Species profile: Crunoecia irrorata

February 11, 2016

Crunoecia irrorata (Curtis, 1834)

Crunoecia irrorata is the one of three members of the Family Lepidostomatidae found in Ireland, and the sole representative of the genus in Britain and Ireland. It is a species whose larvae can be found in woodland trickles and streams, being found at the edge of waterbodies and in moist substrata. Crunoecia irrorata has a rather distinctive case, which is initially made of sand grains and has a circular cross-section before generally changing to plant material, resulting in a case with a square cross-section.

In terms of feeding ecology, Crunoecia irrorata has a preference for woody debris, with some shredding of fallen leaves, etc., and predation.

Characteristic features of the larvae of Crunoecia irrorata 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, and posterior metadorsal sclerite with more than one seta, contrasting with single seta of the anterior-median sclerite.

Adults of Crunoecia irrorata can be found on the wing from May to September.

Records of Crunoecia irrorata on the National Biodiversity Data Centre mapping system, can be found here.

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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