''Nesoryzomys narboroughi'' is a

rodent Rodents (from Latin , 'to gnaw') are mammals of the order Rodentia (), which are characterized by a single pair of continuously growing incisors in each of the upper and lower jaws. About 40% of all mammal species are rodents. They are na ...

in the genus ''

Nesoryzomys ''Nesoryzomys'' is a genus of rodent in the tribe Oryzomyini of family Cricetidae, endemic to the Galápagos Islands. Five species have been described, with two of them considered extinct Extinction is the termination of a kind of organism ...

'' from

Fernandina Island Fernandina Island (Spanish: ''Isla Fernandina'', named after King Ferdinand of Spain, the sponsor of Christopher Columbus) (formerly known in English as Narborough Island, after John Narborough) is the third largest, and youngest, island of the ...

in the

Galápagos Islands The Galápagos Islands (Spanish: , , ) are an archipelago of volcanic islands. They are distributed on each side of the equator in the Pacific Ocean, surrounding the centre of the Western Hemisphere, and are part of the Republic of Ecuador ...

Taxonomy

Nesoryzomys indefessus ''Nesoryzomys indefessus'', also known as the Santa Cruz nesoryzomys or Indefatigable Galápagos mouse,Duff and Lawson, 2004 is a rodent of the genus '' Nesoryzomys'' of family Cricetidae from Galápagos Islands of Ecuador. It formerly lived on Sa ...

'', a related

extinct Extinction is the termination of a kind of organism or of a group of kinds (taxon), usually a species. The moment of extinction is generally considered to be the death of the last individual of the species, although the capacity to breed and ...

species, was found on

Indefatigable Island Indefatigable may refer to: Ships * , several ships of the name in the British Royal Navy * , a British training ship * * ''Indefatigable'' (1799 ship), a merchant ship used to transport convicts to Australia * ''Indefatigable'' (aka "The Indie" ...

. Some consider the two to be

subspecies In biological classification, subspecies is a rank below species, used for populations that live in different areas and vary in size, shape, or other physical characteristics (morphology), but that can successfully interbreed. Not all species ...

of one species, in which the Fernandina form would be ''Nesoryzomys indefessus narboroughi''; however, ''N. narboroughi'' is now considered distinct.Dowler, R. C. 2015. Genus Nesoryzomys Heller, 1904. In: Patton, J.L., Pardiñas, U.F.J. and D'Elía, G. (eds), Mammals of South America , pp. 390-393. University of Chicago Press.

Conservation

Due to Fernandina Island's small size, as well as vulnerability to

invasive species An invasive species otherwise known as an alien is an introduced organism that becomes overpopulated and harms its new environment. Although most introduced species are neutral or beneficial with respect to other species, invasive species ad ...

, ''N. narborughi'' was rated by the

IUCN Red List The International Union for Conservation of Nature (IUCN) Red List of Threatened Species, also known as the IUCN Red List or Red Data Book, founded in 1964, is the world's most comprehensive inventory of the global conservation status of biol ...

as a

Vulnerable species A vulnerable species is a species which has been Conservation status, categorized by the International Union for Conservation of Nature as being threatened species, threatened with extinction unless the circumstances that are threatened species, ...

References

Literature cited

*Musser, G.G. and Carleton, M.D. 2005. Superfamily Muroidea. Pp. 894–1531 in Wilson, D.E. and Reeder, D.M. (eds.)
Mammal Species of the World: a taxonomic and geographic reference. 3rd ed
Baltimore: The Johns Hopkins University Press, 2 vols., 2142 pp. Endemic fauna of the Galápagos Islands Nesoryzomys Taxonomy articles created by Polbot {{Sigmodontinae-stub