Pediomys

thumb | right | alt=Pediomys upper and lower molars. | Pediomys upper and lower molars. Pediomys is an extinct genus of pediomyid marsupial from the Late Cretaceous of North America.

== Naming == Named in 1889 for a molar from the Lance Formation by Othniel Charles Marsh, the type species P. elegans referred to its small size relative to other mammals from the late Maastrichtian formation. The species Protolambda hatcheri was moved into Pediomys by Simpson in 1927, who also named the subfamily Pediomyinae to separate Pediomys from other members of Didelphidae. Pediomyinae was then expanded by the work of Clemmens in the 1960s, who elevated the subfamily to Pediomyidae and described the new species P. cooki, P. krejcii, and P. florencae, all from the Lance Formation. The new pediomyid species P. exiguus, P. clemensi, P. prokrejcii and the genus Aquiladelphis were then named by Fox and Sahni in the 1970s, with P. clemensi and P. prokrejcii from the Campanian Judith River Formation and suggested to be ancestral to P. cooki and P. krejcii respectively. The species P. fassetti has also been named, from the Fruitland Formation.