|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
It was reranked as the superfamily Sphenacodontia by Kuhn (1946); it was reranked as the unranked clade Sphenacodontia by Kissel and Lehman (2002), Kissel and Reisz (2004), Fröbisch et al. (2011) and Spindler et al. (2015).
It was assigned to Pelycosauria by Kuhn (1946); to Pelycosauria by Haughton and Brink (1954); to Pelycosauria by Romer and Price (1940), Olson and Beerbower (1953), Huene (1954), Lewis and Vaughn (1965), Kuhn (1966), Olson (1966), Currie (1977) and Langston and Reisz (1981); to Eupelycosauria by Kissel and Lehman (2002) and Kissel and Reisz (2004); to Synapsida by Fröbisch et al. (2011); and to Sphenacomorpha by Spindler (2015) and Spindler et al. (2015).
|Year||Name and author|
|1940||Sphenacodontia Romer and Price pp. 18, 260|
|1946||Sphenacodontia Kuhn p. 56|
|1953||Sphenacodontia Olson and Beerbower p. 406|
|1954||Sphenacodontia Haughton and Brink p. 5|
|1954||Sphenacodontia Huene p. 28|
|1965||Sphenacodontia Lewis and Vaughn p. C27|
|1966||Sphenacodontia Kuhn p. 120|
|1966||Sphenacodontia Olson p. 302|
|1977||Sphenacodontia Currie p. 929|
|1981||Sphenacodontia Langston and Reisz p. 74|
|2002||Sphenacodontia Kissel and Lehman p. 536|
|2004||Sphenacodontia Kissel and Reisz|
|2011||Sphenacodontia Fröbisch et al.|
|2015||Sphenacodontia Spindler et al. p. 18|
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.