Mammalia - Rodentia - Sciuridae
Parent taxon: Sciuridae according to M. Bryant 1945
Sister taxa: Albanensia, Arctomyoides, Blackiini, Callosciurini, Cedromus, Cynomyoides, Douglassciurus, Forsythia, Funambulini, Heteroxerus, Marmotini, Miosciurus, Miospermophilus, Nototamias, Oligosciurus, Oligospermophilus, Paenemarmota, Palaearctomys, Palaeosciurus, Parapaenemarmota, Paratamias, Petauristodon, Pliopetaurista, Pliopetes, Pliosciuropterus, Prospermophilus, Protosciurus, Protoxerini, Pteromyinae, Ratufini, Sciurillus, Sciurini, Sciurion, Sciurotamias, Similisciurus, Tamiasciurini, Vulcanisciurus, Xerini
Subtaxa: Protospermophilus angusticeps, Protospermophilus kelloggi, Protospermophilus malheurensis, Protospermophilus oregonensis, Protospermophilus quatalensis, Protospermophilus vortmani
Ecology: scansorial granivore-frugivore