Euura proxima - proxima group (formerly Pontania proxima )
See Liston et al (2017) for determination of adults. Males are rare.
Larvae feed on a range of narrow-leaved willows causing coffee bean shaped galls that transect the leaf blade but grow more on the upper surface . Often many galls per leaf. The galls are green becoming reddish above and usually nobbly or ribbed.
Size: Female: 2.9 - 4.6mm, male: approx. 3.2mm
Distribution: England, Scotland, Wales, Ireland
Flight period: Bi- or multivoltine
Plant associations: Salix alba, Salix fragilis and hybrids (various narrow-leaved willows)
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.D., Heibo, E., Prous, M., Vårdal, H., Nyman, T. and Vikberg, V., 2017. North European gall-inducing Euura sawflies (Hymenoptera, Tenthredinidae, Nematinae). Zootaxa, 4302(1), pp.1-115.
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