 Subsequently, it was rarely mentioned in the literature on South American rodents; those authors who did mention it placed it in either "Oryzomys" or "Calomys".In 1926, American zoologist Colin Campbell Sanborn collected some rodents in Uruguay, which he identified as "Holochilus vulpinus" (currently "Holochilus brasiliensis") in his 1929 report on the collection.When his successor at the Field Museum of Natural History, Philip Hershkovitz, reviewed "Holochilus" in 1955, he recognized that the series from Uruguay contained two species, one close to the forms of "Holochilus" found across much of South America, and another unique to Uruguay and southern Brazil; he named the latter as a new species, "Holochilus magnus".