Tenthredo arcuata Forster, 1771

Tenthredo arcuata

One of a complex of four species: arcuata, brevicornis, notha and schaefferi. Males of the four species cannot always be reliably separated, though Taeger has produced a key to males on the continent. In Tenthredo notha and schaefferi the first tergite has the yellow band broadening laterallty and continuing onto the lateral face. Tenthredo arcuata and brevicornis females can be separated by the shape of the saw teeth. In arcuata the saw teeth are blunt and rounded.

Tenthredo arcuata larvae feed on clovers, especially white clover.

Size: approx. 9 - 11mm

Status: Common

Distribution: England, Scotland, Wales, Ireland

Flight period: Uni- or bivoltine, April to June and sometimes July to August

Plant associations: Trifolium repens (white clover and possibly other clovers/trefoils)

References:

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]