# List of ichthyosauromorph genera

This list of ichthyosauromorphs is a comprehensive listing of all genera that have ever been included in the clade Ichthyosauromorpha, 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 ichthyopterygian. Non-ichthyosaur ichthyopterygians shall be noted as such. This list contains 109 genera.

## Scope and terminology

There is no official, canonical list of ichthyosauromorph genera but one of the most thorough attempts can be found at the "Ichthyosauromorpha" 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. As this can be an extremely subjective and controversial designation, this term is not used on this list.

## The list

| Genus | Authors | Year | Status | Age | Location | Notes |
| Acamptonectes | Fischer et al. | 2012 | Valid | eK to lK | Europe | |
| Actiosaurus | Sauvage | 1883 | Disputed | | Europe | |
| Acuetzpalin | Barrientos et al. | 2020 | Valid | lJ | North America | |
| Aegirosaurus | Bardet Fernández | 2000 | Valid | lJ | Europe | A 2 meter long ophthalmosaurid whose remains were discovered in the Solnhofen limestone and mistaken for a new Ichthyosaurus species. In 2000 scientists concluded that the fossil material should be assigned to a new genus. |
| Anhuisaurus | Chen | 1985 | Jr. synonym | N/A | N/A | Preoccupied by lizard genus Anhuisaurus Hou, 1974. Junior synonym of Chaohusaurus. |
| Argovisaurus | Miedema et al. | 2024 | Valid | mJ | Europe | |
| Arthropterygius | Maxwell | 2010 | Valid | lJ | North America | |
| Athabascasaurus | Druckenmiller Maxwell | 2010 | Valid | eK | North America | |
| Auroroborealia | Zvernikov et al. | 2021 | Valid | lT | Asia | |
| Barracudasauroides | Maisch | 2010 | Valid | mT | Asia | |
| Besanosaurus | Dal Sasso Pinna | 1996 | Valid | mT | Europe | |
| Brachypterygius | von Huene | 1922 | Valid | lJ | Europe | A lJ Ophthalmosaurid closely related to Platypterygius and Caypullisaurus. Fossils have been found in England and European Russia. |
| Californosaurus | Kuhn | 1934 | Valid | lT | N. America | A 3-meter teretocnemid who is also the basal-most known Euichthyosaurian. Its remains were first recovered from the Carnian Lower Hosselkus Limestone of California. Californosaurus has also been known as Shastasaurus perrini and Delphinosaurus perrini. |
| Callawayia | Maische Matzke | 2000 | Valid | | | |
| Cartorhynchus | Motani et al. | 2015 | Valid | eT | Asia | Non-ichthyosaur ichthyosauriform |
| Catutosaurus | Fernández et al. | 2021 | Valid | lJ | South America | |
| Caypullisaurus | Fernández | 1997 | Valid | lJ to eK | S. America | A large ophthalmosaurid closely related to Platypterygius and Brachypterygius. It was discovered in strata dating to the lJ - eK of Argentina. |
| Chacaicosaurus | Fernández | 1994 | Valid | | S. America | A Bajocian genus whose fossils have been found in Argentina. Possibly a stenopterygiid. |
| Chaohusaurus | Young Dong | 1972 | Valid | eT | Asia | A primitive ichthyosaur that retained a lizard-like body discovered in Chaohu, China. It was also one of the smallest ichthyosaurs, being from 70 to 180 cm long and an estimated weight of 10 kg. |
| Chensaurus | Mazin Suteethorn Buffetaut Jaeger Helmcke-Ingavat | 1991 | Jr. synonym | N/A | N/A | Junior synonym of Chaohusaurus. |
| Chonespondylus | Leidy | 1868 | Valid | mT | | |
| Contectopalatus | Maische Matzke | 1998 | Disputed | mT | Europe | A strange mT mixosaurid with a high crest of bone on its head and a 5-meter body. It was thought to be a Mixosaurus species for some time until given its own genus in 1998. Some experts have felt that the splitting was unjustified. |
| Cryopterygius | Druckenmiller et al. | 2012 | Valid | lJ | Europe | |
| Cymbospondylus | Leidy | 1868 | Valid | eT to mT | | One of the largest ichthyosaurs, adults ranged in length from 6 m (20 ft) up to 10 m (33 ft) long. It was one of the least fish-like of the ichthyosaurs, lacking a dorsal fin and fluked tail. Consequently, Cymbospondylus probably swam by wriggling its body from side to side like a modern sea snake. |
| Dearcmhara | Brusatte et al. | 2015 | Valid | eJ to mJ | Europe | |
| Delphinosaurus | Merriam | 1905 | Jr. synonym | N/A | N/A | Junior synonym of Californosaurus. |
| Eretmorhipis | Chen et al. | 2015 | Valid | eT | Asia | Non-ichthyosaur ichthyopterygian |
| Eurhinosaurus | Abel | 1909 | Valid | eJ | Europe | A genus exceeding 6 m in length from the Sinemurian to Toarcian of England and Germany. Eurhinosaurus was built like a regular ichthyosaur, with a fish-like body including a large eyes, dorsal and caudal fins, but had one distinct feature that set it apart from other ichthyosaurs; its upper jaw was twice as long as the lower jaw and covered with sidewards-pointing 'teeth', like a sawfish's. |
| Eurypterygius | Jaekel | 1904 | Jr. synonym | N/A | N/A | Junior synonym of Ichthyosaurus. |
| Excalibosaurus | McGowan | 1986 | Valid | eJ | | Lived during the Sinemurian stage in what is now England. It is characterized by the extreme elongation of the rostrum, giving the animal a swordfish-like look. Excalibosaurus is known from two skeletons. The holotype was from a juvenile with an estimated body length of 4 m. The estimated body length of the second specimen, discovered in 1996, is 7 m. |
| Gengasaurus | Paparella et al. | In press | In press | lJ | Europe | |
| Grendelius | McGowan | 1976 | Jr. synonym | N/A | N/A | Junior synonym of Brachypterygius. |
| Grippia | Wiman | 1930 | Valid | eT | Asia Greenland Japan N. America | A small ichthyosaur only 1-1.5 m long, its fossils have been found along the coasts of Greenland, China, Japan, and Canada. |
| Guizhouichthyosaurus | Cao Luo | 2000 | Valid | lT | Asia | |
| Gulosaurus | Cuthbertson et al. | 2013 | Valid | eT | N. America | A grippidian. The type species is Gulosaurus helmi. |
| Hauffiopteryx | Maisch | 2008 | Valid | eJ | Europe | |
| Himalayasaurus | Young Dong | 1972 | Valid | lT | Asia | |
| Hudsonelpidia | McGowan | 1995 | Valid | lT | | |
| Hupehsuchus | Carroll Dong | 1991 | Valid | mT | Asia | Non-ichthyosaur ichthyopterygian from the mT of China. The type species is H. nanchangensis. |
| Ichthyosaurus | De la Beche Conybeare | 1821 | Valid | eJ | | |
| Ichthyotitan | Paul de la Salle | 2016 | Valid | lT | Europe | The largest genus of ichthyosaur that we currently know of. Fossils of Ichthyotitan have been found in the Westbury Mudstone Formation in Somerset, England. |
| Isfjordosaurus | Motani | 1999 | Valid | | | Non-ichthyosaur ichthyopterygian. |
| Jabalisaurus | Barrientos-Lara et al. | 2021 | Valid | lJ | North America | |
| Janusaurus | Roberts et al. | 2014 | Valid | lJ | Europe | An ophthalmosaurid ichthyosaur. The type species is Janusaurus lundi. |
| Kazakhstanosaurus | Bolatovna Makustovich | 2021 | Valid | lJ | Asia | |
| Keilhauia | Delsett et al. | 2017 | Valid | eK | Europe | An ophthalmosaurid ichthyosaur. The type species is Keilhauia nui. |
