Rheomys thomasi 

Scope: Global
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Mammalia Rodentia Cricetidae

Scientific Name: Rheomys thomasi Dickey, 1928
Common Name(s):
English Thomas's Water Mouse

Assessment Information [top]

Red List Category & Criteria: Near Threatened ver 3.1
Year Published: 2008
Date Assessed: 2008-06-30
Assessor(s): Reid, F., Vázquez, E., Emmons, L. & Cuarón, A.D.
Reviewer(s): McKnight, M. (Global Mammal Assessment Team) & Amori, G. (Small Nonvolant Mammal Red List Authority)
Listed as Near Threatened because its extent of occurrence is probably not much greater than 20,000 km2, and the extent and quality of its habitat are probably declining, thus making the species close to qualifying for Vulnerable under criterion B1b(iii).
Previously published Red List assessments:

Geographic Range [top]

Range Description:This species occurs in the highlands of south México (Chiapas), Guatemala, El Salvador and Honduras (Musser and Carleton 2005). It is found from 400 m to 2,700 m (Reid 1997).
Countries occurrence:
El Salvador; Guatemala; Honduras; Mexico
Additional data:
Lower elevation limit (metres):400
Upper elevation limit (metres):2700
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:It is uncommon and local (Reid 1997).
Current Population Trend:Unknown
Additional data:
Population severely fragmented:No

Habitat and Ecology [top]

Habitat and Ecology:This rodent is found along streams through most forest types and second growth (Reid 1997). It is sometimes found on very small streams and steeps in forests, and may be more generalized in diet and habits than other water mice.

In El Salvador, foods eaten include insects, birds, salamanders, mammals (possibly another Rheomys), and starchy pulp (Stirton 1944). One individual from Guatemala had eaten stonefly and mayfly larvae, beetles, and part of a catfish (Hooper 1968). A captive mouse readily consumed small fish and aquatic insect larvae (Reid 1997).
Systems:Terrestrial; Freshwater

Threats [top]

Major Threat(s): Stream degradation and water quality degradation are major threats due to its reliance on stream habitats. Other potential threats include landslides.

Conservation Actions [top]

Conservation Actions: Occurs in El Triunfo National Park in Mexico and in El Imposible National Park in El Salvador. Expected to occur in Sierra de las Minas National Park in Guatemala.

Citation: Reid, F., Vázquez, E., Emmons, L. & Cuarón, A.D. 2008. Rheomys thomasi. The IUCN Red List of Threatened Species 2008: e.T19486A8909070. . Downloaded on 20 June 2018.
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