Species profile: Hydroptila lotensis

November 4, 2019

Hydroptila lotensis Mosely, 1930

Hydroptila lotensis is one of 28 members of the Family Hydroptilidae found in Ireland, and one of 13 members of the genus Hydroptila. It is a species whose larvae can be found in rivers, in standing or slow-flowing water, and its substratum preference is for algae. H. lotensis has a case made of sand grains, which is laterally compressed. Only the final instar has a case, and is very different from the earlier instars.

The larvae of most Hydroptilid species are not described. Notable features of the larvae of the genus Hydroptila include a laterally flattened abdomen, which lacks dorsal and ventral ovoid processes, a laterally compressed case made of sand grains (or in one case algal filaments), no sclerotized median point on the labrum, 2nd & 3rd legs at most 1.5 times longer the 1st legs and gill filaments on the anal proleg, the claws of which also have accessory hooks.

Adults of Hydroptila lotensis can be found on the wing from June to August in Britain, and the only known record from Ireland is from June.

There are currently no distribution records available for Hydroptila lotensis in Ireland through the National Biodiversity Data Centre mapping system. The only record for the species is from the River Liffey in Celbridge, Co. Kildare.


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. & O’Connor, M.A. (2019) Hydroptila lotensis Mosely, 1930, new to Ireland and a second Irish record of Hydroptila vectis Curtis, 1834, (Trichoptera: Hydroptilidae). Entomologist’s Monthly Magazine 155: 229–234.

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: 04/11/2019

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