| Kyhytysuka | Cortés et al. | 2021 | Valid | eK | South America | |
| Leninia | Fischer et al. | 2014 | Valid | eK | Europe | An ophthalmosaurine ophthalmosaurid ichthyosaur. The type species is Leninia stellans. |
| Leptocheirus | Merriam | 1903 | Jr. synonym | N/A | N/A | Junior synonym of Toretocnemus. |
| Leptonectes | McGowan | 1996 | Valid | | Europe | Lived from the Rhaetian to Pliensbachian in what is now Belgium, England and Germany. |
| Leptopterygius | Huene | 1922 | Valid | lT to eJ | | |
| Macgowania | Motani | 1999 | Valid | | | |
| Macropterygius | Huene | 1923 | Jr. synonym | N/A | N/A | Junior synonym of Aegirosaurus. |
| Magnipterygius | Maisch Matzke | 2022 | Valid | eJ | Europe | |
| Maiaspondylus | Maxwell Caldwell | 2006 | Valid | lK | N. America | |
| Malawania | Fischer et al. | 2013 | Valid | eK | Asia | A basal member of Thunnosauria. The type species is Malawania anachronus. |
| Merriamia | Boulenger | 1904 | Jr. synonym | N/A | N/A | Junior synonym of Toretocnemus. |
| Metashastasaurus | Nicholls Manabe | 2001 | Jr. synonym | N/A | N/A | Junior synonym of Callawayia. |
| Mikadocephalus | Maisch Matzke | 1998 | Valid | | Europe | |
| Mixosaurus | Baur | 1887 | Valid | mT | | |
| Mollesaurus | Fernandez | 1999 | Valid | mJ | S. America | |
| Myopterygius | von Huene | 1922 | Syn. | | | Synonym of Platypterygius. |
| Muiscasaurus | Maxwell Dick Padilla Parra | 2015 | Valid | eK | S. America | |
| Nanchangosaurus | Wang | 1959 | Valid | mT | | |
| Nannopterygius | Huene | 1922 | Valid | lJ | Europe | Nannopterygius is a genus of ophthalmosaurid ichthyosaur that lived in from the Kimmeridgian to Tithonian. Fossils have been found in England and Germany. |
| Omphalosaurus | Merriam | 1906 | Valid | eT | Europe | An extinct genus of marine reptile from Spitsbergen. It has been considered an ichthyopterygian, however a study by Motani in 2000 showed that it lacks the basal synapomorphies of Ichthyopterygia. As such, its exact position in the diapsid tree is currently unknown. |
| Ophthalmosaurus | Seeley | 1874 | Valid | mJ to lJ | Europe N. America S. America | |
| Otschevia | Efimov | 1997 | Jr. synonym | N/A | N/A | Junior synonym of Brachypterygius. |
| Pachygonosaurus | von Huene | 1916 | Nomen dubium | | | |
| Palvennia | Druckenmiller et al. | 2012 | Valid | lJ | Europe | |
| Panjiangsaurus | Chen Chang | 2003 | Jr. synonym | N/A | N/A | Junior synonym of Guizhouichthyosaurus. |
| Parahupehsuchus | Chen et al. | 2014 | Valid | eT | Asia | |
| Paraophthalmosaurus | Arkhangelsky | 1997 | Jr. synonym | N/A | N/A | Junior synonym of Ophthalmosaurus. |
| Parrassaurus | Barrientos-Lara Alvarado-Ortega | 2021 | Valid | lJ | North America | |
| Parvinatator | Nicholls Brinkman | 1995 | Valid | | | Non-ichthyosaur ichthyopterygian. |
| Pessopteryx | Wiman | 1910 | Valid | | | |
| Pessosaurus | Wiman | 1910 | Valid | mT | | |
| Phalarodon | Merriam | 1910 | Valid | mT | Asia | |
| Phantomosaurus | Maisch Matzke | 2000 | Valid | | | |
| Platypterygius | Kuhn | 1946 | Valid | lK | | |
| Plutoniosaurus | Efimov | 1997 | Jr. synonym | N/A | N/A | Junior synonym of Platypterygius. |
| Proteosaurus | Home | 1819 | Jr. synonym | N/A | N/A | Junior synonym of Ichthyosaurus. |
| Protoichthyosaurus | Appleby | 1979 | Jr. synonym | N/A | N/A | Junior synonym of Ichthyosaurus. |
| Qianichthyosaurus | Li | 1999 | Valid | | | |
| Quasianosteosaurus | Maisch Matzke | 2003 | Valid | eT | Europe | |
