Group proxima

Description follows Liston et al, 2017. This group form bean-shaped galls on willow leaf blades on secondary and tertiary veins. In Britain, the hostplants are widespread and common. Species in this group are all bivoltine or multivoltine in good years. The characteristics of the group are as follows. The mandibles are asymmetric with the right one being evenly tapered and the left narrowing rapidly from the base to a narrow blade-like apex. The cross vein 2r-m is usually present on the forewing submarginal cells. The supraclypeal region is shiny and glabrous, or has up to 5 setae. The antennae are moderately long.  The cerci are short being only about 3 times as long as their maximum width and clearly shorter than the sawsheath. The penis valve of the males has small spines ventrally. 

This group are unusual amongst the sawflies of the Western Palaearctic region in that they reproduce by parthenogenesis that produces only females (thelytokous). 

Group proxima

Euura bridgmanii (Cameron, 1883) = Pontania bridgmanii (Cameron, 1883)

Euura proxima (Serville, 1823) = Pontania proxima (Serville, 1823)

Euura triandrae (Benson, 1941) = Pontania triandrae Benson, 1941

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, 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

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.