Classification of Olson and Beerbower 1953

Cl. Reptilia Laurenti 1768 [reptile]
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Subcl. Eureptilia Olson 1947 [eureptile]
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Or. †Captorhinomorpha Watson 1917
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Fm. †Captorhinidae Case 1911
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G. †Rothia Olson and Beerbower 1953
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†Rothia multidonta Olson and Beerbower 1953
Infracl. Synapsida Osborn 1903 [synapsid]
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Or. †Pelycosauria Cope 1878 [pelycosaur]
Or. Therapsida Broom 1905 [therapsid]
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Fm. †Dimacrodontidae Olson and Beerbower 1953
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G. †Dimacrodon Olson and Beerbower 1953
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†Dimacrodon hottoni Olson and Beerbower 1953
Or. †Pelycosauria Cope 1878 [pelycosaur]
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Subor. †Edaphosauria Cope 1882
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Fm. †Caseidae Williston 1911
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G. †Angelosaurus Olson and Beerbower 1953
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†Angelosaurus dolani Olson and Beerbower 1953
G. †Caseoides Olson and Beerbower 1953
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†Caseoides sanangeloensis Olson and Beerbower 1953
G. †Cotylorhynchus Stovall 1937
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†Cotylorhynchus hancocki Olson and Beerbower 1953
Subor. †Sphenacodontia Romer and Price 1940
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Fm. †Sphenacodontidae Marsh 1878
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G. †Steppesaurus Olson and Beerbower 1953
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†Steppesaurus gurleyi Olson and Beerbower 1953
Fm. †Tappenosauridae Olson and Beerbower 1953
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G. †Tappenosaurus Olson and Beerbower 1953
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†Tappenosaurus magnus Olson and Beerbower 1953