The species is based on two fragmentary dentaries, each having the incisor, p3, and p4 (Downey 1962). As common with fossil lagomorphs, the p3 is the primary identifier and used to separate this species from other species of Hypolagus on the basis of size and characters of reentrants.
Late Blancan: 111 Ranch (Morgan and White 2005).
Literature. Downey 1962; Morgan and White 2005.
Late Blancan: Jack Rabbit Trail, San Timoteo Badlands (Albright 2000).
Literature. Albright 2000.
Early Irvingtonian: Gypsum Ridge (Wagner and Prothero 2001: cf.).
Literature. Wagner and Prothero 2001.
Last Update: 15 Apr 1014