Euura arcticornis - viminalis group (formerly Pontania arcticornis)
See Liston et al (2017) for determination of adults. The host plant is an upland species.
Euura arcticornis larvae feed on Tea-leaved Willow. The gall is in contact with the midrib, projecting only below the leaf-blade. The gall is often irregularly shaped, glabrous and yellow-green.
Size: Female: 3.0 - 4.9mm, male: 3.5 - 3.8mm
Distribution: England, Scotland, Ireland
Flight period: Univoltine
Plant associations: Salix phylicifolia (Tea-leaved 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.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