Species profile: Orthotrichia costalis

July 15, 2016

Orthotrichia costalis (Curtis, 1834)

Orthotrichia costalis is one of 25 members of the Family Hydroptilidae found in Ireland, and one of two members of the genus Orthotrichia. It is a species whose larvae can be found in ponds, lakes and slow-flowing rivers. Orthotrichia costalis has a case made of silk secretions, which is not laterally compressed and has two ridges on either side of the mid-dorsal line. Only the final instar has a case, and is very different from the earlier instars.

The larvae of most Hydroptilid species are not described. Defining features of the final instar of the larvae of the genus Orthotrichia is the absence of dorsal and ventral ovoid processes on the abdomen, lateral protuberances on the 2nd abdominal segment, which extend forward, and a median sclerotized point on the labrum.

Adults of Orthotrichia costalis can be found on the wing from May to September.

Records of Orthotrichia costalis on the National Biodiversity Data Centre mapping system can be found here.

Orthotrichia costalis


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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