Lists of synapsids

Incertae cedis synapsids

Genus	Authors	Year	Status	Age	Location	Notes
Delorhynchus	Fox	1962	Valid.	Lower Permian^[1]	United States of America^[1]	Probably a parareptile^[2]
Echinerpeton	Reisz	1972	Valid.
Elcabrosaurus	Case	1907	Syn.
Glaucosaurus	Williston	1915	Valid.	Lower Permian^[3]	United States of America^[3]
Lupeosaurus	Romer	1937	Valid.	Lower Permian^[4]	United States of America^[4]
Nitosaurus	Romer	1937	Valid.	Lower Permian^[4]	United States of America^[4]
Nikkasaurus	Ivakhnenko	2000	Valid.
Reiszia	Ivakhnenko	2000	Valid.
Poecilospondylus	Case	1910	Syn.
Scoliomus	Williston Case	1915	Syn.	Lower Permian^[5]	United States of America^[5]	Junior synonym of Sphenacodon^[5]
Thrausmosaurus	Fox	1962	Valid.	Lower Permian^[2]	United States of America^[2]	The type specie, T. serratidens, was declared to be a nomen dubium^[2]
Trichasaurus	Williston	1913	Valid.	Lower Permian^[6]	United States of America^[6]	Replacement name for Trispondylus Williston, 1910
Wangwosaurus	Young	1979	Valid.
Xyrospondylus	Reisz Heaton Pynn	1982	Valid.

Cotylorhynchus.

Ctenospondylus.

Dinodontosaurus.

Haptodus.

Oedaleops.

Sauroctonus.

Sphenacodon.

^ ^a ^b Cite error: The named reference Langston was invoked but never defined (see the help page).
^ ^a ^b ^c ^d Evans, D. C.; Maddin, H. C. & Reisz, R. R. 2009 A Re-evaluation of Sphenacodontid Synapsid Material from the Lower Permian Fissure Fills near Richards Spur, Oklahoma. Palaeontology 52 (1): 219–227.
^ ^a ^b Modesto, S. P. 1994. The Lower Permian synapsid Glaucosaurus from Texas. Paleontology 37 (1): 51-60.
^ ^a ^b ^c ^d Cite error: The named reference Romer was invoked but never defined (see the help page).
^ ^a ^b ^c Reisz, R. R. & Berman, D. S. 1985. Scoliomus puercensis Williston and Case, 1913, identified as a junior synonym of Sphenacodon ferox Marsh (Reptilia, Pelycosauria)'. Canadian Journal of Earth Sciences 22(8): 1236–1239. Abstract
^ ^a ^b Cite error: The named reference Bruner was invoked but never defined (see the help page).