Rodents (Mammalia) from the Whitneyan (Middle Oligocene) Cedar Pass Fauna of South Dakota

摘要: ABSTRACT Twenty species of rodents are recognized from the early Whitneyan Cedar Pass Fauna South Dakota. Two new recognized, sciurid Douglassciurus bjorki (including specimens originally referred to Cedromus wilsoni Korth and Emry, 1991, late Blue Ash Fauna) cricetid Paciculus cedrus. Due a more complete record at Pass, florentiamyid Hitonkala martintau Korth, 2008, is allocated genus Kirkomys Wahlert, 1984 as combination, (Korth, 2008). The sample this also allows for description cranium previously only known single partial skull. Among genera identified two earlier occurring have their last occurrence six later first occurrence. Thirteen that extend into Arikareean present in lacking Fauna. Only one rodent limited...