 The two masseteric ridges, to which some of the chewing muscles are attached, are entirely separate, joining only at their anterior edges, which are located below the first molar.The molars are slightly more high-crowned (hypsodont) than in most oryzomyines, and many of the accessory crests are reduced, but they are sharply distinct from the highly derived, hypsodont molars of "Holochilus".The main cusps are located opposite each other and have rounded edges.