2009 in paleomammalogy

Choctawius[3] Valid Early Wasatchian United States A member of Primatomorpha belonging to the family Microsyopidae.

Darwinius[8] Valid early Geiseltalian Messel Formation Germany Diaceratherium massiliae[9] Disputed Late Oligocene France A rhinoceros.

Originally described as a species of Diaceratherium; Tissier, Antoine & Becker (2021) interpreted it as a junior synonym of Ronzotherium romani.

[10] Diacocherus dockeryi[3] Valid Early Wasatchian United States A member of Erinaceomorpha belonging to the group Litocherinae.

Disallomys[11] Valid Late Oligocene United States An aplodontiid rodent, a new genus for the species "Allomys" storeri Tedrow and Korth.

Eritherium[14] Valid Early Thanetian Ouled Abdoun basin Morocco The oldest, smallest and most primitive elephant relative.

actites[3] Valid Early Wasatchian United States A rodent related to members of the genus Paramys.

Mustela nivalis kudarensis[25] Valid Middle to late Pleistocene South Ossetia A fossil subspecies of the least weasel.

Notiolofos[29] Valid Eocene La Meseta Formation Antarctica(Seymour Island) A member of Litopterna belonging to the family Sparnotheriodontidae; a replacement name for Notolophus Bond et al.

Sallamys quispea[39] Valid Deseadan Moquegua Formation Salla Beds[40] Bolivia[40] Peru A caviomorph rodent related to the group Octodontoidea.

Wyonycteris primitivus[3] Valid Early Wasatchian United States A member of Soricomorpha belonging to the family Nyctitheriidae.