Euura proxima - proxima group (formerly Pontania proxima )
See Liston et al (2017) for determination of adults. Males are rare. Within this group, males of Euura proxima, bridgmanii and triandrae cannot be separated.
Euura proxima 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)
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