Species profile: Cyrnus flavidus

July 26, 2016

Cyrnus flavidus McLachlan, 1864

Cyrnus flavidus is one of eleven members of the Family Polycentropodidae found in Ireland, and one of three of the genus Cyrnus. It is a species whose larvae can be found in ponds, lakes and slow-moving rivers. Its substratum preference is mainly for plants and mosses, in areas of still water. It shows a preference acidic water, and can be found in brackish water areas.

Cyrnus flavidus lives for up to one year. Its feeding ecology is predominantly predation, with a small amount of passive filter feeding, using tubular nets attached to plants.

Characteristic features of the larva of Cyrnus flavidus include a basal membranous section of the anal proleg equal in length to the distal sclerotized section, the four blunt teeth on the inside of the anal claws, the dorsal surface of the head without a dark band and the light area in the centre of the frontoclypeus including some spots of the posterior row.

Adults of Cyrnus flavidus can be found on the wing from May to September.

For distribution records of Cyrnus flavidus, visit the National Biodiversity Data Centre page here.

Cyrnus flavidus


Barnard, P. and Ross, E. (2012) The Adult Trichoptera (Caddisflies) of Britain and Ireland. RES Handbook Volume 1, Part 17.

Edington, J.M. and Hildrew, A.G. (1995) A Revised Key to the Caseless Caddis Larvae of the British Isles: with notes on their ecology. Freshwater Biological Association Special Publication No. 53.

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.

Last updated: 08/04/2018


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