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Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Rodentia
Family: Cricetidae
Subfamily: Sigmodontinae
Tribe: Oryzomyini
Genus: Amphinectomys
Malygin, 1994
Species: A. savamis
Binomial name
Amphinectomys savamis
Malygin, 1994

Amphinectomys savamis, also known as the Ucayali water rat[2] or amphibious rat,[3] is a rodent from the Peruvian Amazon. It is placed as the only member of genus Amphinectomys in the tribe Oryzomyini of family Cricetidae. It is similar to Nectomys, but its discoverers considered it to be different enough (with more expansive interdigital webbing and a significantly broader interorbital region) to require its own genus. When it was described as a new genus in 1994, knowledge of the variation within Nectomys was much more limited than it is now, and it has been suggested that the status of the taxon be re-examined considering this new information. The species's karyotype, 2n = 52, falls within the known range of Nectomys (2n = 38 - 59).[2]


  1. ^ Pacheco et al., 2008
  2. ^ a b Musser and Carleton, 2005
  3. ^ Duff and Lawson, 2004

Literature cited[edit]

  • Duff, A. and Lawson, A. 2004. Mammals of the World: A checklist. New Haven, Connecticut: Yale University Press, 312 pp. ISBN 0-7136-6021-X
  • Malygin, V.M., Aniskin, V.M., Isaev, S.I. and Milishnikov, A.N. 1994. Amphinectomys savamis Malygin Gen. et sp. n., a new species and a new genus of water rat (Cricetidae, Rodentia) from Peruvian Amazonia. Zoologicheskii Zhurnal 73:195-208.
  • Pacheco, V., Zeballos, H. and Vivar, E. 2008. Amphinectomys. In IUCN. IUCN Red List of Threatened Species. Version 2009.2. <>. Downloaded on December 8, 2009.