Classification of the clade Plesiosauria

Plesiosauria de Blainville 1835 [plesiosaur]
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G. †Aptychodon Reuss 1855
G. †Bathyspondylus Delair 1982
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G. †Embaphias Cope 1894
G. †Eoplesiosaurus Benson et al. 2012
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Eoplesiosaurus antiquior Benson et al. 2012
G. †Eretmosaurus Seeley 1874
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Eretmosaurus dubius Tate and Blake 1876
Eretmosaurus rugosus Owen 1840
G. †Gymocetus Romer 1966
G. †Hexatarsostinus Hawkins 1840
G. †Namuncurania Rusconi 1943
G. †Nothosaurops Leidy 1870
G. †Orophosaurus Cope 1851
Superfm. †Plesiosauroidea Welles 1943
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Cryptoclidia Ketchum and Benson 2010
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Fm. †Cryptoclididae Williston 1925
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G. †Abyssosaurus Berezin 2011
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Abyssosaurus nataliae Berezin 2011
G. †Colymbosaurus Seeley 1874
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Colymbosaurus sclerodirus Bogolubov 1911
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Invalid names: Colymbosaurus megadeirus Seeley 1869 [synonym], Plesiosaurus manselii Hulke 1870 [synonym], Pliosaurus portlandicus Owen 1869 [synonym]
G. †Cryptoclidus Seeley 1892
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Cryptocleidus cuervoi caroli Torre and Rojas 1949
Cryptoclidus eurymerus Phillips 1871
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Invalid names: Apractocleidus teretipes Smellie 1915 [synonym], Cryptoclidus platymerus Seeley 1892 [synonym], Plesiosaurus durobrivensis Seeley 1892 [synonym]
Cryptoclidus richardsoni Lydekker 1889
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Invalid names: Plesiosaurus plicatus Mansel-Pleydell 1888 [synonym]
Invalid names: Apractocleidus Smellie 1915 [objective synonym], Cryptocleidus cuervoi Torre and Rojas 1949 [nomen dubium], Cryptoclidus vignalensis Torre and Cuervo 1939 [nomen dubium], Plesiosaurus oxfordiensis Seeley 1869 [nomen nudum], Plesiosaurus oxoniensis Phillips 1871 [nomen dubium]
G. †Djupedalia Knutsen et al. 2012
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Djupedalia engeri Knutsen et al. 2012
G. †Kimmerosaurus Brown 1981
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Kimmerosaurus langhami Brown 1981
G. †Muraenosaurus Seeley 1874
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Muraenosaurus fahrenkohli Waldheim 1846
Muraenosaurus leedsii Seeley 1874
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Invalid names: Cimoliosaurus plicatus Phillips 1871 [synonym], Muraenosaurus platyclis Seeley 1892 [synonym], Muraenosaurus plicatus Phillips 1871 [synonym], Tremamesacleis durobrivensis Lydekker 1889 [synonym]
Muraenosaurus purbecki Bogolubov 1911
Invalid names: Tremamesacleis White 1940 [synonym]
G. †Pantosaurus Marsh 1893
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Pantosaurus striatus Marsh 1891
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Invalid names: Muraenosaurus reedii Mehl 1912 [synonym]
Invalid names: Parasaurus Marsh 1891 [replaced]
G. †Picrocleidus Andrews 1909
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Picrocleidus beloclis Seeley 1892
G. †Spitrasaurus Knutsen et al. 2012
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Spitrasaurus larseni Knutsen et al. 2012
Spitrasaurus wensaasi Knutsen et al. 2012
G. †Tatenectes O'Keefe and Wahl, Jr. 2003
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Tatenectes laramiensis Knight 1900
G. †Tricleidus Andrews 1909
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Tricleidus seeleyi Andrews 1909
G. †Vinialesaurus Gasparini et al. 2002
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Vinialesaurus caroli Torre and Rojas 1949
Invalid names: Cryptoclidus aldingeri von Huene 1932 [nomen dubium]
Xenopsaria Benson and Druckenmiller 2014
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Fm. †Elasmosauridae Cope 1869 [elasmosaur]
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G. †Alexeyisaurus Sennikov and Arkhangelsky 2010
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Alexeyisaurus karnoushenkoi Sennikov and Arkhangelsky 2010
Subfm. †Alzadasaurinae
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G. †Alzadasaurus 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. †Morenosaurus Welles 1943
