Classification of Spindler et al. 2015

Unr. Synapsida Osborn 1903 [synapsid]
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Unr. †Eupelycosauria Kemp 1982
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Unr. †Sphenacomorpha Ivakhnenko 2003
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Unr. †Sphenacodontia Romer and Price 1940
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G. †Cutleria Lewis and Vaughn 1965
G. †Ianthodon Kissel and Reisz 2004
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Ianthodon schultzei Kissel and Reisz 2004
Unr. †Haptodontiformes Spindler 2015
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G. †Haptodus Gaudry 1886