Classification of the family Polycotylidae
Fm. †Polycotylidae Williston 1908
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G. †Ceraunosaurus Thurmond 1968
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]
Subfm. †Polycotylinae Albright et al. 2007
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Unr. †Dolichorhynchia Clark et al. 2024
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G. †Dolichorhynchops Williston 1902
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†Dolichorhynchops herschelensis Sato 2005
Invalid names: Plesiosaurus ichthyospondylus Seeley 1869 [nomen vanum], Trinacromerum latimanus Williston 1908 [nomen vanum]
G. †Georgiasaurus Ochev 1977
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†Georgiasaurus penzensis Otschev 1976
Invalid names: Georgia Otschev 1976 [replaced]
G. †Polycotylus Cope 1869
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†Polycotylus sopozkoi Efimov et al. 2016
†Polycotylus suprajurensis Sauvage 1876
G. †Trinacromerum Cragin 1888
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†Trinacromerum bentonianum 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]