Classification of the family Elasmosauridae
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. †Ogmodirus Williston and Moodie 1913
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Invalid names: Ogmodirus martinii Williston and Moodie 1917 [nomen dubium]
G. †Callowayosaurus
G. †Cimoliasaurus Leidy 1851
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†Cimoliasaurus magnus Leidy 1851
†Cimoliosaurus laramiensis Knight 1900
†Cimoliosaurus magnus Leidy 1851
†Cimoliosaurus snowii Williston 1890
Invalid names: Brimosaurus grandis Leidy 1855 [nomen dubium], Cimoliasaurus brevior Lydekker 1889 [nomen dubium], Cimoliasaurus maccoyi Etheridge 1904 [nomen dubium], Hunosaurus Fritsch 1905 [synonym], Iserosaurus Fritsch 1905 [synonym]
G. †Eromangasaurus Kear 2005
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†Eromangasaurus australis Sachs 2005
†Eromangasaurus carinognathus Kear 2005
Unr. †Euelasmosaurida O'Gorman 2019
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Unr. †Elasmosaurinae
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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], Thalassonomosaurus marshii Williston 1906 [nomen dubium]
Invalid names: Styxosaurinae Otero 2016 [synonym]
G. †Libonectes Carpenter 1997 [southwest diver]
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G. †Thalassomedon Welles 1943
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G. †Jucha Fischer et al. 2020
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†Jucha squalea Fischer et al. 2020
†Jucha squalea Fischer et al. 2020
†Jucha squalea Fischer et al. 2020
G. †Scanisaurus Persson 1960
G. †Stereosaurus Seeley 1869
G. †Thalassiosaurus Welles 1943
G. †Thalassonomosaurus Welles 1943
G. †Wapuskanectes Druckenmiller and Russell 2006
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†Wapuskanectes betsynichollsae Druckenmiller and Russell 2006
Unr. †Weddellonectia O'Gorman and Coria 2017
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Subfm. †Aristonectinae Otero et al. 2012
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G. †Aristonectes Cabrera 1941
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†Aristonectes parvidens Cabrera 1941
†Aristonectes quiriquinensis Otero et al. 2014
Invalid names: Turneria Chatterjee and Small 1989 [synonym]
G. †Morturneria Chatterjee and Creisler 1994
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†Morturneria seymourensis Chatterjee and Creisler 1994
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Invalid names: Turneria seymourensis Chatterjee and Small 1989 [replaced]
Invalid names: Mauisaurus Hector 1874 [nomen dubium], Mauisaurus haasti Hector 1874 [nomen dubium], Tuarangisaurus cabazai Gasparini et al. 2003 [nomen dubium]
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], 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 Schröder 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]