P. fractus P. gnomus P. kummae P. mediaevus P. montanus P. tsosiensis P. wyomingensis Ptilodus (meaning "soft-haired") is a genus of mammals from the extinct order of Multituberculata, and lived during the Paleocene in North America.

Its feet, legs and long tail suggest it was a good climber, so it very possibly led a squirrel-like lifestyle.

Remains have been found in Wyoming, in the United States, in Dell Creek deposits dated to the Tiffanian stage of the Paleocene.

They were recovered from the Cochrane 2 deposits of the Paskapoo Formation, which have been dated to the Tiffanian stage of the Paleocene.

The fourth lower premolar (p4) is about 51% shorter than the corresponding tooth in P. mediaevus; 28% less than P. kummae; 15% less than P. tsosiensis; and 5% smaller than P. fractus, which gives some idea of the relative sizes of the various animals.

Remains have been discovered in Roche Percee, Saskatchewan in Canada, in deposits from the lower Tiffanian stage of the Paleocene.

They have been unearthed from the deposits of the San Juan Basin, which are dated to the Torrejonian stage of the Paleocene.

Remains were recovered in Montana, in the rock of the Silberling Quarry, which is dated to the lower Tiffanian stage of the Paleocene.

Ptilodus tsosiensis has been discovered in New Mexico, the Puercan stage deposits of the Lower Paleocene San Juan Basin.

Remains of Ptilodus wyomingensis have been found in the Middle Paleocene deposits of the Rock Bench Quarry, in Wyoming and North Dakota in the United States.