Oryzomys galapagoensis ssp. galapagoensis

– Extinct

Taxonomy

Kingdom:	ANIMALIA
Phylum:	CHORDATA
Class:	MAMMALIA
Order:	RODENTIA
Family:	MURIDAE
Scientific Name:	Oryzomys galapagoensis ssp. galapagoensis
Infra-specific Authority:	(Waterhouse, 1839)
Taxonomic Notes:	Based on available data, Patton & Hafner (1983) agreed with earlier studies (Heller, 1904; Osgood, 1929; Cabrera, 1961) that suggested O. bauri and O. galapagoensis might be considered conspecific. Musser & Carleton (1993) included O. bauri in O. galapagoensis (Dowler et al. 2000). Giovanni Amori (pers com. 2001) agrees that O. galapagoensis has two subspecies: O. g. galapagoensis and O. g. bauri. Will be transferred to family Cricetidae.

Assessment Information

Red List Category & Criteria:	EX ver 3.1 (2001)
Year Assessed:	2002
Assessor/s:	Gippoliti, S. (Rodent Specialist Group)
Evaluator/s:	Amori, G. & Gippoliti, S. (Rodent Red List Authority)
Justification:	O. g. galapagoensis was first collected on Chatham Island in 1835 by Charles Darwin. It has not been collected since (Dowler et al. 2000).

Geographic Range

Range Description:

Oryzomys galapagoensis was first collected from Chatham Island during Charles Darwin's visit to the Galapagos Islands in 1835. A second, closely related species, O. bauri from Santa Fe was described by Allen in 1892. Later studies (Heller 1904, Osgood 1929, Cabrera 1961, Patton and Hafner 1983) suggested that O. bauri and O. galapagoensis were so similar that they may be considered conspecific (Dowler et al. 2000).

Countries:

Regionally extinct:

Ecuador (Galápagos)

Population

Population:

The Chatham Island population, O. g. galapagoensis has not been collected since 1835, and the taxon is now considered extinct (Dowler et al. 2000).

Habitat and Ecology

System:

Terrestrial

Bibliography

Bibliography:

Allen, J.A. 1892. On a small collection of mammals from the Galápagos Islands, collected by Dr G. Baur. Bulletin of the American Museum of Natural History. 4: 47-50.

Cabrera, C. 1961. Catalogo de los mamiferos de America del Sur. Revista del Museo Argentino de Ciencieas Naturales 'Bernardino Rivadavia'. Ciencias Zoologicas 4: 309-732.

Dowler, R.C., Caroll, D.S. and Edwards, C.W. 2000. Rediscovery of rodents (Genus Nesoryzomys) considered extinct in the Galápagos Islands. Oryx 34:109-117.

Heller, E. 1904. Mammals of the Galápagos archipelago, exclusive of the Cetacea. Proceedings of the California Academy of Sciences 3: 233-251.

Osgood, W. H. 1929. A new rodent from the Galápagos Islands. Field Museum of Natural History, Zoological Series 17: 21-24.

Patton, J. L. and Hafner, M. S. 1983. Biosystematics of the native rodents of the Galápagos archipelago, Ecuador. In: R. I. Bowman, M. Berson, and A. E. Leviton (eds) Patterns of Evolution in Galápagos Organisms, pp. 539-568. AAAS Pacific Division, San Francisco, CA.

Citation:	Gippoliti, S. 2002. Oryzomys galapagoensis ssp. galapagoensis. In: IUCN 2007. 2007 IUCN Red List of Threatened Species. <www.iucnredlist.org>. Downloaded on 06 July 2008.
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