Nesoryzomys indefessus

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Nesoryzomys indefessus
Scientific classification edit
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Rodentia
Family: Cricetidae
Subfamily: Sigmodontinae
Genus: Nesoryzomys
N. indefessus
Binomial name
Nesoryzomys indefessus
(Thomas, 1899)

Nesoryzomys indefessus, also known as the Santa Cruz nesoryzomys[2] or Indefatigable Galápagos mouse,[3] is a rodent of the genus Nesoryzomys of family Cricetidae from Galápagos 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.


  1. ^ The IUCN lists N. i. narboroughi as a different species; thus, this status refers only to the Santa Cruz population.


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

Literature cited[edit]

  • 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. ISBN 978-0-8018-8221-0
  • Tirira, D., Dowler, R., Boada, C. and Weksler, M. 2008. Nesoryzomys indefessus. In IUCN. IUCN Red List of Threatened Species. Version 2009.2. <>. Downloaded on December 8, 2009.