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February 11, 2019

Trichoptera Ireland is now six years old. The website includes 75 published references related to caddisflies in Ireland gathered in one location (and more to come). I am delighted that the visitor numbers have continued to grow year-on-year. In 2018, the site had 2,989 visitors from 73 countries (up from 2,085 visitors from 73 countries in 2017). The Top 5 countries for 2018 were: United States, United Kingdom, Ireland, Germany and Norway.

There is now a species profile for each of the 153 Irish Trichoptera species available through the website.

Thanks to all my visitors. I hope you have found something useful here.

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Hydropsyche fulvipes (Curtis, 1834)

Hydropsyche fulvipes is one of eight members of the Family Hydropsychidae found in Ireland, and one of six of the genus Hydropsyche. It is a species whose larvae can be found in small, generally first order, streams. 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 fulvipes 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 fulvipes 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 joined aboral and lateral marks and a pale band on the anterior part of the ventral surface of the head (though this is not very dramatic). Its separation from other Hydropsyche larvae is difficult.

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

Hydropsyche fulvipes was added to the Irish list after an adult female was captured in Edenvale, Co. Wexford on 14th August 2018 (O’Connor et al., 2019). Distribution records of Hydropsyche fulvipes in Ireland should soon be available 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., O’Connor, M.A. and Gammell, M.P. (2019) The Caddisfly Hydropsyche fulvipes (Curtis, 1834) (Trichoptera: Hydropsychidae): Finally Confirmed as an Irish Species. Entomologist’s Record and Journal of Variation, 131: 26-31.

Last updated: 09/02/2019

After a number of false starts, Hydropsyche fulvipes (Curtis, 1834) has been added to the Irish Trichoptera list by O’Connor et al., (2019). A female adult was taken on a tributary of the River Sow at Edenvale, County Wexford on 14th August 2018. This brings the list of Trichoptera known from Ireland to 153.

Reference:

O’Connor, J.P., O’Connor, M.A. and Gammell, M.P. (2019) The Caddisfly Hydropsyche fulvipes (Curtis, 1834) (Trichoptera: Hydropsychidae): Finally Confirmed as an Irish Species. Entomologist’s Record and Journal of Variation 131: 26-31.

Last updated: 09/02/2019

New publications for 2018

December 15, 2018

There have been a number of recent publications on the Irish caddisfly fauna, including one confirming the addition of the window winged sedge Hagenella clathrata (Kolenati, 1848) to the Irish list. These are listed here:

Gammell, M.P., Carlin, C.M., O’Connor, J.P., O’Connor, M.A. and Brophy, J.T. (2018) The window winged sedge Hagenella clathrata (Kolenati, 1848) confirmed as an Irish species. Bulletin of the Irish Biogeographical Society 42: 45-57.

O’Connor, J.P. and Bryant, A. (2018) The brackish water caddisfly Ylodes reuteri (McLachlan, 1880) (Trichoptera: Leptoceridae) discovered in County Waterford, Ireland. Bulletin of the Irish Biogeographical Society 42: 3-8.

O’Connor, J.P. and McNaughton, C. (2018) A second Irish record of Limnephilus borealis (Zetterstedt, 1840) (Trichoptera: Limnephilidae) from Northern Ireland. Entomologist’s Monthly Magazine 154: 125-128.

O’Connor, J.P. and O’Connor, M.A. (2018) Records of Irish Caddisflies (Trichoptera) including a county list. Bulletin of the Irish Biogeographical Society 42: 75-154.

O’Connor, J.P., O’Connor, M.A. and McNaughton, C. (2018) Holocentropus dubius (Rambur, 1842) new to Northern Ireland with other caddisfly (Trichoptera) records from the region. Bulletin of the Irish Biogeographical Society 42: 22-33.

16/12/2018

Hagenella clathrata (Kolenati, 1848)

Hagenella clathrata is one of eight members of the Family Phryganeidae found in Ireland, and the only representatives of the genus. It is a species whose larvae can be found in tiny pools on raised bogs and heaths, among tussocks of grasses and sedges. Its substratum preference includes coarse and fine particulate organic matter, and plant material. The species shows a preference acidic water. Its case is made of rectangular sections of dead leaves and is slightly curved.

Hagenella clathrata has a univoltine reproductive cycle (one generation per year) in temperate regions and lives less than one year. Its feeding ecology is partly predatory, partly shredding of fallen leaves and plant material.

