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. †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]