Capnia atra


Species Biology


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.


Small upland lakes (>300 m) and shores of large lakes (e.g. Lough Corrib, Lough Conn, Lough Mask) at low altitude (15 m).

Life stages

Univoltine - produces one brood in a year. Adult flight period is from February to July. Nymphs present from August to May.


World distribution(GBIF)

Irish distribution

Very rare and restricted. Present only in a few high altitude lakes in counties along the western seaboard.

Temporal change

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.