Nesoryzomys indefessus

Taxonomy

Assessment Information

Geographic Range

Population

Habitat and Ecology

Threats

Conservation Actions

Taxonomy [top]

Kingdom	Phylum	Class	Order	Family
ANIMALIA	CHORDATA	MAMMALIA	RODENTIA	CRICETIDAE

Scientific Name:

Nesoryzomys indefessus

Species Authority:

(Thomas, 1899)

Common Name/s:

English

–

Indefatigable Galapagos Mouse

Taxonomic Notes:

This species previously has been considered a synonymous with N. narboroughi (see Musser and Carleton 1993). Recent evidence suggests that the two should be treated as separate species (Dowler et al. 2000). More research is needed to confirm that these are really two different species (M. Weksler pers. comm.).

Assessment Information [top]

Red List Category & Criteria:

Extinct ver 3.1

Year Assessed:

2008

Assessor/s

Tirira, D., Dowler, R., Boada, C. & Weksler, M.

Evaluator/s:

Amori, G. (Small Nonvolant Mammal Red List Authority) & Schipper, J. (Global Mammal Assessment Team)

Justification:
This species is listed as Extinct as specimens were last collected in 1934 and repeated surveys at several places on the island have failed to locate any individuals. The extinction is probably due to the introduction of the Black Rat Rattus rattus to the island in the late 1930s and was either the result of the introduction of pathogens to which the native species was susceptible or through direct competition with the introduced species. Other species introduced include House Mouse Mus musculus, the Norway Rat R. norvegicus and feral cats, all of which would also have had an impact on rodent decline and extinction.

History:

2000	–	Extinct
1996	–	Endangered

Geographic Range [top]

Range Description:	This species is endemic to Galápagos Islands. It was found on Santa Cruz (= Indefatigable), and Baltra (= South Seymour) Islands (Dowler et al., 2000).
Countries:	Regionally extinct: Ecuador (Galápagos)
Range Map:	(click map to view full version)

Population [top]

Population:	The last documented record was in 1934 (Patton and Hafner, 1983). This species is extinct (Dowler et al., 2000).

Population:

The last documented record was in 1934 (Patton and Hafner, 1983). This species is extinct (Dowler et al., 2000).

Habitat and Ecology [top]

Habitat and Ecology:	There is little information on the habitat and ecology of this species.
Systems:	Terrestrial

Threats [top]

Major Threat(s):	The introduction of the black rat (Rattus rattus) is the cause of the probable extinction of this species.

Major Threat(s):

The introduction of the black rat (Rattus rattus) is the cause of the probable extinction of this species.

Conservation Actions [top]

Conservation Actions:	There are not conservation measures.

Conservation Actions:

There are not conservation measures.

Citation:	Tirira, D., Dowler, R., Boada, C. & Weksler, M. 2008. Nesoryzomys indefessus. In: IUCN 2009. IUCN Red List of Threatened Species. Version 2009.2. <www.iucnredlist.org>. Downloaded on 21 November 2009.
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