Euura arbusculae - viminalis group (formerly Pontania arbusculae)

See Liston et al (2017) for determination of adults. The host plant is an upland species. Within this group, males of Euura aquilonis, crassipes, collectanea, myrsiniticola, pedunculi, saliciscinereae, samolad, viminalis, herbaceae and arbusculae are inseparable.

Larvae feed on Mountain Willow causing pea-shaped galls. However, a further, as yet unidentified species, within the viminalis group may cause galls on this willow and galls cannot be attributes solely to Euura arbusculae.

Jump to other group viminalis species

Size: Female: 3.4 - 3.7mm, male: 3.9 - 4.9mm

Status: Rare

Distribution: Scotland

Flight period: Univoltine

Plant associations: Salix arbuscula (Mountain Willow)

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