Pristiphora conjugata - Species not placed in a group
This species has a bicoloured stigma though this is not pronounced in the male. It is possible that two species reside within conjugata. However, variation in the morphology is continuous across specimens from poplar and those of willow. That said, males reared from willow have a predominantly black propleuron, whereas males reared from poplar have an extensively pale propleuron. Males are best determined by examination of the penis valves.
Pristiphora conjugata larvae feed socially on black poplar, aspen, white willow, goat willow, grey willow, crack willow and bay willow.
Size: 5.5 - 6.5mm
Flight period: April to June and July to August
Plant associations: Populus nigra, Populus tremula, Salix alba, Salix caprea, Salix cinerea, Salix fragilis and Salix pentandra (black poplar, aspen, white willow, goat willow, grey willow, crack willow and bay willow)
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, 59