 The forefeet also lack tufts on the digits and show very long claws, a character unique among oryzomyines.The female has four pairs of teats, and the gall bladder is absent, both important characters of oryzomyines.The head and body length is , averaging , the tail length is 195 to 255 mm (7.68 to 10.04 mm), averaging , and the length of the hindfoot is , averaging .