 Voss and Carleton had found some support for a close relationship between "Holochilus", "Lundomys", and "Pseudoryzomys" within Oryzomyini.In subsequent years, the related species "Holochilus primigenus" and "Noronhomys vespuccii" were discovered, providing additional evidence for this grouping.The allocation of the former, which is similar to "Lundomys" in features of the dentition, to "Holochilus" is controversial, and placement as a second species of "Lundomys" has been suggested as an alternative.