Coloured green in life. Specimens need to be determined by examination of the saw or penis valve. The female is similar to Euura bergmanni and the oligospila group. They may be marked with black on the upper surface of the antennae, a small ocellar mark and a small spot behind the postocellar area, on the mesonotum, adjacent to the scutellum, the scutellar appendage, small dot-shaped spots in front of the scutellum and the abdomen which is mostly blackened only in the middle of the basal tergite. The male is like the female, but with black on a large frontal postocellar stain, the occipital area, most of the mesonotum, the scutellum and a broad streak on the dorsum of the abdomen.
Euura sylvestris larvae are undescribed but associated with willows and occasionally aspen.
Size: Female: 5.0 - 6.5mm, male: 5.0 - 6.0mm.
Distribution: England, Scotland
Flight period: Assumed May to June, July to August
Plant associations: Salix spp. and Populus tremula (willows and aspen)
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
Prous, M., Liston, A., Mutanen, M. 2021. Revision of the West Palaearctic Euura bergmanni and oligospila groups (Hymenoptera, Tenthredinidae. Journal of Hymenoptera Research. http://zoobank.org/1459B177-AF2B-4D39-9483-E8BA21E70E67