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Morenosaurus stocki Welles 1943
G. †Ogmodirus Williston and Moodie 1913
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Invalid names: Ogmodirus martinii Williston and Moodie 1917 [nomen dubium]
Aristonectinae Otero et al. 2012
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G. †Alexandronectes Otero et al. 2016
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Alexandronectes zealandiensis Otero et al. 2016
G. †Aristonectes Cabrera 1941
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Aristonectes parvidens Cabrera 1941
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Invalid names: Turneria seymouriensis Chatterjee and Creisler 1994 [synonym]
Aristonectes quiriquiensis Otero et al. 2014
Invalid names: Turneria Chatterjee and Small 1989 [synonym]
G. †Futabasaurus Sato et al. 2006
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Futabasaurus suzukii Sato et al. 2006 [Futaba Suzuki Ryu]
G. †Kaiwhekea Cruickshank and Fordyce 2002
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Kaiwhekea katiki Cruickshank and Fordyce 2002
Invalid names: Tuarangisaurus cabazai Gasparini et al. 2003 [nomen dubium]
G. †Callawayasaurus Carpenter 1999
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G. †Cardiocorax Araújo et al. 2015
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Cardiocorax mukulu Araújo et al. 2015
G. †Cimoliasaurus Leidy 1851
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Cimoliasaurus magnus Leidy 1851
Cimoliosaurus magnus Leidy 1852
Cimoliosaurus snowii Williston 1890
Invalid names: Brimosaurus grandis Leidy 1855 [nomen dubium], Cimoliasaurus brevior Lydekker 1889 [nomen dubium], Cimoliasaurus maccoyi Etheridge 1904 [nomen dubium], Discosaurus Leidy 1851 [synonym], Hunosaurus Fritsch 1905 [synonym], Iserosaurus Fritsch 1905 [synonym], Oligosimus Leidy 1872 [synonym], Piptomerus Cope 1887 [synonym]
G. †Eromangasaurus Kear 2005
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G. †Gronausaurus Hampe 2013
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Gronausaurus wegneri Hampe 2013
G. †Hydrotherosaurus Welles 1943
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G. †Kawanectes O'Gorman 2016
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Kawanectes lafquenianum Gasparini and Goni 1985
G. †Leurospondylus Brown 1913
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Leurospondylus ultimus Brown 1913
G. †Libonectes Carpenter 1997 [southwest diver]
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Libonectes morgani Welles 1949
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Invalid names: Libonectes atlasense Buchy 2005 [synonym]
G. †Mauisaurus Hector 1874
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Mauisaurus haasti Hector 1874
Mauisaurus haastii Hector 1874
G. †Scanisaurus Persson 1960
G. †Stereosaurus Seeley 1869
Subfm. †Styxosaurinae Otero 2016
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G. †Albertonectes Kubo et al. 2012
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Albertonectes vanderveldei Kubo et al. 2012
G. †Elasmosaurus Cope 1868
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Elasmosaurus marshi Williston 1906
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Invalid names: Discosaurus carinatus Cope 1868 [objective synonym]
G. †Nakonanectes Serratos et al. 2017
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Nakonanectes bradti Serratos et al. 2017
G. †Styxosaurus Welles 1943
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Styxosaurus browni Welles 1952
Styxosaurus snowii Williston 1890
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Invalid names: Alzadasaurus pembertoni Welles and Bump 1949 [synonym]
Invalid names: Hydralmosaurus Welles 1943 [synonym], Hydralmosaurus serpentinus Cope 1877 [nomen dubium], Thalassonomosaurus marshii Williston 1906 [nomen dubium]
G. †Terminonatator Sato 2003
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G. †Thalassiosaurus Welles 1943
G. †Thalassomedon Welles 1943
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Invalid names: Alzadasaurus riggsi Welles 1943 [synonym]
G. †Thalassonomosaurus Welles 1943
G. †Tuarangisaurus Wiffen and Moisley 1986
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Tuarangisaurus keyesi Wiffen and Moisley 1986
G. †Vegasaurus O'Gorman et al. 2015
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Vegasaurus molyi O'Gorman et al. 2015
