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Taxonomic status of Edaphosaurus raymondi Case

The Edaphosauridae is an important family of primitive synapsids that includes the oldest known terrestrial herbivorous vertebrates. Until the recent description of a new, primitive edaphosaur from the Upper Pennsylvanian of Kansas (Reisz and Berman, 1986), the herbivorous Edaphosaurus was the only known member of the family. Accordingly, fragmentary edaphosaurid materials from Europe and North America had been assigned to Edaphosaurus on the basis of the characteristic neural spine morphology.