Classification of Olson 1966

Cl. Reptilia Laurenti 1768 [reptile]
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Subcl. Anapsida Williston 1917 [anapsid]
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Or. †Captorhinomorpha Watson 1917
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G. †Captorhinus Cope 1896
G. †Labidosaurus Cope 1896
Subor. †Pareiasauria Seeley 1888
Or. †Procolophonia Seeley 1888
Subcl. Diapsida Osborn 1903 [diapsid]
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Infracl. Archosauria Cope 1869 [archosaur]
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Or. †Thecodontia Owen 1859
Infracl. Lepidosauria Haeckel 1866 [lepidosaur]
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Or. Eosuchia Broom 1914
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Fm. †Millerettidae Romer 1956
Fm. †Younginidae Broom 1914
Or. Rhynchocephalia Günther 1867 [rhynchocephalian]
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Fm. †Rhynchosaurida Cope 1871
Subcl. Synapsida Osborn 1903 [synapsid]
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Or. †Pelycosauria Cope 1878 [pelycosaur]
Or. Theriodonta Owen 1876
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Subor. †Anomodontia Owen 1859
Infraor. Cynodontia Owen 1861 [cynodont]
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Invalid names: Gomphodontidae [empty]
Subor. †Gorgonopsia Seeley 1894
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Fm. †Phthinosuchidae Efremov 1954
Infraor. †Therocephalia Broom 1903
Subor. †Tritylodontia Olson 1966
Cl. Mammalia Linnaeus 1758 [mammal]
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Subcl. †Allotheria Marsh 1880
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Or. †Multituberculata Cope 1884 [multituberculate]
Or. †Docodonta Kretzoi 1946 [dodocont]
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Fm. †Morganucodontidae Kuehne 1958
Or. Placentalia Owen 1837 [placental]
Or. †Symmetrodonta Simpson 1925 [symmetrodont]
Subcl. Theria Parker and Haswell 1897
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Or. Marsupialia Illiger 1811 [marsupial]
Or. †Pantotheria Marsh 1880
Or. †Triconodonta Osborn 1888 [triconodont]
Or. †Pelycosauria Cope 1878 [pelycosaur]
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Subor. †Caseosauria Williston 1912
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Fm. †Caseidae Williston 1911
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G. †Cotylorhynchus Stovall 1937
Subor. †Edaphosauria Cope 1882
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G. †Edaphosaurus Cope 1882
Subor. †Ophiacodontia Romer and Price 1940
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G. †Ophiacodon Marsh 1878
Subor. †Sphenacodontia Romer and Price 1940
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G. †Dimetrodon Cope 1878