G. †Wapuskanectes Druckenmiller and Russell 2006
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Wapuskanectes betsynichollsae Druckenmiller and Russell 2006
G. †Zarafasaura Vincent et al. 2011
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Zarafasaura oceanis Vincent et al. 2011
Invalid names: Alzadasaurus kansasensis Welles 1952 [nomen dubium], Alzadasaurus tropicus Colbert 1949 [nomen vanum], Cimoliasauridae Delair 1959 [synonym], Cimoliasaurus andium Deecke 1895 [nomen dubium], Cimoliasaurus cantabrigiensis Lydekker 1889 [nomen vanum], Cimoliasaurus caudalis Hutton 1894 [nomen vanum], Elasmosaurinae [empty], Elasmosaurus amalitskii Pravoslavlev 1916 [nomen vanum], Elasmosaurus kurskensis Bogolubov 1911 [nomen vanum], Elasmosaurus orskensis Bogolubov 1911 [nomen vanum], Elasmosaurus serdobensis Bogolubov 1911 [nomen vanum], Elasmosaurus sternbergi Williston 1906 [nomen dubium], Mauisaurus gardneri Seeley 1878 [nomen vanum], Plesiosaurus constrictus Owen 1850 [nomen vanum], Plesiosaurus crassicostatus Owen 1870 [nomen vanum], Plesiosaurus gulo Cope 1872 [nomen dubium], Plesiosaurus gurgitis Renevier 1858 [nomen vanum], Plesiosaurus helmersenii Kiprijanoff 1882 [nomen vanum], Plesiosaurus holmesii Hector 1874 [nomen vanum], Plesiosaurus hoodii Owen 1870 [nomen vanum], Plesiosaurus mackayii Hector 1874 [nomen vanum], Plesiosaurus mauritanicus Arambourg 1952 [nomen dubium], Plesiosaurus sutherlandi McCoy 1867 [nomen dubium], Pliosaurus gigas Schroder 1885 [nomen vanum], Pliosaurus macrospondylus McCoy 1867 [nomen dubium], Thalassiosaurus ischiadicus Williston 1903 [nomen dubium], Thalassonomosaurus nobilis Williston 1906 [nomen dubium], Woolungasaurus Persson 1960 [nomen dubium], Woolungasaurus glendowerensis Persson 1960 [nomen dubium]
Leptocleidia Ketchum and Benson 2010
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Fm. †Leptocleididae White 1940
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G. †Brancasaurus Wegner 1914
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Brancasaurus brancai Wegner 1914
G. †Hastanectes Benson et al. 2013
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Hastanectes valdensis Lydekker 1889
G. †Leptocleidus Andrews 1922
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Leptocleidus capensis Andrews 1911
Leptocleidus clemai Cruickshank and Long 1997
Leptocleidus superstes Andrews 1922
Invalid names: Peyerus Stromer 1935 [synonym]
G. †Nichollssaura Druckenmiller and Russell 2009
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Nichollssaura borealis Druckenmiller and Russell 2009
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Invalid names: Nichollsia borealis Druckenmiller and Russell 2008 [replaced]
Invalid names: Nichollsia Druckenmiller and Russell 2008 [replaced]
G. †Umoonasaurus Kear et al. 2006
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Umoonasaurus demoscyllus Kear et al. 2006
G. †Vectocleidus Benson et al. 2013
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Vectocleidus pastorum Benson et al. 2013
Fm. †Polycotylidae Williston 1908
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G. †Ceraunosaurus Thurmond 1968
G. †Dolichorhynchops Williston 1902
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Dolichorhynchops osborni Williston 1902
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Invalid names: Polycotylus osborni Watson 1951 [synonym]
Dolichorhynchops tropicensis Schmeisser McKean 2012
Invalid names: Plesiosaurus ichthyospondylus Seeley 1869 [nomen vanum], Trinacromerum latimanus Williston 1908 [nomen vanum]
G. †Edgarosaurus Druckenmiller 2002
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Edgarosaurus muddi Druckenmiller 2002
G. †Eopolycotylus Albright et al. 2007
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Eopolycotylus rankini Albright et al. 2007
G. †Georgiasaurus Ochev 1977
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Georgiasaurus penzensis Otschev 1976
G. †Manemergus Buchy et al. 2005
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Manemergus anguirostris Buchy et al. 2005
G. †Pahasapasaurus Schumacher 2007
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Pahasapasaurus haasi Schumacher 2007
Subfm. †Palmulainae Albright et al. 2007
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G. †Palmulasaurus Albright et al. 2007
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Palmulasaurus quadratus Albright et al. 2007
