Group viminalis
Description follows Liston et al, 2017. This group form bladder or pear-shaped galls on willow leaf blades on the mid-vein. Galls formed on lateral veins do not reach maturity. In Britain, the hostplants are, for the most-part, upland species. Only pedunculi, vesicator and viminalis utilise more widespread hostplants. Species in this group are univoltine, except for vesicator and viminalis which are bivoltine. The characteristics of the group are as follows. The mandibles are symmetric with each tapering gradually from the base to the apex. The cross vein 2r-m is usually present on the forewing submarginal cells. The supraclypeal region is densely setose. The antennae vary by species from short to long long. The cerci are moderate being about 3.5 to 6 times as long as their maximum width and reaching at least half way along the sawsheath. The penis valve of the males has small spines ventrally.
Group viminalis
Subgroup aquilonis
Euura aquilonis (Benson, 1941) = Pontania aquilonis Benson, 1941
Subgroup aquilonis
Euura arbusculae (Benson, 1941) = Pontania arbusculae Benson, 1941
Euura crassipes (Thomson, 1871) = Pontania crassipes (Thomson, 1871)
Euura herbaceae (Cameron, 1876) = Pontania herbaceae (Cameron, 1876)
Subgroup viminalis
Euura arcticornis (Konow, 1904) = Pontania arcticornis Konow, 1904
Euura collactanea (Förster, 1854) = Pontania collactanea (Förster, 1854)
Euura myrsiniticola (Kopelke, 1991) = Pontania myrsiniticola Kopelke, 1991
Euura pedunculi (Hartig, 1837) = Pontania pedunculi (Hartig, 1837)
Euura saliciscinereae (Retzius, 1783) = Pontania saliciscinereae (Retzius, 1783)
Euura samolad (Malaise, 1921) = Pontania samolad Malaise, 1920
Euura viminalis (Linnaeus, 1758 = Pontania viminalis (Linnaeus, 1758)
Subgroup vesicator
Euura pustulator (Forsius, 1923) = Pontania pustulator Forsius, 1923
Euura vesicator (Bremi-Wolf, 1849) = Pontania vesicator (Bremi-Wolf, 1849)
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.