Species profile: Tricholeiochiton fagesii

July 22, 2016

Tricholeiochiton fagesii (Guinard, 1879)

Tricholeiochiton fagesii is one of 25 members of the Family Hydroptilidae found in Ireland, and the only member of the genus Tricholeiochiton. It is a species whose larvae can be found in weedy ponds, lakes and bog pools. Tricholeiochiton fagesii has a case made of silk secretions, which is laterally compressed and has anterior and posterior openings of similar size and shape. 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 Tricholeiochiton fagesii is the absence of dorsal and ventral ovoid processes on the abdomen, no lateral protuberances on the 2nd abdominal segment, no median sclerotized point on the labrum, 2nd and 3rd legs 4-5 times as long as 1st leg, and a case as described above.

Adults of Tricholeiochiton fagesii can be found on the wing in July.

For distribution records of Tricholeiochiton fagesii in Ireland available through the National Biodiversity Data Centre mapping system, click here.

Tricholeiochiton fagesii


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

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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