|Scientific Name:||Heliogomphus walli Fraser, 1925|
|Red List Category & Criteria:||Near Threatened ver 3.1|
|Reviewer(s):||Kalkman, V. & Clausnitzer, V. (Odonata Red List Authority)|
The species is apparently the most common endemic representative of the genus Heliogomphus in Sri Lanka. But still, it is known only from twelve localities in different districts of Sri Lanka's 'wet zone' (the mountains and the southwestern part of the country), whereby the records mostly originate from last few years. Although the habitat type of the species is under threat, there is a wealth of fast flowing rivulets with waterfalls in Sri Lanka. Only focused field work and research can show the true distribution of Heliogomphus walli and determine its population trends. The species is assessed as Near Threatened as it has nearly meets for Vulnerable having less than 20 known locations and is suspected to have on ongoing decline of its habitat.
|Range Description:||The species is found in Sri Lanka and known and recently recorded from more than 10 localities; Badulla, Matara, Ratnapura, Galle and Matale District.|
|Range Map:||Click here to open the map viewer and explore range.|
|Population:||Population size and trend is unknown, presumably not so rare and populations not so small as the current data show.|
|Current Population Trend:||Unknown|
|Habitat and Ecology:||It inhabits fast flowing streams with waterfalls and surrounding forest, occasionally found also in streams between tea plantations. Larval form undescribed.|
|Major Threat(s):||Fast flowing streams with waterfalls and surrounding forest are the type of habitat under treat. However, fast flowing rivulets and streams with waterfalls are common in the 'wet zone' (mountains and the southwestern part of the country) of Sri Lanka. 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 threat for exceptionally rich endemic dragonfly fauna of the island.|
Apart from the 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' (mountains and the southwestern part of the country), (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 (Bedjanic 2004).
Bedjanič, M. 2004. Odonata fauna of Sri Lanka: research state and threat status. Guardians of the watershed - Global status of dragonflies: critical species, threat and conservation 7(2): 279-294.
Fraser, F.C. 1925. Indian dragonflies. Part XXI. Journal Bombay Natural History Society 30: 849-851.
Fraser, F.C. 1933d. The Gomphinae of Ceylon (Order Odonata). Ceylon Journal of Science - Section B: Zoology 18(1): 20-26.
Fraser, F.C. 1934. The Fauna of British India, including Ceylon and Burma. Odonata. Vol. II. Taylor & Francis, London.
IUCN. 2009. IUCN Red List of Threatened Species (ver. 2009.2). Available at: www.iucnredlist.org. (Accessed: 3 November 2009).
Olson, D.M., Dinerstein, E., Abell, R., Allnutt, T., Carpenter, C., Mcclenachan, L., D’amico, J., Hurley, P., Kassem, K., Strand, H., Taye, M. and Thieme, M. 2000. The Global 200: a representation approach to conserving the earth’s distinctive ecoregions. World Wildlife Fund-US, Washington.
|Citation:||Bedjanič, M. 2009. Heliogomphus walli. The IUCN Red List of Threatened Species 2009: e.T163520A5610917.Downloaded on 14 December 2017.|
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