Euura frenalis - Bridled Willow Nematine

Green in life but a very variable species. In the female the postocellar area, the scutellum, the mesosternum and more or less top of the abdomen are often marked with black. In the male there is a spot on the front and back of the head and the thorax, and the top of the abdomen are marked with black. The clypeus, orbits, rear corners of the pronotum, tegulae, and more or less the coxae and trochanters are whitish. Underside of the abdomen and legs are light brown. The antennae are light brown and darker dorsally.

Euura frenalis larvae feed on willows.

Jump to other species in the oligospila group

Size: Female: 5.0 - 6.5mm, male: 4.5 - 5.0mm.

Status: Rare

Distribution: England, Scotland, Ireland

Flight period: May to June

Plant associations: Salix spp. (willows).


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.

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.