The genus was named by paleontologist Edward Drinker. Nellieae is mentioned in a manuscript than a publication. Sinclairi seems to have become Parectypodus sinclairi. Remains have been found in Wyoming in the United States, have been discovered in Wyoming in the United States, were recovered in Montana in the rock. The species was named by J, was named by C, was named by David W and was named by E. Gnomus Ptilodus gnomus are the smallest, known member of the genus. Tsosiensis Ptilodus tsosiensis has been discovered in New Mexico.
Genus of mammals, Smallest, known member of the genus, Large species