Species profile: Oecetis testacea

January 14, 2017

Oecetis testacea (Curtis, 1834)

Oecetis testacea is one of 24 members of the Family Leptoceridae found in Ireland, and one of five member of the genus Oecetis. It is a species whose larvae can be found in lake-shores, rivers and canals, on a substratum of rock and woody debris, with no real preference for current speed. Oecetis testacea has a case with a flattened ventral surface, made of plant fragments, especially roots. The species has a preference for acidic water.

In temperate areas, Oecetis testacea has a univoltine (one generation per year) reproductive cycle, and lives for up to one year. In terms of feeding ecology, the larvae are predators.

Defining features of the larvae of Oecetis testacea include antennae at least six times longer than wide, a mesonotum without dark, curved posterior-lateral projections, mandibles at least three times as long as wide, with a single cutting edge, labrum with numerous setae on the dorsal surface, mesoventer without setae, metaventer with 1-6 setae, posterior margin of head with three pale muscle attachment spots on each side of the coronal suture, 3rd leg with two long setal fringes, and 8th abdominal segment with short setae on each side.

The adults of Oecetis testacea can be found on the wing in May to September.

For details of records of Oecetis testacea, visit the National Biodiversity Data Centre page here.

Oecetis testacea


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: 09/04/2018



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