Group micronematica
Description follows Prous et al, 2017. Additional research is needed to delimit the species more reliably in this group and the species are not keyed beyond group level in Prous et al (2017). Only Pristiphora sermola is thought to be present in Britain.
Despite the problems in delimiting species there are some characteristics common to the group. The sawsheath has small latero-posterior projections, is squarish when viewed from above and has two dense bundles of setae at its apex. The lancets have setae. Penis valves have a pseudoceps with have a membranous region covered with hairs.
The larvae feed on Salix spp. (willows).
Group micronematica
Pristiphora sermola Liston, 1993
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
Prous, M., Kramp, K., Vikberg, V. and Liston, A., 2017. north-Western Palaearctic species of Pristiphora (hymenoptera, tenthredinidae). Journal of Hymenoptera Research, Vol. 59