Classification of Russell 1956

Cl. Reptilia Laurenti 1768 [reptile]
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Subor. Eosuchia Broom 1914
Or. †Choristodera Cope 1876 [choristodere]
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G. †Champsosaurus Cope 1876
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†Champsosaurus natator Parks 1933
Or. Eosuchia Broom 1914
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Subor. †Choristodera Cope 1876 [choristodere]