MAMMALS FROM THE BLUE ASH LOCAL FAUNA (LATE OLIGOCENE), SOUTH DAKOTA. RODENTIA PART 5: FAMILY CRICETIDAE

摘要: Ten species of cricetid rodents are identified from the Blue Ash fauna including three new species, Eumys brachyodus, E. parvidens, Scottimus sp., cf. S. longiquus, kellamorum, Leidymys L. blacki, juxtaparvulus n. Paciculus dakotensis P. nebraskensis, Geringia copiosus and an indeterminate species. The cricetids best represented one most diverse families anthill fauna. Some genera present in more characteristic Arikareean land mammal age (Leidymys, Paciculus, Geringia), but either smaller or morphologically primitive than those Arikareean. However, (E. longiquus) currently only known Orellan Whitneyan. It appears that fauna, based on rodents, is somewhere near Whitneyan-Arikareean boundary.