Dolerus pachycerus
An entirely black species with no visible microsculpture on the first three tergites and the other tergites with transverse alutaceous surface sculpture. The front lobe and the lateral lobes of the mesonotum and the scutellum all with a large shining puncture free or with a few feeble punctures. Identification is best determined by examination of the genitalia aided by its association with estuarine and salt marsh habitat. 9-9.5mm.
Status: Local
Distribution: England, Scotland, Wales
Flight period: May to June
Plant associations: unknown but associated with salt marshes.
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