clade of Mosasauridae.[3]
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