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Thalassothemis marchali 

Scope: Global
Language: English
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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Arthropoda Insecta Odonata Libellulidae

Scientific Name: Thalassothemis marchali (Rambur, 1842)

Assessment Information [top]

Red List Category & Criteria: Endangered B1ab(i,ii,iii)+2ab(i,ii,iii) ver 3.1
Year Published: 2017
Date Assessed: 2016-07-11
Assessor(s): Martens, A. & Schütte, K.
Reviewer(s): Dijkstra, K.-D.B. & Solofoniaina, A
Facilitator/Compiler(s): Maiz-Tome, L.
Justification:
Thalassothemis Ris, 1909 is a monotypic Mascarenan genus. T. marchali is restricted to rocky mountain forest streams and rivers. There are no records from cultivated areas. The species is known from the type locality, which was described in 1842, from a male caught in 1954 (Pinhey 1955) and from recent observations made by Andreas Martens. So far, there are two locations with four localities known, three of which are situated in the SE mountains (A. Martens, unpubl).

Mauritius has experienced a loss of 95% of its natural vegetation and less than 100 km² of Mauritius’ native vegetation is left (Safford 2001). Safford (2001, p. 584)  “even in reserves the native vegetation is progressively degrading, and this therefore presents a chronic problem for native wildlife”. In respect of these statements and its habitat requirements of Thalssothemis marchali — mountain forest streams and rivers — a drastic past, present and future decline is inferred for this species. With the current known four populations the area of occupancy is below 10 km² and the extent of occurrence below 100 km². Therefore the species is assessed as Endangered.
Previously published Red List assessments:

Geographic Range [top]

Range Description:This species is considered endemic to Mauritius.
Countries occurrence:
Native:
Mauritius
Additional data:
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:The population size is unknown. Inferred to be declining.
Current Population Trend:Decreasing
Additional data:

Habitat and Ecology [top]

Habitat and Ecology:The species is found in rocky mountain forest rivers and streams.
Systems:Terrestrial; Freshwater

Threats [top]

Major Threat(s): The main threat to this species is habitat loss caused by deforestation for tea and sugar plantations.

Conservation Actions [top]

Conservation Actions: No conservation actions are known for this species. Forest conservation is recommended.

Citation: Martens, A. & Schütte, K. 2017. Thalassothemis marchali. The IUCN Red List of Threatened Species 2017: e.T60276A88078700. . Downloaded on 26 September 2017.
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