The tarsal claws have a large inner tooth and a pronounced basal lobe so that they appear almost tridentate. They are black with the edge of the pronotum, tegulae and legs yellow, though the hind tibiae and tarsi have black apices.
Stauronematus platycerus larvae feed on poplars and occasionally willows. Larvae surround themselves with palisades of white dried saliva.
Size: 5 - 6.5mm
Distribution: England, Scotland, Wales
Flight period: May to June and July to September
Plant associations: Populus spp., and sometimes on Salix spp. (poplars and willows)
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., Liston, A., Kramp, K., Savina, H., Vårdal, H. and Taeger, A., 2019. The West Palaearctic genera of Nematinae (Hymenoptera, Tenthredinidae). ZooKeys, 875, p.63.