In 2006, the taxon previously known as C. tenuicornis was split into three species, also including alchemillae and uncta. Recent records of this group suggest that alchemillae is the more widespread species in the south of Britain at least, although a number of records of tenuicornis have been confirmed from Yorkshire (and nowhere else yet). Historic records assigned to tenuicornis must be treated with contempt.
In this species the mesopleura are continuously pubescent. The tegulae and the pronotal angles are black.
The larvae are associated with meadowsweet.
Size: Approx. 4 - 6mm
GB IUCN Status: Data Deficient
GB Rarity Status: Unclear
Flight period: April to August
Plant associations: Filipendula ulmaria (meadowsweet)
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
Liston, A.D., Taeger, A. and Blank, S.M., 2006. Comments on European Sawflies (Hymenoptera: Symphyta). Recent Sawfly Research: Synthesis and Prospects. Goecke & Evers, Keltern, pp.246.
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 Natural England, unpublished