Nymph identification: Capnidae nymphs, although very similar to the Leuctridae in appearance,
can be differentiated by the separation of the tergum and sternum from
abdominal segment 1-9 (Leuctridae only 1-4 divided), which is visible
when nymphs are laid on their dorsal side, with the ventral side facing
up. Nymphs 0.5 to 10 mm in size.
Univoltine - produces one brood in a year. Adult flight period is from February to July. Nymphs present from August to May.
Very rare and restricted. Present only in a few high altitude lakes in counties along the western seaboard.
Records submitted to Data Centre in 2021
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H.B. Feeley, J-R. Baars & M. Kelly-Quinn (2016) The Stonefly (Plecoptera) of Ireland –
Distribution, Life Histories & Ecology. National Biodiversity Data Centre, Waterford. Ireland.