Classification of the order Pelycosauria
Or. †Pelycosauria Cope 1878 [pelycosaur]
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Subor. †Edaphosauria Cope 1882
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Invalid names: Glaucosauridae Huene 1925 [empty], Lupeosauridae Romer and Price 1940 [empty], Nitosauridae Romer and Price 1940 [empty]
Subor. †Ophiacodontia Romer and Price 1940
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Invalid names: Tetraceratopsidae Kuhn 1964 [empty], Varanopoidea Romer and Price 1940 [empty]
Invalid names: Caseamorpha Kemp 1982 [empty]