Classification of Thies et al. 1997

Cl. Reptilia Laurenti 1768 [reptile]
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Subcl. Archosauria Cope 1869 [archosaur]
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Or. Crocodylia Owen 1842 [crocodilian]
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Fm. †Atoposauridae Gervais 1871
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G. †Theriosuchus Owen 1878