# List of mosasaur genera

This list of mosasaurs is a comprehensive listing of all genera that have ever been included in the family Mosasauridae or the parent clade Mosasauroidea, excluding purely vernacular terms. The list includes all commonly accepted genera, but also genera that are now considered invalid, doubtful (nomen dubium), or were not formally published (nomen nudum), as well as junior synonyms of more established names, and genera that are no longer considered mosasauroid. Non-mosasaurid mosasauroids shall be noted as such. The list currently includes 91 genera, out of which 57 are considered valid (47 mosasaurids and 10 other mosasauroids).

## Scope and terminology

There is no official, canonical list of mosasaur genera but one of the most thorough attempts can be found on the "Pythonomorpha" section of Mikko Haaramo's Phylogeny Archive.
Naming conventions and terminology follow the International Code of Zoological Nomenclature. Technical terms used include:
* Junior synonym: A name which describes the same taxon as a previously published name. If two or more genera are formally designated and the type specimens are later assigned to the same genus, the first to be published (in chronological order) is the senior synonym, and all other instances are junior synonyms. Senior synonyms are generally used, except by special decision of the ICZN, but junior synonyms cannot be used again, even if deprecated. Junior synonymy is often subjective, unless the genera described were both based on the same type specimen.
* Nomen nudum (Latin for "naked name"): A name that has appeared in print but has not yet been formally published by the standards of the ICZN. Nomina nuda (the plural form) are invalid, and are therefore not italicized as a proper generic name would be. If the name is later formally published, that name is no longer a nomen nudum and will be italicized on this list. Often, the formally published name will differ from any nomina nuda that describe the same specimen. In this case, these nomina nuda will be deleted from this list in favor of the published name.
* Preoccupied name: A name that is formally published, but which has already been used for another taxon. This second use is invalid (as are all subsequent uses) and the name must be replaced. As preoccupied names are not valid generic names, they will also go unitalicized on this list.
* Nomen dubium (Latin for "dubious name"): A name describing a fossil with no unique diagnostic features.

