Nesoryzomys indefessus, also known as the Santa Cruz Nesoryzomys or Indefatigable Galapagos Mouse, is a rodent of the genus Nesoryzomys of family Cricetidae from Galapagos Islands of Ecuador. It contains two subspecies: one (N. i. indefessus) formerly lived on Santa Cruz Island, but is now extinct, probably due to the introduction of black rats; and another (N. i. narboroughi) that is still alive on Fernandina Island. The two are sometimes considered to be different species.
Its specific name is Latin for "unwearied, indefatigable", but the species was named after its island, which was formerly known as "Indefatigable Island" after a ship with the same name.
Musser, G.G. and Carleton, M.D. 2005. Superfamily Muroidea. Pp. 8941531 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. ISBN 978-0-8018-8221-0
Tirira, D., Dowler, R., Boada, C. and Weksler, M. 2008. . In IUCN. IUCN Red List of Threatened Species. Version 2009.2. < www.iucnredlist.org>. Downloaded on December 8, 2009.
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