Species profile: Wormaldia subnigra

August 9, 2016

Wormaldia subnigra McLachlan, 1865

Wormaldia subnigra is one of five members of the Family Philopotamidae found in Ireland, and one of three Irish representatives of the genus along with Wormaldia mediana and Wormaldia occipitalis. This species can be found in large streams and rivers. The substratum preference ranges from coarse gravel to boulders and bedrock. Wormaldia subnigra has a preference for neutral to alkaline waters (pH ≥ 7) and is a filter-feeder, building long, tubular nets attached to rocks; feeding on organic particulate matter. The species lives for over one year.

The larvae of the Family Philopotomidae can be readily separated from those of other families by the fact that they possess a white membranous labrum, with a brush-like anterior margin, as opposed to a sclerotized labrum. The larvae of Wormaldia spp. are separated from the other genre in the family by the smooth curve of the anterior margin of the frontoclypeus. Separation from Wormaldia mediana, and Wormaldia occipitalis in particular, is difficult and adults are likely to be needed to identify to species.

Adults of Wormaldia subnigra can be found on the wing from July to October.

There are currently no records for Wormaldia subnigra available through the National Biodiversity Data Centre mapping system.

References

Barnard, P. and Ross, E. (2012) The Adult Trichoptera (Caddisflies) of Britain and Ireland. RES Handbook Volume 1, Part 17.

Edington, J.M. (1968) Habitat preferences in net-spinning caddis larvae with special reference to the influence of water velocity. Journal of Animal Ecology 37(3): 675-692.

Edington, J.M. and Hildrew, A.G. (1995) A Revised Key to the Caseless Caddis Larvae of the British Isles: with notes on their ecology. Freshwater Biological Association Special Publication No. 53.

Graf, W., Murphy, J., Dahl, J., Zamora-Muñoz, C. and López-Rodríguez, M.J. (2008) Distribution and Ecological Preferences of European Freshwater Species. Volume 1: Trichoptera. Astrid Schmidt-Kloiber & Daniel Hering (eds). Pensoft, Sofia-Moscow.

O’Connor, J.P. (2015) A Catalogue and Atlas of the Caddisflies (Trichoptera) of Ireland. Occasional Publication of the Irish Biogeographical Society, No. 11.

Last updated 09/08/2016

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