Recorded locally in England mostly to the south-east of Birmingham with a single outlier near Liverpool in 1993 (Musgrove, 2023).
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 feed on Perforate St -John's-wort.
Size: 8.5 - 9.5mm
GB IUCN Status: Least Concern
GB Rarity Status: None
Flight period: May to June
Plant associations: Hypericum perforatum (Perforate St John’s-wort)
Benson, R.B., 1952. Handbooks for the Identification of British Insects. Hymenoptera, Symphyta, Vol 6, Section 2(a-c), Royal Entomological Society, London
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]
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 Natural England, unpublished
Taeger, A. 1991: Vierter Beitrag zur Systematik der Blattwespengattung Tenthredo Linnaeus. Die Untergattung Zonuledo Zhelochovtsev, 1988 (Hymenoptera, Tenthredinidae). - Entomofauna. Zeitschrift für Entomologie, Ansfelden 12(23): 373-398