Classification of Brink 1951
†Lystrosaurus murrayi Huxley 1859
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Invalid names: Lystrosaurus frontosus Cope 1870 [synonym], Lystrosaurus jeppei Van Hoepen 1916 [synonym], Lystrosaurus jorisseni Van Hoepen 1916 [synonym], Lystrosaurus theileri Van Hoepen 1916 [synonym], Lystrosaurus wageri Van Hoepen 1916 [synonym], Lystrosaurus wagneri Van Hoepen 1916 [synonym]
†Lystrosaurus maccaigi Seeley 1898
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Invalid names: Dicynodon (Ptychognathus) latirostris Owen 1860 [synonym], Ptychognathus alfredi Owen 1862 [synonym], Ptychognathus boopis Owen 1876 [synonym]
†Lystrosaurus oviceps Haughton 1915
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Invalid names: Lystrosaurus breyeri Van Hoepen 1915 [synonym], Ptychognathus depressus Owen 1876 [synonym]
†Lystrosaurus declivis Brink 1951
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Invalid names: Ptychognathus declivis Owen 1860 [objective synonym], Ptychosiagum declivis Lydekker 1890 [objective synonym]