Believed to be extinct in Britain and only known from one record from 1873. Distributed in Central Europe and Scandinavia.
Tarsal claws have an inner tooth. The abdomen is black with some of the middle tergites banded across with red. The hind tibiae are white basally and black apically. Labrum yellow. The anal cells of the fore wing have a cross vein.
Strongylogaster filicis larvae feed on bracken.
Size: 8 - 11mm
Status: Extinct in Britain
Flight period: May to June
Plant associations: Pteridium aquilinum (bracken)
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
Macek, J., 2010. Taxonomy, distribution and biology of selected European Dinax, Strongylogaster and Taxonus species (Hymenoptera: Symphyta). Acta Entomologica Musei Natioalis Pragae, 50(1).