EUURA PILISERRA GROUP
Euura piliserra - Bristled Leaf-galler
Nematus piliserra Thomson, 1863
Nematus (Phyllocolpa) piliserra Thomson, 1863
Phyllocolpa piliserra (Thomson, 1863)
Pontania piliserra (Thomson, 1863)
Pontania (Phyllocolpa) piliserra (Thomson, 1863)
Pontania piliserris Thomson, 1863
Pontania xanthogaster Cameron, 1877
Pontania bipartitus Cameron, 1885
Pontania piliserra var. mascula Enslin, 1915
Pontania piliserra var. tristis Enslin, 1915
Hypolaepus (Pteronidea) weiffenbachi (Lindqvist, 1958)
Nematus weiffenbachi (Lindqvist, 1958)
Pteronidea weiffenbachi Lindqvist, 1958
North to southern Scotland. Benson (1958) described this as occurring 'throughout Britain' but actual records have been very sparse. Another Osier-feeding species that is apparently very poorly recorded (Musgrove, 2024).
See Liston et al (2017) for determination.
Euura piliserra larvae feed on Common Osier and Holme Willow. Larvae in this group cause the outer leaf margins to curl down and in towards the mid vein creating two tubes with multiple larvae in each. They feed on the lower surface and then leave the tubes and eat the whole leaf-blade leaving the midrib intact.
Size: Female: 4.7 - 5.8mm, male: 4.9 - 5.6mm
GB IUCN status: Data Deficient
GB rarity status: Nationally Rare
Distribution: England, Scotland, Ireland
Flight period: Bivoltine, May to June, July to August
Plant associations: Salix viminalis and Salix dasyclados (Common Osier and Holme 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 Natural England, unpublished