Characteristic features of the larva of Hagenella clathrata include the largely unsclerotized mesodorsum and metadorsum, the presence of lateral and dorsal protuberances on the 1st abdominal segment, the absence of conspicuous dark bands on the head and pronotum,  and the apical setae of the tibia and the basal setae of the tarsal claw are slightly curved.

Adults of Hagenella clathrata can be found on the wing in the period June-July in Britain, but, to date, have only been found in June in Ireland.

There are no records of Hagenella clathrata on National Biodiversity Data Centre page at the time of writing, as the species was only added to the Irish list in June 2018, when it was confirmed by a specimen taken in Ower, Co. Galway by Dr Martin Gammell and Dr Catriona Carlin, after being photographed on Abbeyleix Bog, Co. Laois in 2016 by Tina Claffey.

References

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

Gammell, M.P., Carlin, C.M., O’Connor, J.P., O’Connor, M.A. and Brophy, J.T. (2018) The window winged sedge Hagenella clathrata (Kolenati, 1848) confirmed as an Irish species. Bulletin of the Irish Biogeographical Society 42: 45-57.

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.

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: 15/12/2018

Hagenella clathrata at Ower, Co. Galway. Photograph by Caitriona Carlin

Hagenella clathrata at Ower, Co. Galway. Photograph by Caitriona Carlin

The story of the discovery of Hagenella clathrata in Ireland began with a post to the Insects/Invertebrates of Ireland Facebook group on the 26 June 2017 by Tina Claffey looking for a species identification. The image was of an adult caddisfly with black and orange mottled wings photographed on Abbeyleix Bog, Co. Laois on 22 May 2016. At first glance, due to a superficial similarity, the possibility that it was Philopotamus montanus was considered; however, the habitat was all wrong – woodland on a raised bog, rather than a fast-flowing, rocky mountain stream. It was Dr Martin Gammell of GMIT who first suggested Hagenella clathrata as a contender; a species that has never been recorded in Ireland. A brave suggestion based on a photo, I thought. Brave, but as it turned out, correct. Further expertise was brought to bear on the issue to great effect, with Graham Vick confirming that it was indeed the Window winged sedge H. clathrata, a Biodiversity Action Plan (BAP) species in UK and a species that was not previously known from Ireland.

Haganella clathrata_Tina Claffey

The first encounter with Hagenella clathrata in Ireland at Abbeyleix Bog, Co. Laois. Photograph by Tina Claffey – www.TinaClaffey.com

The next step, according to Irish expert Dr Jim O’Connor, was to take at least a single adult specimen for confirmation before the species could be added to the Irish list. Unfortunately, attempts to relocate the species on Abbeyleix Bog in 2017 were unsuccessful and so more visits in 2018 were planned.

As the presumed flight period for H. clathrata approached, the eyes of those with an interest in caddisflies in Ireland turned once again to Abbeyleix Bog, but at this point luck (or fate, for those who hold with such ideas) intervened. While out surveying for the protected butterfly Marsh Fritillary (Euphydryas aurinia) on 1 June 2018 at Ower, Co. Galway, Dr Gammell and Dr Caitriona Carlin spotted some dark-winged caddisflies and took the opportunity to capture one. On getting it under a microscope, it was discovered to be male H. clathrata. From photographs of the genitalia, Dr O’Connor was able to confirm the identification and with an adult in hand, the species can now be added to the Irish list.

Irish entomology continues to throw up new species across many groups, with some being new arrivals, while others might well have been there all along, but avoided detection. No doubt there will be further additions to the Irish Trichoptera list in the future, so keep your eyes open and your net in hand.

References

Gammell, M.P., Carlin, C.M., O’Connor, J.P., O’Connor, M.A. and Brophy, J.T. (2018) The window winged sedge Hagenella clathrata (Kolenati, 1848) confirmed as an Irish species. Bulletin of the Irish Biogeographical Society 42: 45-57.

The mapping system of the National Biodiversity Data Centre (NBDC) received a major overhaul as the Centre moved away from a Microsoft Silverlight-based system to one powered by ArcGIS. One of the many benefits of this change is the introduction of the facility to embed live maps on a third-party websites. These embedded maps update automatically as records are added for a given species. Trichoptera Ireland has taken advantage of this new facility by adding embedded maps to the species profiles for all Irish caddisfly species. These species profiles can be accessed through the Irish Trichoptera Checklist tab.

Below is an example of the NBDC distribution maps showing the distribution of Goera pilosa.

Goera pilosa