Classification of Welles 1962

Or. †Plesiosauria de Blainville 1835 [plesiosaur]
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G. †Aristonectes Cabrera 1941
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†Aristonectes parvidens Cabrera 1941
G. †Brachauchenius Williston 1903
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†Brachauchenius lucasi Williston 1903
Fm. †Dolichorhynchopidae Welles 1962
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G. †Dolichorhynchops Williston 1902
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†Dolichorhynchops kirki Russell 1935
†Dolichorhynchops osborni Williston 1902
Invalid names: Cimoliasaurus leucoscopelus Etheridge, Jr. 1897 [nomen vanum], Piratosaurus plicatus Leidy 1865 [nomen vanum], Plesiosaurus ichthyospondylus Seeley 1869 [nomen vanum], Polycotylus dolichopus Williston 1906 [nomen vanum], Trinacromerum anonymum Williston 1903 [nomen vanum], Trinacromerum bentonianum Cragin 1888 [nomen vanum], Trinacromerum latimanus Williston 1908 [nomen vanum]
G. †Leptocleidus Andrews 1922
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†Leptocleidus superstes Andrews 1922
G. †Peyerus Stromer 1935
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†Peyerus capensis Andrews 1911
Invalid names: Polycotylus brevispondylus Bogolubov 1911 [nomen vanum], Polycotylus ichthyospondylus tanais Bogolubov 1911 [nomen vanum]
Superfm. †Plesiosauroidea Welles 1943
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Fm. †Elasmosauridae Cope 1869 [elasmosaur]
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Subfm. †Alzadasaurinae
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G. †Alzadasaurus Welles 1943
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†Alzadasaurus kansasensis Welles 1952
†Alzadasaurus pembertoni Welles and Bump 1949
†Alzadasaurus riggsi Welles 1943
G. †Aphrosaurus Welles 1943
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†Aphrosaurus furlongi Welles 1943
G. †Fresnosaurus Welles 1943
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†Fresnosaurus drescheri Welles 1943
G. †Hydralmosaurus Welles 1943
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G. †Hydrotherosaurus Welles 1943
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G. †Leurospondylus Brown 1913
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†Leurospondylus ultimus Brown 1913
G. †Morenosaurus Welles 1943
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†Morenosaurus stocki Welles 1943
G. †Ogmodirus Williston and Moodie 1913
G. †Styxosaurus Welles 1943
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†Styxosaurus browni Welles 1952
G. †Thalassomedon Welles 1943
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Subfm. †Elasmosaurinae
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G. †Brancasaurus Wegner 1914
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†Brancasaurus brancai Wegner 1914
G. †Elasmosaurus Cope 1868
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†Elasmosaurus morgani Welles 1949
Invalid names: Elasmosaurus marshii Williston 1906 [nomen vanum]
Invalid names: Alzadasaurus tropicus Colbert 1949 [nomen vanum], Cimoliasaurus andium Deecke 1895 [nomen vanum], Cimoliasaurus cantabrigiensis Lydekker 1889 [nomen vanum], Cimoliasaurus caudalis Hutton 1894 [nomen vanum], Elasmosaurus amalitskii Pravoslavlev 1916 [nomen vanum], Elasmosaurus ischiadicus Williston 1903 [nomen vanum], Elasmosaurus kurskensis Bogolubov 1911 [nomen vanum], Elasmosaurus nobilis Williston 1906 [nomen vanum], Elasmosaurus orskensis Bogolubov 1911 [nomen vanum], Elasmosaurus serdobensis Bogolubov 1911 [nomen vanum], Elasmosaurus snowii Williston 1890 [nomen vanum], Mauisaurus gardneri Seeley 1878 [nomen vanum], Ogmodirus martini Williston and Moodie 1917 [nomen vanum], Plesiosaurus constrictus Owen 1850 [nomen vanum], Plesiosaurus crassicostatus Owen 1870 [nomen vanum], Plesiosaurus gurgitis Renevier 1858 [nomen vanum], Plesiosaurus helmersenii Kiprijanoff 1882 [nomen vanum], Plesiosaurus hoodii Owen 1870 [nomen vanum], Plesiosaurus macrospondylus McCoy 1867 [nomen vanum], Plesiosaurus sutherlandi McCoy 1867 [nomen vanum], Pliosaurus gigas Schröder 1885 [nomen vanum], Woolungasaurus glendowerensis Persson 1960 [nomen dubium]
Fm. †Plesiosauridae Gray 1825
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G. †Muraenosaurus Seeley 1874
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†Muraenosaurus leedsii Seeley 1874
