Recorded widely across much of mainland Britain to northern Scotland. Assessments against all criteria give no reason to consider it threatened (Musgrove, 2023).
Ametastegia tenera has an entirely black abdomen and black hind legs. The tegulae are black. The scutellum is more or less punctured in the middle.
Larvae feed on docks and prepupate inside stems and soft wood.
Size: 6 - 8mm
GB IUCN Status: Least Concern
GB Rarity Status: None
Distribution: England, Scotland, Wales, Ireland
Flight period: bi- or multivoltine, April to August
Plant associations: Rumex spp. (docks)
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
Musgrove, A.J. 2023. A review of the status of sawflies of Great Britain - Phase 2: The Athaliidae and the Tenthredinidae (excluding Nematinae). Natural England, unpublished