''Amphinectomys savamis'', also known as the Ucayali water rat
[Musser and Carleton, 2005] or amphibious rat,
[Duff and Lawson, 2004] 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
A karyotype is the general appearance of the complete set of metaphase chromosomes in the cells of a species or in an individual organism, mainly including their sizes, numbers, and shapes. Karyotyping is the process by which a karyotype is disce ...
, 2n = 52, falls within the known range of ''Nectomys'' (2n = 38 - 59).
[
]
References
Literature cited
*Duff, A. and Lawson, A. 2004. Mammals of the World: A checklist. New Haven, Connecticut: Yale University Press, 312 pp.
*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. . In IUCN. IUCN Red List of Threatened Species. Version 2009.2.
www.iucnredlist.org
. Downloaded on December 8, 2009.
Mammals of Peru
Oryzomyini
Mammals described in 1994
Aquatic mammals
{{Sigmodontinae-stub