Previously considered to be the black form of Eutomostethus ephippius but raised to species level by Blank and Taeger in 1998. Head, thorax and abdomen are all black. Morphologically identical to E. ephippius. A more northern distribution. Males not known.
Eutomostethus nigrans larvae feed on soft grasses such as annual meadow grass.
Size: 4 - 5mm
Distribution: England, Scotland, Wales, Ireland
Flight period: Possibly bivoltine, May to June and August
Plant associations: Gramineae especially Poa spp. (grasses, especially meadow grasses.)
The National Biodiversity Network records are shown on the map below. (See terms and conditions)
Benson, R.B., 1952. Handbooks for the Identification of British Insects. Hymenoptera, Symphyta, Vol 6, Section 2(a-c), Royal Entomological Society, London
Blank, S.M. and Taeger, A., 1998. Comments on the taxonomy of Symphyta (Hymenoptera). Pflanzenwespen Deutschlands (Hymenoptera, Symphyta).–Krefeld, pp.141-174.
Liston A, Knight G, Sheppard D, Broad G, Livermore L (2014) Checklist of British and Irish Hymenoptera - Sawflies, ‘Symphyta’. Biodiversity Data Journal 2: e1168. https://doi.org/10.3897/BDJ.2.e1168
Macek, J. (2014) ‘Descriptions of larvae of the Central European Eutomostethus species (Hymenoptera: Symphyta: Tenthredinidae)’, Acta Entomologica Musei Nationalis Pragae, 54(2), pp. 685–692.