Oligotricha striata (Linnaeus, 1758)

Oligotricha striata is one of six members of the Family Phryganeidae found in Ireland, and the only representative of the genus. It is a species whose larvae can be found in the still waters of pools and ditches, particularly those with acid peaty water and Sphagnum mosses. The species shows a preference for acid waters and can occur in brackish waters.

Oligotricha striata has a univoltine reproductive cycle (one generation per year) in temperate regions and lives less than one year. Its feeding ecology is mainly predatory, with some shredding of fallen leaves and plant material, and gathering of fine particulate organic matter (FPOM).

Characteristic features of the larva of Oligotricha striata include the largely unsclerotized mesodorsum and metadorsum, the presence of lateral and dorsal protuberances on the 1st abdominal segment, almost parallel parietal bands running anterior to posterior on the head and continuous with lines on the abdominal segments.

Adults of Oligotricha striata can be found on the wing from July to August.

There are currently no records of Oligotricha striata on the National Biodiversity Data Centre website. The species has not been recorded in Ireland since 1969.

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 31/05/2016

Agrypnia varia (Fabricius, 1793)

Agrypnia varia is one of six 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 still waters including lakes and ponds. Its substratum preference includes mud, plants, particulate organic matter and woody debris. The species shows no preference for a particular pH, and can occur in brackish waters.

Agrypnia varia has a univoltine reproductive cycle (one generation per year) in temperate regions 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 varia 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 a continuous black band traversing the anterior margin, and the narrow band of coxal combs on the ventral surface of the 1st and 2nd legs, which are attached transversely, longitudinally and at intermediate angles.

Adults of Agrypnia varia can be found on the wing from (May-June) July to October.

Records of Agrypnia varia on the National Biodiversity Data Centre website 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.

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 31/05/2016

Hydropsyche siltalai Doehler, 1963

Hydropsyche siltalai 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 streams and 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. It shows no preference for pH.

Hydropsyche siltalai lives for 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 siltalai include the presence of large, rectangular dorsal plates on all three thoracic segments, the lack of long bristles on the front margin of the pronotum and tufted gills on the abdominal segments with the exception of the 7th segment.

Adults of Hydropsyche siltalai can be found on the wing from June to September.

Records of Hydropsyche siltalai on the National Biodiversity Data Centre website 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