Rhyacophila munda McLachlan, 1862

Rhyacophila munda is one of two members of the Family Rhyacophilidae found in Ireland (the other being Rhyacophila dorsalis). This species can be found in upland stony, streams and rivers, with a substratum preference ranging from coarse gravel to boulders and in high current velocities. Rhyacophila munda has no preference with regard to the pH of the water. It is a free-living species and so does not build a case like many other caddisfly larvae, feeding by active predation. In temperate latitudes, Rhyacophila munda exhibits a univoltine reproductive pattern.

The larvae of Rhyacophila munda can be readily identified, and separated from R. dorsalis, based on a number of features. Both species lack hard, sclerotized plates on the 2nd & 3rd thoracic segments. Both species have tufted gills laterally on the abdominal segments, while R. munda has single filament gills on the thoracic segments compared to the tufted thoracic gills of R. dorsalis.

The larva is green in life, while preservation in 70% Industrial Methylated Spirits (IMS) renders it a pale pink-white colour.

Adults of Rhyacophila munda can be found on the wing from (May) July to November.

Records of Rhyacophila munda 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.

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: 31/05/2016

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Rhyacophila dorsalis (Curtis 1834)

Rhyacophila dorsalis is one of two members of the Family Rhyacophilidae found in Ireland (the other being Rhyacophila munda). This species can be found in stony, flowing waters of small streams to large rivers, with a substratum preference ranging from coarse gravel to boulders, and in high current velocities. Rhyacophila dorsalis has a preference for acid waters (pH < 7). It is a free-living species and so does not build a case like many other caddisfly larvae, feeding by active predation. In temperate latitudes, Rhyacophila dorsalis exhibits a univoltine reproductive pattern.

The larvae of Rhyacophila dorsalis can be readily identified, and separated from R. munda, based on a number of features. Both species lack hard, sclerotized plates on the 2nd & 3rd thoracic segments. Both species have tufted gills laterally on the abdominal segments, while R. dorsalis also has tufted gills on the thoracic segments compared to R. munda’s single filament thoracic gills. (The identification of R. dorsalis in Britain is complicated by the presence of Rhyacophila obliterata and Rhyacophila fasciata; species which have not been recorded in Ireland).

The larva is green in life, while preservation in 70% Industrial Methylated Spirits (IMS) renders it a pale pink-white colour.

Adults of Rhyacophila dorsalis can be found on the wing from April to October.

Records of Rhyacophila dorsalis 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.

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: 31/05/2016

Additional records have been added to the Trichoptera (caddisflies) of Ireland dataset on the National Biodiversity Data Centre (http://maps.biodiversityireland.ie/#/DataSet/165) bringing the total number of records from published sources to 96. The new records range from 1952 to 2000 and include some records for Northern Ireland. These records are based on eight publications. The following list includes the author(s) and year of publication, while the full reference can be found by clicking on the References tab above:

Barnard, P.C. and O’Connor, J.P. (1987)

Baynes, E.S.A. (1953)

Fahy, E. (1973)

Kelly, D.W., Dick, J.T.A., Montgomery, W.I. and MacNeil, C. (2003)

O’Connor, J.P. and Bond, K.G.M. (1995)

O’Connor, J.P. and O’Connor, M.A. (1980)

O’Connor, J.P. and O’Connor, M.A. (1982)

O’Connor, J.P., Good, J.A. and Bond, K.G.M. (1990)