Article · Wikipedia archive · Last revised Jul 27, 2026

Megaoryzomys

Megaoryzomys curioi, also known as the Galápagos giant rat, is an extinct species of sigmodontine rodent, known only from Santa Cruz Island in the Galápagos Islands. It likely met its demise when European settlers introduced invasive species to the island. It is the only species in the genus Megaoryzomys. Its relationships have historically been unclear; it has been placed in both Oryzomyini and Thomasomyini in the past. A 2021 study favoured placing it in the former on overall skull morphology.

Last revised
Jul 27, 2026
Read time
≈ 1 min
Length
222 w
Citations
3
Source
Megaoryzomys curioi
Skull of M. curioi
Scientific classification Edit this classification
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Infraclass: Placentalia
Order: Rodentia
Family: Cricetidae
Subfamily: Sigmodontinae
Genus: Megaoryzomys
Lenglet & Coppois, 1979
Species:
M. curioi
Binomial name
Megaoryzomys curioi
(Niethammer, 1964)

Megaoryzomys curioi, also known as the Galápagos giant rat,2 is an extinct species of sigmodontine rodent, known only from Santa Cruz Island in the Galápagos Islands. It likely met its demise when European settlers introduced invasive species to the island. It is the only species in the genus Megaoryzomys. Its relationships have historically been unclear; it has been placed in both Oryzomyini and Thomasomyini in the past. A 2021 study favoured placing it in the former on overall skull morphology.3

References

References

  1. Weksler, M.; Tirira, D.G. (2019). "Megaoryzomys curioi". IUCN Red List of Threatened Species. 2019 e.T136657A22330270. doi:10.2305/IUCN.UK.2019-1.RLTS.T136657A22330270.en. Retrieved 20 November 2021.
  2. Musser, G. G.; Carleton, M. D. (2005). "Superfamily Muroidea". In Wilson, D. E.; Reeder, D. M. (eds.). Mammal Species of the World: A Taxonomic and Geographic Reference (3rd ed.). Johns Hopkins University Press. pp. 894–1531. ISBN 978-0-8018-8221-0. OCLC 62265494.
  3. Ronez, Christophe; Brito, Jorge; Hutterer, Rainer; Martin, Robert A.; Pardiñas, Ulyses F. J. (2021). "Tribal allocation and biogeographical significance of one of the largest sigmodontine rodent, the extinct Galápagos Megaoryzomys (Cricetidae)". Historical Biology. 33 (9): 1920–1932. Bibcode:2021HBio...33.1920R. doi:10.1080/08912963.2020.1752202. ISSN 0891-2963. S2CID 219054139.