The IUCN Red List of Threatened Species™
ISSN 2307-8235 (online)
IUCN 2008: T10886A3225037
Isthmomys flavidus, Yellow Isthmus Rat
Assessment by: Reid, F., Woodman, N., Timm, R. Samudio, R. & Pino, J.
View on www.iucnredlist.org
Citation: Reid, F., Woodman, N., Timm, R. Samudio, R. & Pino, J. 2008. Isthmomys flavidus. The
IUCN Red List of Threatened Species 2008: e.T10886A3225037.
http://dx.doi.org/10.2305/IUCN.UK.2008.RLTS.T10886A3225037.en
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THE IUCN RED LIST OF THREATENED SPECIES™
Taxonomy
Kingdom
Phylum
Class
Order
Family
Animalia
Chordata
Mammalia
Rodentia
Cricetidae
Taxon Name: Isthmomys flavidus (Bangs, 1902)
Common Name(s):
• English:
Yellow Isthmus Rat
Assessment Information
Red List Category & Criteria:
Near Threatened ver 3.1
Year Published:
2008
Date Assessed:
June 30, 2008
Justification:
Listed as Near Threatened because although its extent of occurrence is less than 20,000 km2, it occurs in
several protected areas and the extent and quality of its habitat may be declining only in parts of its
range. This species is restricted to mature forest and it appears to no longer occur in one previously
known location. This makes it close to qualifying for Vulnerable under the B1 criterion if the decline in
known locations continues and if the distribution becomes severely fragmented or restricted to less
than 6 locations.
Previously Published Red List Assessments
1996 – Lower Risk/least concern (LR/lc)
Geographic Range
Range Description:
This species is known form intermediate elevations in western Panamá (Chiriquí region) and on the
Azuero Peninsula (Musser and Carleton 2005). It is known from 1,000 to 1,500 m (Carleton 1989).
The species is known from two disjunct populations, which are being looked at taxonomically (Timm
pers. comm.).
Country Occurrence:
Native: Panama
© The IUCN Red List of Threatened Species: Isthmomys flavidus – published in 2008.
http://dx.doi.org/10.2305/IUCN.UK.2008.RLTS.T10886A3225037.en
1
Distribution Map
© The IUCN Red List of Threatened Species: Isthmomys flavidus – published in 2008.
http://dx.doi.org/10.2305/IUCN.UK.2008.RLTS.T10886A3225037.en
2
Population
It is apparently rare and local (Reid 1997). It may no longer occur in the Azuero Peninsula, where it has
been looked for recently without success (Reid pers. comm.).
Current Population Trend: Unknown
Habitat and Ecology (see Appendix for additional information)
This species is found in mature forest. Its biology is poorly known; it is nocturnal and terrestrial (Reid
1997).
Systems: Terrestrial
Threats
There are no major threats to this species. In many parts of its range, however, this species may be
subject to threats from deforestation, roads, and agriculture.
Conservation Actions (see Appendix for additional information)
It found within several protected areas including La Amistad National Park. More information is needed
about this species' taxonomy, natural history, populations, and conservation status.
Credits
Assessor(s):
Reid, F., Woodman, N., Timm, R. Samudio, R. & Pino, J.
Reviewer(s):
McKnight, M. (Global Mammal Assessment Team) & Amori, G. (Small Nonvolant
Mammal Red List Authority)
© The IUCN Red List of Threatened Species: Isthmomys flavidus – published in 2008.
http://dx.doi.org/10.2305/IUCN.UK.2008.RLTS.T10886A3225037.en
3
Bibliography
Carleton, M. D. 1989. Systematic and evolution. In: G. L. Kirkland and J. N. Layne (eds), Advances in the
Study of Peromyscus (Rodentia), Texas Tech University Press, Lubbock.
Musser, G. G. and Carleton, M. D. 2005. Superfamily Muroidea. In: D. E. Wilson and D. A. Reeder (eds),
Mammal Species of the World: a geographic and taxonomic reference, pp. 894-1531. The John Hopkins
University Press, Baltimore, USA.
Reid, F. 1997. A field guide to the mammals of Central America and southeast Mexico. Oxford University
Press, New York, USA.
Citation
Reid, F., Woodman, N., Timm, R. Samudio, R. & Pino, J. 2008. Isthmomys flavidus. The IUCN Red List of
Threatened Species 2008: e.T10886A3225037.
http://dx.doi.org/10.2305/IUCN.UK.2008.RLTS.T10886A3225037.en
Disclaimer
To make use of this information, please check the Terms of Use.
External Resources
For Images and External Links to Additional Information, please see the Red List website.
© The IUCN Red List of Threatened Species: Isthmomys flavidus – published in 2008.
http://dx.doi.org/10.2305/IUCN.UK.2008.RLTS.T10886A3225037.en
4
Appendix
Habitats
(http://www.iucnredlist.org/technical-documents/classification-schemes)
Habitat
Season
Suitability
Major
Importance?
1. Forest -> 1.9. Forest - Subtropical/Tropical Moist Montane
-
Suitable
-
Conservation Actions in Place
(http://www.iucnredlist.org/technical-documents/classification-schemes)
Conservation Actions in Place
In-Place Land/Water Protection and Management
Conservation sites identified: Yes, over entire range
Research Needed
(http://www.iucnredlist.org/technical-documents/classification-schemes)
Research Needed
1. Research -> 1.1. Taxonomy
1. Research -> 1.2. Population size, distribution & trends
1. Research -> 1.3. Life history & ecology
1. Research -> 1.6. Actions
3. Monitoring -> 3.1. Population trends
Additional Data Fields
Distribution
Lower elevation limit (m): 1000
Upper elevation limit (m): 1500
Population
Population severely fragmented: No
© The IUCN Red List of Threatened Species: Isthmomys flavidus – published in 2008.
http://dx.doi.org/10.2305/IUCN.UK.2008.RLTS.T10886A3225037.en
5
The IUCN Red List Partnership
The IUCN Red List of Threatened Species™ is produced and managed by the IUCN Global Species
Programme, the IUCN Species Survival Commission (SSC) and The IUCN Red List Partnership. The IUCN
Red List Partners are: BirdLife International; Botanic Gardens Conservation International; Conservation
International; Microsoft; NatureServe; Royal Botanic Gardens, Kew; Sapienza University of Rome; Texas
A&M University; Wildscreen; and Zoological Society of London.
THE IUCN RED LIST OF THREATENED SPECIES™