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Invalid names: Cryptocleidus cuervoi Torre and Rojas 1949 [synonym]
Invalid names: Plesiosaurus neogaeus Burmeister 1861 [nomen vanum]
Invalid names: Cimoliasaurus maccoyi Etheridge 1904 [nomen vanum]
Superfm. †Pliosauroidea Welles 1943
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Fm. †Pliosauridae Seeley 1874
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Invalid names: Kronosaurus queenslandicus Longman 1924 [nomen vanum]
Invalid names: Aptychodon cretaceus Reuss 1855 [nomen vanum], Brimosaurus grandis Leidy 1855 [nomen vanum], Cimoliasaurus limnophilus Koken 1887 [nomen vanum], Cimoliasaurus lissaensis Fritsch 1905 [nomen vanum], Cimoliasaurus magnus Leidy 1851 [nomen vanum], Cimoliasaurus teplicensis Fritsch 1907 [nomen vanum], Cimoliasaurus valdensis Lydekker 1889 [nomen vanum], Cimoliosaurus nazarowi Bogolubov 1911 [nomen vanum], Discosaurus planior Leidy 1870 [nomen vanum], Discosaurus vetustus Leidy 1851 [nomen vanum], Elasmosaurus intermedius Cope 1894 [nomen vanum], Elasmosaurus orientalis Cope 1869 [nomen vanum], Elasmosaurus sternbergi Williston 1906 [nomen vanum], Embaphias circulosus Cope 1894 [nomen vanum], Hunosaurus fasseli Fritsch 1905 [nomen vanum], Iserosaurus littoralis Fritsch 1905 [nomen vanum], Lutkesaurus Kiprijanoff 1883 [nomen nudum], Mauisaurus brachiolatus Hector 1874 [nomen vanum], Oligosimus grandaevus Leidy 1872 [nomen vanum], Orophosaurus pauciporus Cope 1887 [nomen vanum], Peloneustes kanzleri Koken 1905 [nomen vanum], Piptomerus hexagonus Cope 1887 [nomen vanum], Piptomerus megaloporus Cope 1887 [nomen vanum], Piptomerus microporus Cope 1887 [nomen vanum], Piratosaurus Leidy 1865 [nomen vanum], Plesiosaurus australis Owen 1861 [nomen vanum], Plesiosaurus balticus Schröder 1885 [nomen vanum], Plesiosaurus bernardi Owen 1850 [nomen vanum], Plesiosaurus brevifemur Cope 1875 [nomen vanum], Plesiosaurus chilensis Gay 1848 [nomen vanum], Plesiosaurus continuus Owen 1841 [nomen vanum], Plesiosaurus cycnodeirus Seeley 1869 [nomen nudum], Plesiosaurus degenhardti Koken 1887 [nomen vanum], Plesiosaurus euryspondylus Seeley 1869 [nomen nudum], Plesiosaurus gouldii Williston 1897 [nomen vanum], Plesiosaurus gulo Cope 1872 [nomen vanum], Plesiosaurus holmesii Hector 1874 [nomen vanum], Plesiosaurus latispinus Owen 1854 [nomen vanum], Plesiosaurus lockwoodii Cope 1869 [nomen vanum], Plesiosaurus mackayii Hector 1874 [nomen vanum], Plesiosaurus mauritanicus Arambourg 1952 [nomen vanum], Plesiosaurus mexicanus Wieland 1910 [nomen vanum], Plesiosaurus microdeirus Seeley 1869 [nomen nudum], Plesiosaurus mudgei Cragin 1894 [nomen vanum], Plesiosaurus neocomiensis Campiche 1860 [nomen vanum], Plesiosaurus nordmanni Eichwald 1869 [nomen vanum], Plesiosaurus ophiodeirus Seeley 1869 [nomen nudum], Plesiosaurus pachyomus Owen 1840 [nomen vanum], Plesiosaurus planus Owen 1864 [nomen vanum], Plesiosaurus planus trigonalis Owen 1864 [nomen vanum], Plesiosaurus platydeirus Seeley 1869 [nomen nudum], Plesiosaurus poecilospondylus Seeley 1869 [nomen nudum], Plesiosaurus smithii Owen 1884 [nomen vanum], Plesiosaurus traversii Hector 1874 [nomen vanum], Pliosaurus planus Hulke 1883 [nomen nudum], Polycotylus Cope 1869 [nomen vanum], Polycotylus donicus Pravoslavlev 1915 [nomen vanum], Polycotylus epigurgitis Bogolubov 1911 [nomen vanum], Polycotylus latipinnis Cope 1869 [nomen vanum], Polycotylus orientalis Bogolubov 1911 [nomen vanum], Polycotylus tenuis Hector 1874 [nomen vanum], Polycotylus ultimus Bogolubov 1911 [nomen vanum], Polyptychodon interruptus Owen 1841 [nomen vanum], Polyptychodon neocomiensis Schardt 1910 [nomen vanum], Stereosaurus cratynotus Seeley 1869 [nomen nudum], Stereosaurus platyomus Seeley 1869 [nomen vanum], Stereosaurus stenomus Seeley 1869 [nomen nudum], Trinacromerum Cragin 1888 [nomen vanum], Uronautes cetiformis Cope 1876 [nomen vanum]
G. †Mauisaurus Hector 1874
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†Mauisaurus haasti Hector 1874
Unr. Tetrapoda Jaekel 1911 [tetrapod]
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Invalid names: Nothosaurops occiduus Leidy 1870 [nomen vanum]
Unr. Tetrapoda Jaekel 1911 [tetrapod]
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Invalid names: Namuncurania malarguense Rusconi 1943 [nomen vanum], Plesiosaurus vaccinsulensis Cope 1876 [nomen vanum], Polyptychodon mackesoni Owen 1884 [nomen vanum], Polyptychodon patagonicus Ameghino 1893 [nomen vanum]