## Mosasaur genera

| Genus | Authors | Year | Status | Location | Notes |
| Acteosaurus | Meyer | 1860 | Valid | Slovenia | More basal than the Mosasauridae, potentially a non-mosasaurid mosasauroid, though likely more basal. Perhaps a dolichosaurid. |
| Adriosaurus | Seeley | 1881 | Valid | Slovenia | More basal than the Mosasauridae, its position within Squamata is uncertain. |
| Aigialosaurus | Kramberger | 1892 | Valid | Croatia | Non-mosasaurid mosasauroid, classified within the Aigialosauridae. |
| Amphekepubis | Mehl | 1930 | Nomen dubium | Mexico | Possible junior synonym of Mosasaurus. |
| Amphorosteus | Gibbs | 1851 | Nomen dubium | USA | Nomen dubium |
| Ancylocentrum | Schmidt | 1927 | Jr. synonym | | Junior synonym of Prognathodon. |
| Angolasaurus | Telles-Antunes | 1964 | Valid | Angola  Niger  USA  Brazil | |
| Baptosaurus | Marsh | 1870 | Jr. synonym | N/A | Junior synonym of Halisaurus. |
| Baseodon | Leidy | 1865 | Jr. synonym | N/A | Junior synonym of Mosasaurus. |
| Batrachiosaurus | Harlan | 1839 | Jr. synonym | N/A | Junior synonym of Mosasaurus. |
| Bentiabasaurus | Polcyn Schulp Gonçalves | 2023 | Valid | Angola | |
| Brachysaurana | Strand | 1928 | Jr. synonym | N/A | Junior synonym of Prognathodon. |
| Brachysaurus | Williston | 1897 | Preoccupied | N/A | Preoccupied by a junior synonym of an iguanian lizard genus, Stenocercus; referred to replacement names Brachysaurana and Ancylocentrum, of which Ancylocentrum has priority as such. |
| Carinodens | Woodward | 1891 | Valid | Morocco  Netherlands  Ukraine  Russia  Belgium | |
| Carsosaurus | Kornhuber | 1893 | Valid | Slovenia | |
| Clidastes | Cope | 1868 | Valid | Russia  Jordan  Germany  USA  Sweden  Mexico | |
| Compressidens | Dollo | 1924 | Preoccupied | N/A | Preoccupied by a tusk shell; later renamed Carinodens. |
| Dallasaurus | Polcyn Bell | 2005 | Valid | USA | |
| Dolichosaurus | Owen | 1894 | Valid | UK | Non-mosasaurid mosasauroid. |
| Dollosaurus | Yakovlev | 1901 | Disputed | Spain  Sweden  Russia | Possible junior synonym of Prognathodon. |
| Ectenosaurus | Russell | 1967 | Valid | USA | |
| Edestosaurus | Marsh | 1871 | Jr. synonym | | Junior synonym of Clidastes. |
| Eidolosaurus | Nopcsa | 1923 | Valid | Slovenia | Potentially a non-mosasaurid mosasauroid, though has an uncertain phylogenetic placement. |
| Elliptonodon | Emmons | 1858 | Jr. synonym | | Junior synonym of Tylosaurus. |
| Eonatator | Bardet Pereda Suberbiola Iarochène Bouya Amaghzaz | 2005 | Valid | Colombia  Sweden | |
| Eremiasaurus | Leblanc Caldwell Bardet | 2012 | Valid | Morocco | Type species is Eremiasaurus heterodontus. |
| Gavialimimus | Strong Caldwell Konishi Palci | 2020 | Valid | Morocco | |
| Globidens | Gilmore | 1912 | Valid | USA  Belgium  Jordan  Angola  Syria  Morocco  Egypt  Brazil  Indonesia | |
| Gnathomortis | Lively | 2020 | Valid | USA | |
| Goronyosaurus | Azzaroli de Guili Ficcarelli Torre | 1972 | Valid | Morocco | |
| Haasiasaurus | Polcyn Tchernov Jacobs | 2003 | Valid | State of Palestine | |
| Hainosaurus | Dollo | 1885 | Valid | Sweden  Russia  Poland  USA  France  Belgium  Spain | |
| Halisaurus | Marsh | 1869 | Valid | Morocco  Niger  Jordan  Peru  DRC  USA  Belgium | Renamed Baptosaurus Marsh, 1870 when Marsh thought the name was preoccupied by a fish: Halosaurus. Modern rules allow the original. |
| Harranasaurus | Kaddumi | 2009 | Valid | Jordan | |
| Holcodus | Gibbs | 1851 | Jr. synonym | | Junior synonym of Platecarpus. |
| Holosaurus | Marsh | 1880 | Preoccupied | | Referred to Platecarpus. |
| Hydrosaurus | Kornhuber | 1873 | Preoccupied | | Preoccupied by an agamid lizard; renamed Pontosaurus. |
| Igdamanosaurus | Zdansky | 1935 | Valid | Niger  Egypt  Morocco | |
| Jormungandr | Zietlow Boyd Van Vranken | 2023 | Valid | USA | |
| Kaikaifilu | Otero Soto-Acuña Rubilar-Rogers Gutstein | 2016 | Valid | Antarctica | |
| Khinjaria | Longrich Polcyn Jalil Pereda-Superbiola Bardet | 2024 | In press | Morocco | |
| Kolposaurus | Camp | 1942 | Preoccupied | | Preoccupied by a junior synonym of Nothosaurus, referred to Plotosaurus |
| Komensaurus | Caldwell Palci | 2007 | Valid | Slovenia | |
| Kourisodon | Nicholls Meckert | 2002 | Valid | Japan  Canada | |
| Lakumasaurus | Novas Fernandez Gasparini de Lirio Mumez Puerta | 2002 | Jr. synonym | | Junior synonym of Taniwhasaurus. |
| Latoplatecarpus | Konishi Caldwell | 2011 | Valid | Canada | Type species is Latoplatecarpus willistoni. A second species is Latoplatecarpus nichollsae originally described in genus Plioplatecarpus. |
