The single species, P. concinna, is found in the Kimberley area of northeastern Western Australia and in Arnhem Land in the northern Northern Territory. The fur is short, soft, and silky. The upper back is rusty red to grayish, the rump is reddish to orange, the underparts are white or grayish white, and the tail becomes darker toward the tip. The hind foot is well padded, and the sole is roughly granulated.
Females have four mammae in the pouch.
Peradorcas resembles Petrogale burbidgei but is distinguished by its longer ears and dental characters. Its molar dentition is unique among marsupials in that there are supplementary replacement molars behind the last regular molar. The actual number of molar teeth is not known, but study suggests that as many as nine molars may erupt successively and that seldom are there more than five molars in place at any one time. These ferns are extremely abrasive, and this factor may be associated with the development of the continual molar replacement system found in Peradorcas. In the wet season, activity is partly diurnal and the diet includes grasses that grow on the margins of the plains that are not inundated.