Males are extremely rare. Abdomen always partly pale below, but mostly black above, and cerci not reaching hack as far as of the narrow sawsheath. The mesopleura and the orbits behind the eyes are mainly black as are the front and middle lobes of the mesonotum.
Larvae feed gregariously on buck's-beard.
Size: Female: 5.0 - 6.0mm.
Status: Locally common
Distribution: England, Scotland, Wales, Ireland
Flight period: Multivoltine, April to September
Plant associations: Aruncus dioicus (buck's-beard)
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
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
Muche, W.H., 1974. Die Nematinengattungen Pristiphora Latreille, Pachynematus Konow und Nematus Panzer (Hym., Temthredinidae). Deutsche Entomologische Zeitschrift, 21(1/3), pp.1-137.
Prous, M., Liston, A., Kramp, K., Savina, H., Vårdal, H. and Taeger, A., 2019. The West Palaearctic genera of Nematinae (Hymenoptera, Tenthredinidae). ZooKeys, 875, p.63-127