 The genus is placed in the Oryzomyini tribe, first proposed by Oldfield Thomas in the early 20th century.It includes genera that have certain dental features of the upper and lower molars and a long palate which extends past the third molars.More recently, molecular analysis and morphological data has placed the genus in Clade C, alongside "Neacomys", "Microryzomys" and "Oreoryzomys".