This list of mosasaur type specimens is a list of fossils that are official standard-bearers for inclusion in the species and genera of the squamate clade Mosasauroidea, which includes the line of predatory marine lizards that culminates in the mosasaurids. Type specimens are definitionally members of biological taxa, and additional specimens are "referred" to these taxa only if an expert deems them sufficiently similar to the type.
The list Species Genus Nickname Catalogue number Institution Age Unit Country Notes ImagesJormungandr walhallaensisJormungandr"Jorgie"NDGS 10838North Dakota State Fossil CollectionCampanianPembina Member, Pierre Shale FormationNorth Dakota, USAMosasaurus hoffmanniiMosasaurusle grand animal fossil des carrièrs de MaestrichtMNHN AC 9648Muséum national d'Histoire NaturelleMaastrichtianKanne Horizon, Nekum Chalk, Maastricht FormationNetherlandsThe holotype specimen was excavated from the limestone quarries of Mount Saint Peter near Maastricht. It is the second documented discovery of mosasauroid fossils and was found between the 1770s and early 1780s. It was brought to Paris after the siege of Maastricht, where it was studied by Cuvier.Mosasaurus missouriensisMosasaurus The Goldfuss MosasaurMNHN 9587/RFWUIP 1327Muséum national d'Histoire Naturelle/Goldfuß MuseumCampanianDeGrey Formation (Pierre Shale Group)South Dakota (USA)MNHN 9587 and RFWUIP were uncovered separately. MNHN 9587 was originally assessed as 'Ichtyosaurus missouriensis', while RFWUIP 1327 was described as 'Mosasaurus maximiliani'. Later both specimens were confirmed to belong to the same individual and the species name was established.Sarabosaurus dahliSarabosaurusUMNH VP21800Natural History Museum of UtahTuronianTropic ShaleUtah (USA)Tylosaurus prorigerTylosaurusMCZ 4374Museum of Comparative Zoology, Harvard University, Cambridge, MassachusettsNiobrara FormationKansas (USA)The specimen consists of the anterior portion of a skull, cranial fragments and thirteen vertebrae. The species was originally named Macrosaurus proriger.
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