Anisogomphus solitaris 

Scope: Global
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Arthropoda Insecta Odonata Gomphidae

Scientific Name: Anisogomphus solitaris Lieftinck, 1971

Assessment Information [top]

Red List Category & Criteria: Critically Endangered (Possibly Extinct) B1ab(iii)+2ab(iii) ver 3.1
Year Published: 2006
Date Assessed: 2006-01-31
Needs updating
Assessor(s): Bedjanič, M.
Reviewer(s): Clausnitzer, V. & Suhling, F. (Odonata Red List Authority)
Anisogomphus solitaris has not been found since its description more than 30 years ago. It is obviously a rare species. Taxonomically isolated, with no near allies. Due to the considerable deviation in adult and larval characters the species most probably may belong to a new genus. Despite the fact that its type locality is already disturbed stream among tea and rubber estates, the species may be already extinct. It is not present in any of the large odonatological collections from the island made by entomologists in last 50 years (NHM Basle (Switzerland), NMNH - Smithsonian Institution (USA), Lund University (Sweden) and University of Vienna (Austria)). Also it was not found during the assessor's surveys in recent years (1995, 2001 and 2003). Since no really exhaustive odonatological faunistic survey, covering appropriate localities in different seasons, has been made by odonatologists in order to eventually find its remaining populations, the species does not yet qualify under category Extinct. More field research is urgently needed.
Date last seen: 1970s

Geographic Range [top]

Range Description:Endemic to Sri Lanka. The species is known only from the type locality (Rambukpath Oya, Hatton, Central Province).
Countries occurrence:
Possibly extinct:
Sri Lanka
Additional data:
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:Current population size is unknown, although it is suspected that the species may already be Extinct.
Current Population Trend:Unknown
Additional data:

Habitat and Ecology [top]

Habitat and Ecology:Habitat is described as stream in deep ravine between tea and rubber estates.
Systems:Terrestrial; Freshwater

Threats [top]

Major Threat(s): The habitat type is under threat. Destruction of primary and secondary rainforests, destruction of forest corridors along streams, pollution and other pressures on streams and rivers in the southwestern and central part of Sri Lanka are the major threats for exceptionally rich endemic dragonfly fauna on the island (Bedjanič 2004).

Conservation Actions [top]

Conservation Actions: Apart from general conservation guidelines, no site specific “single-species-oriented” conservation measures can be proposed for the moment. General guidelines for protection of rich endemic dragonfly fauna of Sri Lanka include: (1) establishment of network of new small protected areas and corridors in the Wet zone; (2) conservation of forest corridors along streams and rivulets outside protected areas in the Wet zone; and (3) effective execution of appropriate nature conservation measures in partly damaged declared protected areas (Bedjanič 2004).

Knowledge on distribution, biology and taxonomy of several endangered endemic dragonfly species from Sri Lanka is very poor or insufficient. In the future special attention should be devoted to the work dealing with taxonomy of larval forms and adults. Serious odonatological faunistic mapping should cover the whole island and should be urgently focused on still preserved and protected areas. Simultaneously also the research of biology and ecology of selected endangered species should be carried out.

As far as species habitat and potential area of occurrence is concerned, the South-western Sri Lanka Rivers and Streams (Ecoregion 172) are included in the prestigious WWF’s global 200 list of the earth’s most biologically outstanding habitats. The conservation status of the ecoregion is judged as vulnerable (Olson et al. 2000).

Citation: Bedjanič, M. 2006. Anisogomphus solitaris. The IUCN Red List of Threatened Species 2006: e.T59696A11972735. . Downloaded on 14 August 2018.
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