Invalid names: Palmula Albright et al. 2007 [replaced]
G. †Piratosaurus Leidy 1865
G. †Plesiopleurodon Carpenter 1996
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Plesiopleurodon wellesi Carpenter 1996
Subfm. †Polycotylinae Albright et al. 2007
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G. †Polycotylus Cope 1869
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Invalid names: Polycotylus dolichopus Williston 1906 [synonym]
Polycotylus suprajurensis Sauvage 1876
G. †Sulcusuchus Gasparini and Spalletti 1990
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Sulcusuchus erraini Gasparini and Spalletti 1990
G. †Thililua Bardet et al. 2003
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Thililua longicollis Bardet et al. 2003
G. †Trinacromerum Cragin 1888
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Invalid names: Ceraunosaurus brownorum Thurmond 1968 [synonym], Trinacromerum anonymum Williston 1903 [synonym], Trinacromerum willistoni Riggs 1944 [synonym]
Trinacromerum kirki Russell 1935
Invalid names: Cimoliasaurus leucoscopelus Etheridge, Jr. 1897 [nomen dubium], Dolichorhynchopidae Welles 1962 [synonym], Palmulasaurinae Albright et al. 2007 [empty], Polycotyilnae Albright et al. 2007 [empty]
Invalid names: Leptocleidoidea Druckenmiller and Russell 2008 [replaced]
Invalid names: Cryptocleidoidea Williston 1925 [replaced]
Fm. †Microcleididae Benson et al. 2012
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G. †Microcleidus Watson 1909
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Microcleidus macropterus Seeley 1865
Microcleidus tournemirensis Sciau et al. 1990
Invalid names: Occitanosaurus Bardet et al. 1999 [synonym]
G. †Seeleyosaurus White 1940
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Invalid names: Seeleyosaurus holzmadensis White 1940 [synonym]
G. †Opallionectes Kear 2006
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G. †Plesiopterys O'Keefe 2004
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Plesiopterys wildi O'Keefe 2004
Fm. †Plesiosauridae Gray 1825
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G. †Hydrorion Grossmann 2007
G. †Lusonectes Smith et al. 2012
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Lusonectes sauvagei Smith et al. 2012
G. †Thaumatosaurus Meyer 1841
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Invalid names: Liopleurodon bucklandi Sauvage 1873 [synonym]
Invalid names: Brancasauridae White 1940 [synonym], Muraenosauridae White 1940 [synonym], Plesiosaurus neogaeus Burmeister 1861 [nomen vanum], Tremamesacleididae White 1940 [synonym]
G. †Plesiosaurus de la Beche and Conybeare 1821
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Plesiosaurus bavaricus Dames 1895
Plesiosaurus bitractensis Sauvage 1883
Plesiosaurus carinatus Cuvier 1824
Plesiosaurus cliduchus Seeley 1865
Plesiosaurus costatus Owen 1840
Plesiosaurus dolichodeirus Conybeare 1824
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Invalid names: Plesiosaurus homei Gray 1831 [synonym], Plesiosaurus macromus Owen 1840 [synonym], Plesiosaurus priscus Parkinson 1822 [synonym]
Plesiosaurus exarsostinus Hawkins 1834
Plesiosaurus grandis Owen 1840
Plesiosaurus hesternus Welles 1953
Plesiosaurus houzeaui Dollo 1909
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Invalid names: Plesiosaurus brachycephalus Owen 1840 [synonym]
Plesiosaurus macrodeirus Seeley 1869
Plesiosaurus nitidus Phillips 1871
Plesiosaurus trigonus Cuvier 1824
Invalid names: Plesiosaurus mexicanus Wieland 1910 [nomen dubium]
G. †Sthenarosaurus Watson 1909
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Sthenarosaurus dawkinsi Watson 1909
G. †Westphaliasaurus Schwermann and Sander 2011
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Westphaliasaurus simonsensii Schwermann and Sander 2011
Invalid names: Cimoliosaurus limnophilus Koken 1887 [nomen dubium], Dolichodeira Seeley 1892 [synonym], Euplesiosauria O'Keefe 2001 [empty]
Fm. †Pliosauridae Seeley 1874
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G. †Arminisaurus Sachs and Kear 2017
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Arminisaurus schuberti Sachs and Kear 2017
G. †Attenborosaurus Bakker 1993
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Invalid names: Plesiosaurus laticeps Owen 1867 [synonym]
G. †Cryonectes Vincent et al. 2013
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Cryonectes neustriacus Vincent et al. 2013
G. †Hauffiosaurus O'Keefe 2001
