Classification of Welles and Gregg 1971

Cl. Reptilia Laurenti 1768 [reptile]
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Or. †Sauropterygia Owen 1859
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Subor. †Plesiosauria de Blainville 1835 [plesiosaur]
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Superfm. †Plesiosauroidea Welles 1943
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Fm. †Elasmosauridae Cope 1869 [elasmosaur]
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G. †Mauisaurus Hector 1874
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†Mauisaurus haasti Hector 1874
Invalid names: Plesiosaurus crassicostatus Owen 1870 [nomen vanum], Plesiosaurus holmesii Hector 1874 [nomen vanum], Plesiosaurus hoodii Owen 1870 [nomen vanum], Plesiosaurus mackayii Hector 1874 [nomen vanum]
Superor. Squamata Oppel 1811 [squamates]
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Or. Sauria MacCartney 1802
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Subor. Anguimorpha Fürbringer 1900
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Infraor. Platynota Baur 1890
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Superfm. †Varanoidea Gray 1827
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Fm. †Mosasauridae Gervais 1852 [mosasaur]
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Subfm. †Mosasaurinae Gervais 1853
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G. †Mosasaurus Parkinson 1822
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†Mosasaurus mokoroa Welles and Gregg 1971
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Invalid names: Leiodon haumuriensis Hector 1874 [synonym], Taniwhasaurus oweni Hector 1874 [synonym]
Subfm. †Plioplatecarpinae Dollo 1884
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G. †Prognathodon Dollo 1889
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†Prognathodon waiparaensis Welles and Gregg 1971
Subfm. †Tylosaurinae Wiliston 1895
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G. †Taniwhasaurus Hector 1874
G. †Tylosaurus Marsh 1872
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†Tylosaurus haumuriensis Hector 1874