A black insect. The third antennal segment clearly shorter than the fourth and fifth combined. Clypeus subtruncate. Hind tibia with white basally (basal one-third in female and basal one-quarter in male). Hind tarsus entirely black on basal segment.
Larvae are mucus covered " slugworms" that feed on the underside of oak leaves. They pupate in the ground.
Size: 4 - 6mm
Flight period: June to August
Plant associations: Quercus spp. (oaks.)
The National Biodiversity Network records are shown on the map below. (See terms and conditions)
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