Species profile: Ithytrichia clavata

July 11, 2016

Ithytrichia clavata Morton, 1905

Ithytrichia clavata is one of 25 members of the Family Hydroptilidae found in Ireland, and one of two members of the genus Ithytrichia. It is a species whose larvae can be found in fast-flowing rivers. Ithytrichia clavata has a case made of secretions, and is laterally compressed. Only the final instar has a case, and is very different from the earlier instars.

The larvae of most Hydroptilid species are not described. The defining feature of the final instar of the larvae of the genus Ithytrichia is the presence of dorsal and ventral ovoid processes on the laterally compressed abdomen.

Adults of Ithytrichia clavata can be found on the wing from July to August.

Records of Ithytrichia clavata on the National Biodiversity Data Centre mapping system can be found here.

Ithytrichia clavata


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: 15/03/2018


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