| Sangiorgiosaurus | Brinkmann | 1998 | Jr. synonym | N/A | N/A | Junior synonym of Mixosaurus. |
| Sclerocormus | Jiang et al. | 2016 | Valid | eT | Asia | Non-ichthyosaur ichthyopterygian. |
| Shastasaurus | Merriam | 1895 | Valid | mT to lT | Asia Europe N. America | Shastasaurus is a genus of ichthyosaur from whose remains have been found in United States, Canada, Mexico, Austria, Italy, Switzerland, Germany, Spitsbergen and China. |
| Shonisaurus | Camp | 1976 | Valid | lT | ?Asia N. America | One of the largest ichthyosaur genera that has yet been found. Fossils of Shonisaurus were first found in Nevada in 1920. It lived during the Norian stage of the late Triassic period and had a long pointed mouth that contained teeth only at the front end. S. popularis specimens reached a length of 15 meters (49 feet). A second species, S. sikanniensis, was later discovered in British Columbia and has an estimated length of 21 meters (69 feet). |
| Simbirskia | Otschev Efimov | 1985 | Valid | | | |
| Simbirskiasaurus | Otschev Efimov | 1985 | Valid | eK | | |
| Sisteronia | Fischer et al. | 2014 | Valid | eK | Europe | A platypterygiine ophthalmosaurid ichthyosaur. The type species is Sisteronia seeleyi. |
| Stenopterygius | Jaekel | 1904 | Valid | eJ | Europe | Lived from the Toarcian to Aalenian from England, France, Germany and Luxembourg. Maximum length was 4 m. One famous fossil is that of a mother and baby that died in childbirth. This proved that ichthyosaur infants were born tail-first, just like cetaceans, to prevent them from drowning before fully clearing the birth canal. |
| Suevoleviathan | Maisch | 1998 | Valid | | | |
| Sumpalla | Campos et al. | 2021 | Valid | lJ | South America | |
| Svalbardosaurus | Mazin | 1981 | Nomen dubium | eT | | |
| Sveltonectes | Fischer Masure Arkhangelsky Godefroit | 2011 | Valid | eK | Europe | |
| Temnodontosaurus | Lydekker | 1889 | Valid | eJ | Europe | Lived from the Hettangian to Toarcian in England and Germany. It was a large genus, exceeded 12 meters (39 feet) in length. Temnodontosaurus eyes were approximately 20 cm (7.9 in) in diameter making them the largest of any known vertebrate. |
| Thaisaurus | Mazin Sutetthorn Buffetaut Jaeger Helmcke-Ignavat | 1991 | Valid | | | Non-ichthyosaur ichthyopterygian. |
| Thalassodraco | Jacobs Martill | 2020 | Valid | mJ | Europe | |
| Thalattoarchon | Fröbisch et al. | 2013 | Valid | mT | North America | |
| Tholodus | von Meyer | 1851 | Valid | mT | Possibly Asia Europe | |
| Toretocnemus | Merriam | 1902 | Valid | lT | | |
| Typicusichthyosaurus | Yin et al. | 2000 | Jr. synonym | N/A | N/A | Probable junior synonym of Guanlingsaurus, though poor preservation makes it difficult to tell |
| Undorosaurus | Efimov | 1997 | Valid | lJ | Russia | |
| Utatsusaurus | Shikoma | 1978 | Valid | eT | | Non-ichthyosaur ichthyopterygian. |
| Wahlisaurus | Lomax | 2016 | Valid | eJ | Europe | |
| Wimanius | Maisch Matzke | 1988 | Valid | | | |
| Xinminosaurus | Jiang et al | 2008 | Valid | | | Possible synonym of Tholodus. |
| Yasykovia | Efimov | 1999 | Valid | lJ | Russia | Formerly known as a synonym of Ophthalmosaurus. |
* Besanosaurus
* Californosaurus.
* Caypullisaurus.
* Chaohusaurus.
* Cymbospondylus.
* Eurhinosaurus.
* Excalibosaurus.
* Grippia.
* Hupehsuchus.
* Ichthyosaurus.
* Leptonectes.
* Mixosaurus.
* Ophthalmosaurus.
* Platypterigius.
* Shastasaurus.
* Shonisaurus.
* Stenopterygius.
* Temnodontosaurus.
* Utatsusaurus.
* Yasykovia.