 The coat, which is long, dense, and soft, is yellow–brown at the sides, but becomes darker on the upperparts and lighter on the underparts.The large hindfeet are characterized by conspicuous interdigital webbing, but they lack tufts of hair on the digits and several of the pads are reduced.As in some other semiaquatic oryzomyines, fringes of hair are present along the plantar margins and between some of the digits.