Species profile: Polycentropus irroratus

August 5, 2016

Polycentropus irroratus (Curtis, 1835)

Polycentropus irroratus is one of eleven members of the Family Polycentropodidae found in Ireland, and one of three members of the genus Polycentropus. It is a species whose larvae can be found in streams, rivers and lakes. Its substratum preference includes rocks, boulders, bedrock, plants, mosses and particulate organic matter. This species shows a preference acidic water.

The feeding ecology of Polycentropus irroratus is predominantly predation, with a small amount of passive filter feeding, using nets

Characteristic features of the larva of Polycentropus irroratus include a basal membranous section of the anal proleg equal in length to the distal sclerotized section, anal claws without four blunt teeth on the inside edge, tarsus of the 1st leg less than half the length of the tibia and no pigmented areas on the dorsal surface of the head.

Adults of Polycentropus irroratus can be found on the wing from June to September.

For distribution records of Polycentropus irroratus, visit the National Biodiversity Data Centre page here.

Polycentropus irroratus


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


Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google+ photo

You are commenting using your Google+ account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )


Connecting to %s

%d bloggers like this: