 The first two specimens of Eremoryzomys polius were collected by Wilfred Osgood and M.P. Anderson in 1912 . The next year , Osgood described these animals as a new species in the genus Oryzomys , Oryzomys polius . Osgood wrote that he was unable to find any species closely related to O. polius and compared it with O. xanthaeolus ( currently Aegialomys xanthaeolus ) " for convenience " . Its relationships remained obscure ever afterward and it was never assigned to any of the several groups of species recognized within Oryzomys . 
