Cutleria wilmarthi

Cutleria is an extinct genus of basal sphenacodontids[1] or derived stem-sphenacodontoid[2] known from the Early Permian period (Sakmarian stage) of Colorado, United States.

[3] Cutleria is known only from the holotype specimen USNM 22099, a fractured but three-dimensionally preserved, a nearly complete skull and articulated partial postcranial skeleton (including vertebral column, ribs and several girdle and limb elements).

It was collected at locality 3, near Placerville of San Miguel County, Colorado, from the Cutler Formation, dating to the Sakmarian stage of the Cisuralian series.

[1] Benson (in press) listed three synapomorphies between Cutleria and more derived sphenacodontids: their frontal is more than 2.5 times the length of the parietal (as it was noted by Laurin in 1994), a strongly posteroventrally inclined temporal roof (absent in Secodontosaurus), and a lateral centrale that covers the proximal ends of the first-third distal carpals.

Protorothyris archeri Ophiacodontidae Varanopidae Caseasauria Ianthodon schultzei Edaphosauridae Haptodus garnettensis Pantelosaurus saxonicus Therapsida Cutleria wilmarthi Secodontosaurus obtusidens Cryptovenator hirschbergeri Dimetrodon spp.