Oxyethira mirabilis Morton, 1904

Oxyethira mirabilis is one of 28 members of the Family Hydroptilidae found in Ireland, and one of seven members of the genus Oxyethira. It is a species whose larvae can be found in streams and rivers. Oxyethira mirabilis has a case made of silk secretions, which is laterally compressed and has a narrow anterior opening and broad posterior opening. Only the final instar has a case, and is very different from the earlier instars. This species can be found in brackish waters.

The larvae of most Hydroptilid species are not described. Defining features of the final instar of the larvae of the genus Oxyethira is the absence of dorsal and ventral ovoid processes on the abdomen, no lateral protuberances on the 2nd abdominal segment, no median sclerotized point on the labrum, 2nd and 3rd legs 2-3 times as long as 1st leg, and a case as above.

The flight period for adults of Oxyethira mirabilis in Britain has been given as July, while adults were taken on the wing in Ireland in June and August.

There are currently no distribution records available for Oxyethira mirabilis in Ireland through 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. (2019) Oxyethira mirabilis Morton (Trichoptera: Hydroptilidae), a caddisfly new to Ireland. British Journal of Entomology and Natural History 32: 231-234.

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: 01/11/2019

Hydroptila vectis Curtis, 1834

Hydroptila vectis 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 streams on a substratum of algae. Hydroptila vectis 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 vectis can be found on the wing from June to September.

There are currently no distribution records available for Hydroptila vectis in Ireland through 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. (2019) Hydroptila vectis Curtis, 1834, new to Ireland and the first Irish adult of Tricholeiochiton fagesii (Guinard, 1879) (Trichoptera: Hydroptilidae). Entomologist’s Monthly Magazine 155: 163–167.

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: 01/11/2019

Two new species, Hydroptila vectis Curtis, 1834 and Oxyethira mirabilis Morton, 1904, have been added to the Irish Trichoptera list by O’Connor (2019a; 2019b). Males of Hydroptila vectis were discovered in preserved malaise trap samples taken in 1998 in Glenveagh National Park, Co. Donegal by Dr Martin Speight, and deposited with the National Museum of Ireland. Females of Oxyethira mirabilis were similarly discovered in preserved malaise trap samples taken in 1997 in Ballycroy National Park, Co. Mayo by Dr Martin Speight. This brings the number of Trichoptera known from Ireland to 155. The first adult of Tricholeiochiton fagesii was also discovered in the samples from 1997 taken in Ballycroy National Park, with the species only known previously in Ireland from larval material.

References

O’Connor, J.P. (2019a) Hydroptila vectis Curtis, 1834, new to Ireland and the first Irish adult of Tricholeiochiton fagesii (Guinard, 1879) (Trichoptera: Hydroptilidae). Entomologist’s Monthly Magazine 155: 163–167.

O’Connor, J.P. (2019b) Oxyethira mirabilis Morton (Trichoptera: Hydroptilidae), a caddisfly new to Ireland. British Journal of Entomology and Natural History 32: 231-234.

Last updated: 28/08/2019