| Leiodon | Owen | 1841 | Preoccupied | Spain  Ukraine  UK | Preoccupied by a fish, referred to Liodon. |
| Lesticodus | Leidy | 1861 | Jr. synonym | | Junior synonym of Mosasaurus. |
| Lestosaurus | Marsh | 1872 | Jr. synonym | | Junior synonym of Platecarpus. |
| Liodon | Agassiz | 1846 | Nomen dubium | USA  Germany  New Zealand  Angola | Dubious genus due to the fragmentary nature of the type specimen and the type species L. anceps. All species referred to it likely do not belong to the same genus. |
| Macrosaurus | Owen | 1849 | Jr. synonym | | Junior synonym of Halisaurus. |
| Megapterygius | Konishi Ohara Misaki Matsuoka Street Caldwell | 2023 | Valid | Japan | |
| Mesoleptos | Cornalia | 1851 | Valid | Croatia  Slovenia  State of Palestine | More basal than the Mosasauridae, its position within Squamata is uncertain. |
| Moanasaurus | Wiffen | 1980 | Valid | | |
| Mosasaurus | Conybeare | 1822 | Valid | UK  Bulgaria  Canada  New Zealand  Netherlands  Turkey  Poland  Angola  USA  DRC  Russia  South Africa  Sweden  Poland  Syria  Spain  Japan  Denmark  Belgium  Niger  Italy  Jordan  Morocco | |
| Nectoportheus | Cope | 1868 | Jr. synonym | | Junior synonym of Mosasaurus. |
| Opetiosaurus | Kornhuber | 1901 | Disputed | | Possible junior synonym of Aigialosaurus. |
| Oterognathus | Dollo | 1889 | Jr. synonym | | Junior synonym of Plioplatecarpus. |
| Pannoniasaurus | Makádi Caldwell Ősi | 2012 | Valid | | |
| Phosphorosaurus | Dollo | 1889 | Valid | Angola | |
| Platecarpus | Cope | 1869 | Valid | USA  Angola  Russia  Syria  Egypt  Sweden  Morocco  Jordan  Canada  Brazil  Spain  Niger  Australia | |
| Plesioplatecarpus | Konishi Caldwell | 2011 | Valid | | Type species is Plesioplatecarpus planifrons, originally described in genus Clidastes, and later recombined in Platecarpus. |
| Plesiotylosaurus | Camp | 1942 | Valid | | |
| Plioplatecarpus | Dollo | 1882 | Valid | USA | |
| Plotosaurus | Camp | 1951 | Valid | USA | |
| Pluridens | Lingham-Sollar | 1998 | Valid | Niger | |
| Pontosaurus | Kornhuber | 1873 | Valid | Croatia  Lebanon | Potentially a non-mosasaurid mosasauroid, though has an uncertain phylogenetic placement. |
| Portunatasaurus | Campbell Mekarski Japundžić Krizmanić Caldwell | 2019 | Valid | Croatia | Non-mosasaurid mosasauroid. |
| Proaigialosaurus | Kuhn | 1958 | Valid | | Non-mosasaurid mosasauroid, classified within the Aigialosauridae. |
| Prognathodon | Dollo | 1889 | Valid | Belgium  USA  Saudi Arabia  Spain  Israel  Angola  Italy  New Zealand  DRC  Russia  Canada  Poland  France  Germany  Netherlands  Syria  Jordan | Possibly paraphyletic. |
| Prognathosaurus | Dollo | 1889 | Jr. synonym | | Junior synonym of Prognathodon. |
| Pterycollosaurus | Dollo | 1882 | Jr. synonym | | Junior synonym of Mosasaurus. |
| Rhamphosaurus | Cope | 1872 | Preoccupied | | Preoccupied by another lizard, referred to Tylosaurus. |
| Rhinosaurus | Marsh | 1872 | Preoccupied | | Preoccupied, referred to Tylosaurus. |
| Rikisaurus | Wiffen | 1990 | Jr. synonym | New Zealand | Junior synonym of Moanasaurus. |
| Rikkisaurus | Bell Caldwell Holmes Wiffen McKee | 1999 | Lapsus calami | | Lapsus calami of Rikisaurus. |
| Romeosaurus | Palci Caldwell Papzzoni | 2013 | Valid | Italy | |
| Russellosaurus | Polson Bell | 2005 | Valid | USA | |
| Sarabosaurus | Polcyn Bardet Albright Titus | 2023 | Valid | USA | |
| Saurochampsa | Wagler | 1830 | Jr. synonym | | Junior synonym of Mosasaurus. |
| Selmasaurus | Wright Shannon | 1988 | Valid | USA | |
| Sironectes | Cope | 1840 | Jr. synonym | | Junior synonym of Platecarpus. |
| Stelladens | Longrich Jalil Pereda-Suberbiola Bardet | 2023 | Valid | Morocco | |
| Taniwhasaurus | Hector | 1874 | Valid | Antarctica  New Zealand  Japan | |
| Tethysaurus | Bardet Superbiola Jalil | 2003 | Valid | Morocco | |
| Thalassotitan | Longrich Jalil Khaldoune Yazami Pereda-Suberbiola Bardet | 2022 | Valid | Morocco | |
| Tylosaurus | Marsh | 1872 | Valid | USA  Canada  Spain  Jordan  Mexico  Sweden  New Zealand | |
| Vallecillosaurus | Smith Buchy | 2008 | Valid | Mexico | More basal than the Mosasauridae, its position within Squamata is uncertain. |
| Xenodens | Longrich Bardet Schulp Jalil | 2021 | Valid | Morocco | |
| Yaguarasaurus | Paramo | 1994 | Valid | Colombia | |
* Aigialosaurus.
* Clidastes.
* Globidens.
* Goronyosaurus.
* Hainosaurus.
* Halisaurus.
* Harranasaurus.
* Latoplatecarpus.
* Mosasaurus.
* Platecarpus.
* Plesioplatecarpus.
* Plioplatecarpus.
* Plotosaurus.
* Prognathodon.
* Selmasaurus.
* Taniwhasaurus.
* Tylosaurus.
* Vallecillosaurus.