Classification of the order Pelycosauria

Or. †Pelycosauria Cope 1878 [pelycosaur]
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G. †Echinerpeton Reisz 1972
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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]
G. †Lupeosaurus Romer 1936
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†Lupeosaurus kayi Romer 1937
G. †Milosaurus DeMar 1970
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†Milosaurus mccordi DeMar 1970
G. †Nitosaurus Romer 1937
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†Nitosaurus jacksonorum Romer 1937
Subor. †Ophiacodontia Romer and Price 1940
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Invalid names: Tetraceratopsidae Kuhn 1964 [empty], Varanopoidea Romer and Price 1940 [empty]
G. †Protoclepsydrops Carroll 1964
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†Protoclepsydrops haplous Carroll 1964
G. †Xyrospondylus Reisz et al. 1982
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†Xyrospondylus ecordi Peabody 1957
Invalid names: Caseamorpha Kemp 1982 [empty]