A smaller Tenthredo species similar to Tenthredo amoena. Tenthredo distinguenda has the tegulae entirely yellow and the first antennal segment has a black fleck on the outer side. In amoena the tegulae are only edged with yellow and the first antennal segment is entirely yellow. In the female the fifth tergite is entirely yellow. Both species are mainly associated with chalk downlands.
Larvae are unknown.
Size: 8.5 - 9.5mm
Flight period: May to June
Plant associations: unknown
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]