A large black and green species similar to Tenthredo mesomela and mioceras. In obsoleta the mesopleura are black with a narrow subvertical green stripe whereas in the other two species the mesopleura are largely green with a wide black stripe. The stigma and costa of the fore wing and most of the upper surfaces are black.
A moorland species. Larvae feed on ribwort plantain.
Size: 9.5 - 12.5mm
Distribution: England, Scotland, Ireland
Flight period: June to July
Plant associations: Plantago lanceolata (ribwort plantain)
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
Fekete, K. (2018) Beginner’s guide to identifying British Tenthredo, Natural History Museum, London. http://www.nhm.ac.uk/content/dam/nhmwww/take-part/identification-trainers/sawflies-guide-id-trainees.pdf [Accessed 26Apr2019]