Classification of Gao and Fox 1998
Cl. Reptilia Laurenti 1768 [reptile]
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Subcl. Diapsida Osborn 1903 [diapsid]
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Or. †Choristodera Cope 1876 [choristodere]
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Fm. †Champsosauridae Cope 1876 [champsosaur]
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G. †Champsosaurus Cope 1876
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†Champsosaurus albertensis Parks 1927
†Champsosaurus ambulator Brown 1905
†Champsosaurus gigas Erickson 1972
†Champsosaurus laramiensis Brown 1905
†Champsosaurus lindoei Gao and Fox 1998
†Champsosaurus natator Parks 1933
†Champsosaurus tenuis Erickson 1981
Invalid names: Champsosaurus annectens Cope 1876 [nomen vanum], Champsosaurus australis Cope 1881 [nomen vanum], Champsosaurus brevicollis Cope 1876 [nomen vanum], Champsosaurus inelegans Parks 1933 [nomen vanum], Champsosaurus inflatus Parks 1933 [nomen vanum], Champsosaurus profundus Cope 1876 [nomen vanum], Champsosaurus puercensis Cope 1882 [nomen vanum], Champsosaurus saponensis Cope 1882 [nomen vanum], Champsosaurus vaccinsulensis Cope 1876 [nomen vanum]
Fm. †Cteniogenidae Seiffert 1975
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