Waterhouse's swamp rat

Waterhouse's swamp rat (Scapteromys tumidus) is a semiaquatic rodent species from South America.^[2] It is found in southern Brazil, Uruguay and northern Argentina, where it lives in freshwater and salt marshes, as well as open grassland of the pampas.^[1] Its karyotype has 2n = 24, substantially lower than its closest relative S. aquaticus with 2n = 32.^[3]

Waterhouse's swamp rat
Conservation status
Least Concern  (IUCN 3.1)[1]
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Order:	Rodentia
Family:	Cricetidae
Subfamily:	Sigmodontinae
Genus:	Scapteromys
Species:	S. tumidus
Binomial name
Scapteromys tumidus (Waterhouse, 1837)