This list of pelycosaurs is an attempt to create a comprehensive listing of all genera that have ever been included in the synapsida excluding therapsida and purely vernacular terms. The list includes all commonly accepted genera, but also genera that are now considered invalid, doubtful (nomina dubia), or were not formally published (nomina nuda), as well as junior synonyms of more established names, and genera that are no longer considered pelycosaurs.

The list currently contains 83 generic names.

Naming conventions and terminology 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. Nomen oblitum (Latin for "forgotten name"): A name that has not been used in the scientific community for more than fifty years after its original proposal. 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.

List

Genus Authors Year Status Age Location NotesAerosaurusRomer1937 Valid. Late Carboniferous - Lower Permian United States of AmericaAngelosaurusOlson Beerbower1953Valid.Upper PermianUnited States of AmericaAnglosaurusBruner1991SicN/AN/AIncorrect spelling for AngelosaurusApsisaurusLaurin1991Valid.Lower PermianUnited States of AmericaFormerly assigned as a "eosuchian" diapsid.ArchaeobelusCope1877Syn.N/AN/ASynonym of ClepsydropsArchaeothyrisReisz1972Valid.Upper CarboniferousUnited States of AmericaArchaeovenatorReisz Dilkes2003 Valid. Upper Carboniferous United States of AmericaArribasaurusWilliston1914Syn.N/AN/ASynonym of OphiacodonBaldwinonusRomer Price1940 Valid. Late Carboniferous - Early Permian United States of AmericaBasicranodonVaughn1958 Syn. Lower Permian United States of AmericaSynonym of MycterosaurusBathyglyptusCase1911 Syn. N/A N/ASynonym of DimetrodonBathygnathusLeidy1854 Valid. Lower Permian United States of AmericaBrachycnemiusWilliston1911 Syn. N/A N/ASynonym of EdaphosaurusCallibrachionBoule Glangeau1893Syn.N/AN/ASynonym of HaptodusCaseaWilliston1910 Valid. Lower Permian France and United States of AmericaCaseoidesOlson Beerbower1953 Valid. Lower Permian United States of AmericaCaseopsisOlson1962 Valid. Upper Permian United States of AmericaClepsydropsCope1875 Valid. Late Carboniferous United States of AmericaColobomycterVaughn1958Valid.Lower PermianUnited States of AmericaIt is a protorothyridid eureptileCotylorhynchusStovall1937 Valid. Lower Permian United States of AmericaCryptovenatorFröbisch Schoch Müller Schindler Schweiss2011Valid.Late CarboniferousGermanyCtenorhachisHook Hotton1991 Valid. Upper Permian United States of AmericaCtenospondylusRomer1936 Valid. Lower Permian United StatesCutleriaLewis Vaughn1965 Valid. Early Permian United States of AmericaDelorhynchusFox1962 Valid. Lower Permian United States of AmericaOriginally descript as a pelycosaur, but probably a parareptileDatheosaurusSchroeder1905Syn.N/AN/ASynonym of HaptodusDimacrodonOlson Beerbower1953Valid?Lower PermianUnited StatesOriginally descript as an anomodont therapsid by Olson & Beerbower (1953) and Olson (1962), it lacks any diagnostic features of anomodonts and rather represent pelycosaur-grade synapsidsDimetrodonCope1878 Valid. Early Permian - Middle Permian United States of America and Germany DiopaeusCope1892Syn.N/AN/ASynonym of OphiacodonEchinerpetonReisz1972 Valid. Upper Carboniferous CanadaEdaphosaurusCope1882 Valid. Late Carboniferous - Lower Permian Czech Republic and United States of AmericaElcabrosaurusCase1907 Syn. N/A N/ASynonym of SphenacodonElliotsmithiaBroom1937 Valid. Middle-Upper Permian South AfricaEmbolophorusCope1878 Syn. N/A N/ASynonym of