Slender and mainly black with yellowish legs and infuscated wings. Antennae are similar to the Argidae but with a tiny additional segment at the tip. Rarely encountered.
Larvae feed inside stems of ferm fronds and their presence is indicated by conspicuous walnut-sized froth balls.
Size: Approx. 8mm
Distribution: England, Wales, Ireland
Flight period: May? to July?
Plant associations: Athyrium filix-femina (lady fern), Dryopteris spp. (buckler and male ferns), Matteuccia struthiopteris (ostrich fern).
The National Biodiversity Network records are shown on the map below. (See terms and conditions)
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