Holochilus is a genus of semiaquatic rodents in the tribe Oryzomyini of family Cricetidae, sometimes called marsh rats. It contains three living species, H. brasiliensis, H. chacarius, and H. sciureus, which are widely distributed in South America east of the Andes. A fourth species from the Pleistocene of Bolivia was formerly classified as H. primigenus, but is now placed in the genus Reigomys.

Temporal range: Middle Pleistocene to Recent
Holochilus brasiliensis.jpg
Holochilus brasiliensis
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Rodentia
Family: Cricetidae
Subfamily: Sigmodontinae
Tribe: Oryzomyini
Genus: Holochilus
Brandt, 1835

Holochilus brasiliensis
Holochilus chacarius
Holochilus sciureus


  • Musser, G.G.; Carleton, M.D. (2005). "Superfamily Muroidea". In Wilson, D.E.; Reeder, D.M (eds.). Mammal Species of the World: A Taxonomic and Geographic Reference (3rd ed.). Johns Hopkins University Press. pp. 894–1531. ISBN 978-0-8018-8221-0. OCLC 62265494.