United States: Scarritt Quarry (Early Palaeocene), Douglass Quarry (Middle Palaeocene)

See also Ptilodus, Ptilodus gnomus, Ptilodus kummae, Ptilodus montanus, Ptilodus sp., Ptilodus sp. 2, Ptilodus sp. C, Ptilodus tsosiensis, Ptilodus wyomingensis