A smaller yellow and black species. The antennal flagellae are entirely black but with yellow scapes. The underside of the abdomen is mostly black. The yellow bands on the tergites do not broaden at the sides. The tegulae are entirely black. The apex of the hind tibia is black in the male and reddish in the female. Associated with marsh edges and chalk downs.
Tenthredo thompsoni larvae feed on marjoram, mints, plantains and gypsywort.
Size: 9 - 11mm
Status: Locally common
Distribution: England, Wales
Flight period: July to September
Plant associations: Origanum vulgare (marjoram), Mentha (mint), Plantago (plantain) and Lycopus (gypsywort)
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]