Euura aquilonis - viminalis group (formerly Pontania aquilonis )

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.

Euura aquilonis larvae feed on Dwarf Willow causing spherical or bladder-shaped galls attached to the midrib and develop only below the leaf-blade or projecting on both sides. The galls cannot be distinguished from those of Euura herbaceae. The larvae have four annulets on abdominal segments one to eight (three in herbaceae).

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Size: Female: 3.4 - 5.3mm, male: 3.3 - 4.9mm

Status: Rare

Distribution: Scotland

Flight period: Uniivoltine

Plant associations: Salix herbacea (Dwarf Willow)

The National Biodiversity Network records are shown on the map below. (See terms and conditions)

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