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Sphenacomorpha

Taxonomy
Sphenacomorpha was named by Ivakhnenko (2003). It is not extant.

It was assigned to Eotherapsida by Ivakhnenko (2008); to Eupelycosauria by Spindler (2015); to Eupelycosauria by Spindler et al. (2015); and to Synapsida by Spindler et al. (2019).

Subtaxa
Sphenacodontia

Synonymy list
YearName and author
2003Sphenacomorpha Ivakhnenko
2008Sphenacomorpha Ivakhnenko
2015Sphenacomorpha Spindler
2015Sphenacomorpha Spindler et al. p. 18
2019Sphenacomorpha Spindler et al.

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Deuterostomia
phylumChordataHaeckel 1874
subphylumVertebrata
superclassGnathostomata
—Osteichthyes()
subclassSarcopterygii()
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
RankNameAuthor
—Tetrapoda
—Reptiliomorpha
—Anthracosauria
subclassAmphibiosauriaKuhn 1967
—Cotylosauria()
—Amniota
subclassSynapsida
suborderEupelycosauria
—SphenacomorphaIvakhnenko 2003
—SphenacomorphaIvakhnenko 2003

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.

Unr. †Sphenacomorpha Ivakhnenko 2003
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Subor. †Sphenacodontia Romer and Price 1940
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G. †Cutleria Lewis and Vaughn 1965
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†Cutleria wilmarthi Lewis and Vaughn 1965
Fm. †Homodontosauridae Kuhn 1961
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G. †Homodontosaurus Broom 1949
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G. †Ianthodon Kissel and Reisz 2004
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†Ianthodon schultzei Kissel and Reisz 2004
G. †Palaeohatteria Credner 1888
G. †Pantelosaurus v. Huene 1925
G. †Shashajaia Huttenlocker et al. 2021
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†Shashajaia bermani Huttenlocker et al. 2021
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Fm. †Sphenacodontidae Marsh 1878
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G. †Cryptovenator Fröbisch et al. 2011
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†Cryptovenator hirschbergeri Fröbisch et al. 2011
G. †Ctenorhachis Hook and Hotton 1991
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†Ctenorhachis jacksoni Hook and Hotton 1991
Subfm. †Secodontosaurinae Romer and Price 1940
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G. †Secodontosaurus Romer 1936
Subfm. †Sphenacodontinae Romer 1936
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G. †Bathygnathus Leidy 1853
G. †Ctenospondylus Romer 1936
G. †Dimetrodon Cope 1878
G. †Macromerion Fritsch 1879
G. †Neosaurus Nopsca 1923
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Invalid names: Geosaurus Gervais 1869 [replaced]
G. †Sphenacodon Marsh 1878
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Invalid names: Oxyodon von Huene 1908 [replaced]
Invalid names: Dimetrodon kempae Romer 1937 [nomen dubium], Eosyodon Olson 1962 [nomen dubium], Eosyodon hudsoni Olson 1962 [nomen dubium], Palaeohatteriidae Baur 1889 [synonym], Pantelosauridae Huene 1925 [synonym], Varanopsinae Romer 1936 [empty]
Fm. †Tappenosauridae Olson and Beerbower 1953
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G. †Tappenosaurus Olson and Beerbower 1953
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†Tappenosaurus magnus Olson and Beerbower 1953
Invalid names: Anningiidae Broom 1927 [empty], Haptodontinae Romer and Price 1940 [empty]
Diagnosis
No diagnoses are available