Hydropsyche instabilis (Curtis, 1834)

Hydropsyche instabilis is one of nine members of the Family Hydropsychidae found in Ireland, and one of five of the genus Hydropsyche. It is a species whose larvae can be found in the upper reaches of river systems. Its substratum preference ranges from coarse gravel to boulders and bedrock, but includes plant material and woody debris, in areas with moderate to high current velocities. Its preference is for neutral to alkaline waters.

Hydropsyche instabilis lives up to one year and has a univoltine reproductive cycle (one generation per year) in temperate areas. Its feeding ecology is mainly passive filter feeding, with some predation and grazing.

Characteristic features of the larva of Hydropsyche instabilis include the presence of large, rectangular dorsal plates on all three thoracic segments, tufted gills on the abdominal segments up to and including the 7th segment, the lack of long bristles on the front margin of the pronotum, partially pigmented posterior prosternites, a frontoclypeal pattern of separated aboral and lateral marks, a U- or V-shaped aboral mark and a U-shaped frontoclypeus.

Adults of Hydropsyche instabilis can be found on the wing from May to August, though occasionally recorded as early as April.

Records of Hydropsyche instabilis on the National Biodiversity Data Centre mapping system can be found here.

References

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.

O’Connor, J.P. (2015) A Catalogue and Atlas of the Caddisflies (Trichoptera) of Ireland. Occasional Publication of the Irish Biogeographical Society, No. 11.

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.

Last updated: 31/05/2016

Hydropsyche contubernalis McLachlan, 1865

Hydropsyche contubernalis is one of nine members of the Family Hydropsychidae found in Ireland, and one of five of the genus Hydropsyche. It is a species whose larvae can be found in the lower reaches of large rivers. Its substratum preference ranges from coarse gravel to boulders and bedrock, but includes plant material and woody debris, in areas with moderate to high current velocities.

Hydropsyche contubernalis has a univoltine reproductive cycle (one generation per year) in temperate areas. Its feeding ecology is almost entirely passive filter feeding, with some predation and gathering of fine particulate organic matter (FPOM).

Characteristic features of the larva of Hydropsyche contubernalis include the presence of large, rectangular dorsal plates on all three thoracic segments, tufted gills on the abdominal segments up to and including the 7th segment, the lack of long bristles on the front margin of the pronotum, entirely pale posterior prosternites, a submentum that lacks a central knob and a frontoclypeal pattern unobscured by a mat of setae.

Adults of Hydropsyche contubernalis can be found on the wing from May to September.

Records of Hydropsyche contubernalis on the National Biodiversity Data Centre mapping system can be found here.

References

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.

O’Connor, J.P. (2015) A Catalogue and Atlas of the Caddisflies (Trichoptera) of Ireland. Occasional Publication of the Irish Biogeographical Society, No. 11.

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.

Last updated: 31/05/2016

Agrypnia pagetana Curtis, 1835

Agrypnia pagetana is one of seven members of the Family Phryganeidae found in Ireland, and one of three representatives of the genus. It is a species whose larvae can be found in the littoral zone of lakes, ponds and canals, being limited to standing waters. Its substratum preference includes mud, plants, particulate organic matter and woody debris. Final instars of Agrypnia pagetana are known to use a segment of reed or horsetail as a case. The species shows no preference for a particular pH, and can occur in brackish waters.

Agrypnia pagetana has a univoltine reproductive cycle (one generation per year) and lives less than one year. Its feeding ecology is mainly predatory, with some grazing/scraping and gathering of fine particulate organic matter (FPOM).

Characteristic features of the larva of Agrypnia pagetana include the largely unsclerotized mesodorsum and metadorsum, the presence of lateral and dorsal protuberances on the 1st abdominal segment, the strongly banded head with the side bands meeting at the back of the head and running forward as far as the jaws, the presence of a prosternite, a pronotum with two distinct patches of colour and a fronto-clypeal band that is parallel-sided or slightly wider posteriorly.

Adults of Agrypnia pagetana can be found on the wing from April to September.

There are currently no records of Agrypnia pagetana on the National Biodiversity Data Centre mapping system.

References

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 10/07/2017