Species profile: Oxyethira sagittifera

July 19, 2016

Oxyethira sagittifera Ris, 1897

Oxyethira sagittifera is one of 25 members of the Family Hydroptilidae found in Ireland, and one of six members of the genus Oxyethira. It is a species whose larvae can be found in lakes and large ponds. Oxyethira sagittifera 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.

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.

Adults of Oxyethira sagittifera can be found on the wing from April to September.

There are currently no distribution records available for Oxyethira sagittifera 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.

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: 19/07/2016

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