Species profile: Oecetis lacustris

January 14, 2017

Oecetis lacustris (Pictet, 1834)

Oecetis lacustris 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 large ponds, lakes, canals and slow-flowing rivers, on a substratum of muddy sand, living plant material and woody debris, occurring in standing water. Oecetis lacustris has a curved, tapering case made of sand grains. The species has no preference in relation to the pH of the water and can be found in brackish water.

In temperate areas, Oecetis lacustris 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 lacustris 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 with 1-4 setae on each side, metaventer with 17-60 setae, protrochantin with several long, dark setae and the 9th abdominal segment with 12 setae on the dorsal surface.

The adults of Oecetis lacustris can be found on the wing in June to October.

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

Oecetis lacustris


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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