DimetrodonEnnatosaurusEfremov1956 Valid. Lower Permian RussiaEothyrisRomer1937 Valid. Lower Permian United States of AmericaEumattheviaBroom1930Syn.N/AN/ASynonym of MycterosaurusEuromycterReisz Maddin Fröbisch Falconnet2011Valid.Early-Late PermianFranceGlaucosaurusWilliston1915 Valid. Lower Permian United States of AmericaHaptodusGaudry1866 Valid. Late Carboniferous - Lower Permian United States of America and EuropeHeleosaurusBroom1907Valid.Upper PermianSouth AfricaIanthasaurusReisz Berman1986 Valid. Late Carboniferous United States of AmericaIanthodonKissel Reisz2004Valid.Upper CarboniferousUnited States of AmericaIanthosaurusReisz Berman1986 Sic N/A N/AIncorrect spelling of IanthasaurusLupeosaurusRomer1937 Valid. Lower Permian United States of AmericaMacromerionFritsch1879 Valid. Upper Carboniferous GermanyMesenosaurusEfremov1938 Valid. Lower Permian RussiaMesonosaurusIvakhnenko Kurzanov1979SicN/AN/AIncorrect spelling of MesenosaurusMilosaurusDeMar1970 Valid. Upper Carboniferous United States of AmericaMycterosaurusWilliston1915 Valid. Lower Permian United States of AmericaNaosaurusCope1886 Syn. N/A N/ASynonym of EdaphosaurusNeosaurusNopsca1923 Valid. Lower Permian FranceNitosaurusRomer1937 Valid. Lower Permian United States of AmericaOedaleopsLangston1965 Valid. Lower Permian United States of AmericaOphiacodonMarsh1878 Valid. Late Carboniferous-Lower Permian United States of America and EnglandOromycterReisz2005 Valid. Lower Permian United States of AmericaOxyodonHuene1908 Preocc. N/A N/APreoccupied by fish genus Oxyodon . Synonym of SphenacodonPalaeohatteriaCredner1888 Valid. Early Permian GermanyPalaeosphenodonBaur1889Syn.N/AN/ASynonym of PalaeohatteriaPantelosaurusvon Huene1925 Valid. Early Permian GermanyPhreatophasmaEfremov1954 Valid. Middle Permian RussiaPoecilospondylusCase1910 Syn. N/A N/ASynonym of VaranosaurusPoliosaurusCase1907Syn.N/AN/ASynonym of OphiacodonProtoclepsydropsCarroll1964 Valid. Upper Carboniferous CanadaPyoziaAnderson Reisz2004 Valid. Middle Permian RussiaRuthenosaurusReisz Maddin Fröbisch Falconnet2011Valid.Early-Late PermianFranceRuthiromiaEberth Brinkman1983Valid.Lower PermianUnited States of AmericaScoliomusWilliston Case1915 Syn. Lower Permian United States of AmericaJunior synonym of SphenacodonSecodontosaurusRomer1936 Valid. Lower Permian United States of AmericaSphenacodonMarsh1878 Valid. Late Carboniferous-Early Permian United States of America and EnglandStereophallodonRomer1937 Valid. Late Carboniferous-Early Permian United States of AmericaStereorhachisGaudry1880 Valid. Late Carboniferous FranceTheropleuraCope1878 Syn. N/A N/ASynonym of Ophiacodon (in partium) and Dimetrodon (in partium)Therosaurusvon Huene1925Syn.N/AN/ASynonym of OphiacodonThrausmosaurusFox1962 Valid. Lower Permian United States of AmericaThe type species, T. serratidens, was declared to be a nomen dubiumTrichasaurusWilliston1913 Valid. Lower Permian United States of AmericaReplacement name for Trispondylus TrispondylusWilliston1910Preocc.N/AN/APreoccupied by phenacodontid Trispondylus VaranodonOlson1965 Valid. Lower Permian United States of AmericaVaranopsWilliston1911 Valid. Lower Permian United States of AmericaVaranosaurusBroili1904 Valid. Lower Permian United States of AmericaXyrospondylusReisz Heaton Pynn1982 Valid. Upper Carboniferous United States of AmericaWatongiaOlson1974 Valid. Middle Permian United States of AmericaWinfeldiaRomer1925Syn.N/AN/ASynonym of Ophiacodon

See also

List of prehistoric mammals List of therapsids Synapsid

References