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Uma exsul

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Taxonomy [top]

Kingdom Phylum Class Order Family
ANIMALIA CHORDATA REPTILIA SQUAMATA PHRYNOSOMATIDAE

Scientific Name: Uma exsul
Species Authority: Schmidt & Bogert, 1947

Assessment Information [top]

Red List Category & Criteria: Endangered B2ab(iii) ver 3.1
Year Published: 2007
Date Assessed: 2007-03-01
Assessor(s): Vazquez Díaz, J., Gadsden, H., Quintero Díaz, G.E., Ponce-Campos, P. & Lavin, P.
Reviewer(s): Cox, N., Chanson, J.S. & Stuart, S.N. (Global Reptile Assessment Coordinating Team)
Justification:
Listed as Endangered because its area of occupancy is less than 500 km², its distribution is severely fragmented, and the extent of its sand dune habitat is declining and is extremely vulnerable to human activity. The population has been reduced, inferred from a reduction of area of occupancy, by 30 to 35% in the past 10 years. It is an extreme habitat specialist.

Geographic Range [top]

Range Description: This species is restricted to western Coahuila, Mexico. It has a very restricted area of occupancy (AOO); the species occurs in 20 to 30 subpopulations restricted to sand dunes not totaling more than 70 km² in area.
Countries:
Native:
Mexico
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: It is generally a rare species. Under natural conditions, populations are stable. As soon as anthropogenic pressure is introduced, subpopulations are lost.
Population Trend: Decreasing

Habitat and Ecology [top]

Habitat and Ecology: The species is terrestrial and completely restricted to sand dunes in xerophytic scrubland. It seems that the species has low genetic diversity and populations are considered to have a low viability.
Systems: Terrestrial

Threats [top]

Major Threat(s): The species is significantly threatened by habitat degradation resulting from the quarrying of sand, use of recreational vehicles within its sensitive habitat, and conversion of land to agricultural use.

Conservation Actions [top]

Conservation Actions: This species is considered to be threatened by the Goverment of Mexico. It has been recorded from a Biosphere Reserve. Further studies are needed into the distribution, abundance, ecology and threats to this species. Populations should be monitored to record changes in abundance and distribution. Habitat maintenance, conservation and restoration are urgently needed, as is the identification, establishment, and management of protected areas.

Citation: Vazquez Díaz, J., Gadsden, H., Quintero Díaz, G.E., Ponce-Campos, P. & Lavin, P. 2007. Uma exsul. The IUCN Red List of Threatened Species. Version 2014.3. <www.iucnredlist.org>. Downloaded on 27 November 2014.
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