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Hauffiosaurus longirostris Tate and Blake 1876
Hauffiosaurus tomistomimus Benson et al. 2011
Hauffiosaurus zanoni O'Keefe 2001
G. †Marmornectes Ketchum and Benson 2011
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Marmornectes candrewi Ketchum and Benson 2011
G. †Megalneusaurus Knight 1898
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Megalneusaurus rex Knight 1895
G. †Pachycostasaurus Cruickshank et al. 1996
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Pachycostasaurus dawni Cruickshank et al. 1996
G. †Sinopliosaurus Young 1944
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G. †Stenorhynchosaurus Páramo-Fonseca et al. 2016
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Stenorhynchosaurus munozi Páramo-Fonseca et al. 2016
G. †Strongylokrotaphus Novozhilov 1964
G. †Thalassiodracon Storrs and Taylor 1996
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Invalid names: Plesiosaurus eleutheraxon Seeley 1865 [synonym], Plesiosaurus etheridgei Huxley 1858 [synonym], Plesiosaurus etheridgii Huxley 1858 [synonym]
Invalid names: Plesiosaurus hexatarsostinus Hawkins 1840 [nomen oblitum], Plesiosaurus pentetarsostinus Hawkins 1834 [nomen oblitum], Plesiosaurus triatarsostinus Hawkins 1834 [nomen oblitum]
Thalassophonea Benson and Druckenmiller 2014
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Subfm. †Brachaucheninae Williston 1925
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G. †Brachauchenius Williston 1903
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Brachauchenius lucasi Williston 1903
G. †Kronosaurus Longman 1924
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Kronosaurus boyacensis Hampe 1992
G. †Luskhan Fischer et al. 2017
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Luskhan itilensis Fischer et al. 2017
G. †Megacephalosaurus Schumacher et al. 2013
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Megacephalosaurus eulerti Schumacher et al. 2013
G. †Gallardosaurus Gasparini 2009
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Gallardosaurus iturraldei Gasparini 2009
G. †Liopleurodon Sauvage 1873
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Liopleurodon ferox Sauvage 1873
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Invalid names: Thaumatosaurus mosquensis Kiprijanoff 1883 [synonym]
Liopleurodon pachydeirus Seeley 1869
G. †Makhaira Fischer et al. 2015
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Makhaira rossica Fischer et al. 2015
G. †Peloneustes Lydekker 1889
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Peloneustes philarchus Seeley 1869
G. †Pliosaurus Owen 1841
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Pleiosaurus macromerus Phillips 1871
Pliosaurus andrewsi Tarlo 1960
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Invalid names: Peloneustes sterrodeirus Seeley 1869 [synonym]
Pliosaurus carpenteri Benson et al. 2013
Pliosaurus funkei Knutsen et al. 2012
Pliosaurus gamma Phillips 1871
Pliosaurus grandis Owen 1840
Pliosaurus grossouvrei Sauvage 1873
Pliosaurus kevani Benson et al. 2013
Pliosaurus patagonicus Gasparini and O'Gorman 2014
Pliosaurus phosphaticus Stefano 1903
Pliosaurus rossicus Novozhilov 1948
Pliosaurus westburyensis Benson et al. 2013
Invalid names: Cetiosaurus rigauxi Sauvage 1874 [nomen dubium], Ischyrodon Merian 1838 [synonym], Plesiosaurus giganteus Conybeare 1824 [nomen oblitum], Pliosaurus irgisensis Novozhilov 1948 [nomen dubium], Pliosaurus portentificus Noè et al. 2004 [nomen dubium], Spondylosaurus Fischer 1845 [synonym], Stretosaurus Tarlo 1959 [synonym]
G. †Simolestes Andrews 1909
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Simolestes indicus Lydekker 1877
Simolestes keileni Godefroit 1994
Simolestes vorax Andrews 1909
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Invalid names: Thaumatosaurus calloviensis Bogolubov 1912 [synonym]
Invalid names: Pliosaurus brachyspondylus Owen 1840 [nomen dubium], Pliosaurus macromerus Phillips 1871 [nomen dubium]
Invalid names: Pliosaurus aequalis Phillips 1871 [nomen dubium], Pliosaurus evansi Seeley 1869 [nomen dubium], Simolestinae Nopcsa 1923 [empty]
Superfm. †Pliosauroidea Welles 1943
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Fm. †Trinacromeridae Nopcsa 1923
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G. †Georgia Otschev 1976
Invalid names: Brachydeira Seeley 1892 [synonym]
G. †Rhaeticosaurus Wintrich et al. 2017
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Rhaeticosaurus mertensi Wintrich et al. 2017
