Calameuta filiformis - Dark-legged Stem-sawfly
One of two Calameuta species found in Britain and Ireland. Calameuta filiformis is the larger species. It is associated with wet habitats such as fens, marshes and wet woodland. Widespread from Yorkshire southwards, with a few records also north to Fife. (Musgrove, 2022). The hind tibia is entirely black, whereas Calameuta pallipes has mainly yellow tibia.
Larvae feed inside the smaller stems of moisture-loving reeds and grasses.
Size: 9 - 12mm.
GB IUCN Status: Least concern
GB Rarity Status: None
Distribution: England, Scotland, Wales
Flight period: May to July
Plant associations: Fens and marshes. Calamagrostis epigejos (Wood Small-reed), Phragmites australis (Common Reed), and various grasses including Elytrigia repens (Common Couch Grass), Arrhenatherum elatius (False Oat-grass), Phalaris arundinacea (Reed Canary Grass).
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
Musgrove, A.J. 2022. A review of the status of sawflies of Great Britain - Phase 1: families other than Tenthredinidae. Natural England, unpublished