Strongylogaster filicis (Klug, 1817)

Strongylogaster filicis

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

Distribution: England

Flight period: May to June

Plant associations: Pteridium aquilinum (bracken)

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

Macek, J., 2010. Taxonomy, distribution and biology of selected European Dinax, Strongylogaster and Taxonus species (Hymenoptera: Symphyta). Acta Entomologica Musei Natioalis Pragae, 50(1).