Oedaleops campi (Langston 1965) Asselian, Earliest Permian ~295 mya, ~7 cm skull length, was derived from a sister to Milleretta RC70 and was a sister to Eothyris and Casea. That was a sister to the clade that included Feeserpeton and Australothyris.

Distinct from Milleretta, the skull of Oedaleops had a flatter shape with a larger naris and a taller, less pointed rostrum. The nasal was arrow-shaped. The pineal opening was relatively very large. The prefrontal and postfrontal were closer together. A large lateral temporal fenestra embayed the jugal and squamosal. The supratemporal was larger and overhung the posterior skull.

Caseasauria and the Millerettids, an unnamed clade distinct from the Diadectidae.

Langston W 1965. Oedaleops campi (Reptilia: Pelycosauria), a new genus and species from the Lower Permian of New Mexico, and the family Eothyrididae. Bulletin of the Texas Memorial Museum 9: 1–47. online pdf

Sumida SS, Pelletier V and Berman DS 2014. New information on the basal pelycosaurian-grade synapsid Oedaleops. Vertebrate Paleobiology and Paleoanthropology 2014:7-23.

wiki/Oedaleops
wiki/Caseasauria