 The incisors are large and ungrooved. Their enamel is orange, but paler on the lowers. The orientation of the upper incisors is opisthodont, with the cutting edge oriented backwards. The molars are brachydont (low-crowned) and have two rows of main cusps separated by deep valleys and complemented by a network of crests and smaller cusps. The first upper molar is broader than in T. talamancae. As in this species, but unlike in many other rice rats, including H. alfaroi, the mesoflexus on the second upper molar, which separates the paracone (one of the main cusps) from the mesoloph (an accessory crest), is not divided in two by an enamel bridge. The hypoflexid on the second lower molar, the main valley between the cusps, is very long, extending more than halfway across the tooth; in this trait, it is similar to T. talamancae but unlike H. alfaroi. Each of the upper molars has three roots (two on the outer and one on the inner side) and each of the lowers has two (one at the front and another at the back).
