 Eastern and western population are not morphologically or phylogenetically distinguishable, although noted for ecological differences that suggests definable groups of the species.The tolerance of the western and southern populations to alterations in fire regimes and frequency may also indicate divergence within the species.A larger species of the "Pseudomys", a genus of Australian rodents, with a body mass in a range from 55 to 90 grams for an average weight of 70 grams.