Species profile: Lepidostoma basale

February 11, 2016

Lepidostoma basale (Kolenati, 1848)

Lepidostoma basale is the one of three members of the Family Lepidostomatidae found in Ireland, and one of two representatives of the genus in Britain and Ireland. It is a species whose larvae can be found in a range of flowing waters including stony rivers and large streams. Lepidostoma basale’s case is curved and made of sand grains. It has a preference for a substratum of woody debris, but can also be found in particular organic matter (POM), and sediment ranging from coarse gravel to boulders and bedrock in slow-flowing and still waters.

In terms of feeding ecology, Lepidostoma basale has a preference for grazing algal tissues, biofilm, etc., woody debris, and shredding fallen leaves.

Characteristic features of the larvae of Lepidostoma basale include the presence of a prosternal horn visible on the ventral side of the pronotum (can be difficult to see without manipulating the legs), the lack of a dorsal protuberance on the 1st abdominal segment, antennae very close to the front margin of the eye, posterior metadorsal sclerite and anterior-media sclerite with a single seta each, and several setae on the anterior edge of the mesonotum in addition to the anterior-lateral setal group.

Adults of Lepidostoma basale can be found on the wing from May to June.

Records of Lepidostoma basale on the National Biodiversity Data Centre mapping system can be found here (presented under the former name Lasiocephala basalis).

References

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

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.

Wallace, I.D., Wallace, B. and Philipson, G.N. (2003) Keys to the Case-bearing Caddis Larvae of Britain and Ireland. Scientific Publication of the Freshwater Biological Association No. 61.

Last updated 31/05/2016

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