Fm. †Rhomaleosauridae Nopcsa 1928
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G. †Anningasaura Vincent and Benson 2012
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Anningasaura lymense Vincent and Benson 2012
G. †Archaeonectrus Novozhilov 1964
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G. †Avalonnectes Benson et al. 2012
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Avalonnectes arturi Benson et al. 2012
G. †Bishanopliosaurus Dong 1980
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Bishanopliosaurus zigongensis Gao et al. 2004
G. †Borealonectes Sato and Wu 2008
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Borealonectes russelli Sato and Wu 2008
G. †Eurycleidus Andrews 1922
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Eurycleidus arcuatus Owen 1840
G. †Macroplata Swinton 1930
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Macroplata tenuiceps Swinton 1930
G. †Maresaurus Gasparini 1997
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Maresaurus coccai Gasparini 1997
G. †Meyerasaurus Smith and Vincent 2010
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Meyerasaurus victor Fraas 1910
G. †Rhomaleosaurus Seeley 1874
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Rhomaleosaurus cramptoni Carte and Baily 1863
Rhomaleosaurus megacephalus Stutchbury 1846
Rhomaleosaurus zetlandicus Phillips 1854
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Invalid names: Plesiosaurus propinquus Tate and Blake 1876 [synonym], Rhomaleosaurus thorntoni Andrews 1922 [synonym]
G. †Thaumatodracon Smith and Araújo 2017
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Thaumatodracon wiedenrothi Smith and Araújo 2017
G. †Yuzhoupliosaurus Zhang 1985
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Invalid names: Thaumatosauridae Romer 1956 [synonym]
G. †Stratesaurus Benson et al. 2012
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Stratesaurus taylori Benson et al. 2012
G. †Sulmosaurus Huene 1952
G. †Taphrosaurus Cope 1870
G. †Uronautes Cope 1876
Invalid names: Aptychodon cretaceus Reuss 1855 [nomen vanum], Cimoliasaurus lissaensis Fritsch 1905 [nomen vanum], Cimoliasaurus teplicensis Fritsch 1907 [nomen vanum], Cimoliosaurus nazarowi Bogolubov 1911 [nomen vanum], Cimoliosaurus smithi Owen 1884 [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], 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], Neoplesiosauria Ketchum and Benson 2010 [empty], 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 plicatus Leidy 1865 [nomen dubium], Plesiosaurus affinis Owen 1840 [nomen dubium], Plesiosaurus australis Owen 1861 [nomen vanum], Plesiosaurus balticus Schoder 1885 [nomen vanum], Plesiosaurus bernardi Owen 1850 [nomen vanum], Plesiosaurus brachistospondylus Hulke 1870 [nomen dubium], Plesiosaurus brevifemur Cope 1875 [nomen vanum], Plesiosaurus brevis Owen 1854 [nomen dubium], Plesiosaurus continuus Owen 1841 [nomen vanum], Plesiosaurus cycnodeirus Seeley 1869 [nomen nudum], Plesiosaurus degenhardti Koken 1887 [nomen vanum], Plesiosaurus ellipsospondylus Phillips 1871 [nomen dubium], Plesiosaurus euryspondylus Seeley 1869 [nomen nudum], Plesiosaurus gouldii Williston 1897 [nomen vanum], Plesiosaurus hexagonalis Phillips 1871 [nomen dubium], Plesiosaurus infraplanus Phillips 1871 [nomen dubium], Plesiosaurus latispinus Owen 1854 [nomen vanum], Plesiosaurus levis Owen 1854 [nomen dubium], Plesiosaurus lockwoodii Cope 1869 [nomen vanum], Plesiosaurus megapleuron Owen 1854 [nomen dubium], 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 phillipsi Sauvage 1871 [nomen dubium], Plesiosaurus planispondylus Damon 1860 [nomen nudum], 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 shirleyensis Knight 1900 [nomen dubium], Plesiosaurus subdepressus Owen 1854 [nomen nudum], Plesiosaurus traversii Hector 1874 [nomen vanum], Plesiosaurus truncatus Owen 1854 [nomen dubium], Plesiosaurus validus Phillips 1871 [nomen dubium], Plesiosaurus winspitensis Seeley 1871 [nomen dubium], Pliosaurus planus Hulke 1883 [nomen nudum], Plistosauroidea Edinger 1935 [empty], Polycotylus donicus Pravoslavlev 1915 [nomen vanum], Polycotylus epigurgitis Bogolubov 1911 [nomen vanum], Polycotylus orientalis Bogolubov 1911 [nomen vanum], Polycotylus tenuis Hector 1874 [nomen vanum], Polycotylus ultimus Bogolubov 1911 [nomen vanum], Polyptychodon 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], Uronautes cetiformis Cope 1876 [nomen vanum]