The head is black with orange-red on the mouthparts, between the antennae and a larger spot on the upper corner of the eye. In the male the whole lower part of the head and more or less the orbits and the base of the antennae are sometimes more or less yellow. The thorax is orange-red with black on the mesonotum, mesosternum, middle of the metanotum. The abdomen is completely orange-red with at most the middle of the first tergite black. The legs are yellow with slightly darkened tarsi.
Euura bipartita larvae feed on the underside of rolled leaves of creeping willow and common osier.
Size: Female: 5.0 - 6.5mm, male: 5.0 - 6.5mm.
Status: Locally common
Distribution: England, Scotland, Wales
Flight period: May to June and July to August
Plant associations: Salix repens and Salix viminalis (creeping willow and common osier).
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