RODENTS (MAMMALIA) FROM THE WHITNEYAN (MIDDLE OLIGOCENE) CEDAR PASS FAUNA OF SOUTH DAKOTA

摘要

Twenty species of rodents are recognized from the early Whitneyan Cedar Pass Fauna of South Dakota. Two new species are recognized, the sciurid Douglassciurus bjorki (including specimens originally referred to Cedromus wilsoni Korth and Emry, 1991, from the late Whitneyan Blue Ash Fauna) and the cricetid Paciculus cedrus. Due to a more complete record at Cedar Pass, the florentiamyid Hitonkala martintau Korth, 2008, is allocated to the genus Kirkomys Wahlert, 1984 as a new combination, Kirkomys martintau (Korth, 2008). The new sample of this species also allows for a description of the complete cranium of Kirkomys previously only known from a single partial skull.