EUURA VIMINALIS GROUP
Euura crassipes - Thickfoot Pea-galler
Nematus crassipes Thomson, 1871
Eupontania crassipes (Thomson, 1871)
Pontania lapponica Malaise, 1920
Pontania enslini Zierngiebl, 1937
This species was lumped with herbaceae and arbusculae in Benson (1958) (as Pontania crassipes) and many older records are no longer referable to any currently recognised species. The only definitive records to date are those noted by Benson as occurring on 19th century herbarium specimens of Salix lapponum from Perthshire and Aberdeenshire (Benson 1954b). A handful of further records from the Highlands are plausible as within the range of the foodplant but do not specify it. Dedicated survey of the species associated with montane willows would be valuable in establishing their status (Musgrove, 2024).
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 crassipes larvae feed on Downy Willow forming a pea gall, in contact with the midrib, above and below the leaf-blade.
Jump to other group viminalis species
Size: Female: 2.7 - 5.4mm, male: 2.8 - 4.8mm
GB IUCN status: Data Deficient
GB rarity status: Nationally Rare
Distribution: Scotland
Flight period: Univoltine
Plant associations: Salix lapponum (Downy 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
Musgrove, A.J. 2024. A review of the status of sawflies of Great Britain - Phase 3: The Tenthredinidae (subfamily Nematinae). Natural England, unpublished