Urothemis thomasi 

Scope: Global
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Arthropoda Insecta Odonata Libellulidae

Scientific Name: Urothemis thomasi Longfield, 1932
Infra-specific Taxa Assessed:
Regional Assessments:
Common Name(s):
English Desert Basker
Urothemis signata thomasi Longfield, 1932
Urothemis thomasi aethiopica Schneider, 1988
Taxonomic Notes: Synonyms = Urothemis signata thomasi (Longfield, 1932). Also most probably Urothemis thomasi aethiopica Nielsen, 1957 (Schneider, 1988).

Genetic studies are in need for confirmation of the conspecificity of the Omanian (U. thomasi) and Somalian (U. t. aethiopica) populations.

Assessment Information [top]

Red List Category & Criteria: Endangered C2a(i) ver 3.1
Year Published: 2006
Date Assessed: 2006-01-31
Needs updating
Assessor(s): Boudot, J.-P.
Reviewer(s): Clausnitzer, V. & Suhling, F. (Odonata Red List Authority)
This is a poorly known species, which has been reported from eight localities over an extent of occurrence of 164,000 km² in two distinct areas in south and northeast Oman. The area of occupancy in Oman is around 15,000 km². If Urothemis thomasi aethiopica is a synonym of Urothemis t. thomasi, the species range also extends up to Somalia in the African horn (only one old locality known), on an overall area of 226,000 km². As only one old locality has been reported in Somalia, the area of occupancy is virtually unchanged. According to the literature, only eight specimens have been so far collected in Oman and four from Somalia, even by local permanent collectors in Oman, so that the overall population size is suspected to be extremely low (intuitively, probably <2,000 with subpopulations <250). A future degradation of the habitat may be expected in this area due to climatic global changes and to human demography, which increased from a factor four in Oman between 1961 and 2003 and should reach now 3,000,000 of inhabitants (FAO, 2005 in A future decline of the species in Oman is therefore expected. "Urothemis thomasi aethiopica" has apparently not been recorded again since its description in 1957, neither from the type locality nor from another ones, so that this taxa, whatever its correct taxonomic status, is obviously very rare, restricted, localized or extinct. The EN status is recommended for both Urothemis t. thomasi and Urothemis thomasi aethiopica pooled together.
Previously published Red List assessments:

Geographic Range [top]

Range Description:Southeast Arabia in south and northeast Oman. Possibly ranges up to Somalia, if taxonomical changes occur.
Countries occurrence:
Additional data:
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:Population size is most probably very low.
Current Population Trend:Unknown
Additional data:

Habitat and Ecology [top]

Habitat and Ecology:Springs and wadis.
Systems:Terrestrial; Freshwater

Threats [top]

Major Threat(s): Use of water by humans (e.g., drainage, over irrigation, pollution). Drought.

Conservation Actions [top]

Conservation Actions: Perennial management of good quality waters is needed.

Citation: Boudot, J.-P. 2006. Urothemis thomasi. The IUCN Red List of Threatened Species 2006: e.T22817A9389959. . Downloaded on 23 June 2018.
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