Nemurella pictetii


Species Biology


Nymph identification: 0.7 to 11 mm in size. At first glance are similar to other Nemouridae but are identifiable from the well-defined long stout hairs on the dorsal side of each femur (especially the on the hind legs). Long stout hairs (over lapping each abdominal segment) on the dorsal side of the abdomen are also key characteristic of the nymphs of this species.


Restricted to localised areas draining peaty soils usually at higher altitudes and in small headwater streams and seepages. It has also been found at low altitude on the shores lakes. In the UK and Europe nymphs are known to occur in small upland lakes with stony shorelines and in vegetated ponds.

Life cycle

It has a highly variable life cycle, recorded as plurivoltine, univoltine & semivoltine. Nymphs are present all year, and adults are in flight from February to September.


World distribution(GBIF)

Irish distribution

Not common but is found throughout country.  Has been recorded from 77 10km squares in Ireland.

Temporal change

Records submitted to Data Centre in 2020

The following map is interactive. If you would prefer to view it full screen then click here.



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.