A widespread species that is very variable in colour. In the female, the mesopleura are shining without surface sculpture. Typically, the female is pale with much of the head, the mesopleura, tegulae, edge of the pronotum, legs and the apex and underside of the abdomen all being yellow. The sawsheath viewed from above is very narrow.
The male has the mesopleura entirely smooth and the hind femora and the tegulae mostly pale.
Euura viduata larvae feed on grey willow, eared willow, goat willow and creeping willow.
Size: Female: 5.0 - 6.5mm, male: 4.5 - 5.5mm.
Status: Locally common
Distribution: England, Scotland, Wales, Ireland
Flight period: March to May
Plant associations: Salix atrocinerea, Salix aurita, Salix caprea and Salix repens (grey willow, eared willow, goat willow and creeping willow)
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
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