Euura herbaceae - viminalis group (formerly Pontania herbaceae)
See Liston et al (2017) for determination of adults. The host plant is an upland species.
Larvae feed on dwarf willow forming a pea gall, in contact with the midrib, projecting about equally above and below the leaf-blade. The gall is smooth and without hairs. The galls cannot be distinguished from those of Euura aquilonis. The larvae have three annulets on abdominal segments one to eight (four in aquilonis).
Size: Female: 2.8 - 4.4mm, male: 3.2 - 4.6mm
Status: Rare
Distribution: England, Scotland, Wales, Ireland
Flight period: Univoltine
Plant associations: Salix herbacea (dwarf willow)
The National Biodiversity Network records are shown on the map below. (See terms and conditions)
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References:
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