The abdomen in Apethymus filiformis is generally yellow except for the first tergite but may be infuscated to appear nearly black. The antennae are entirely black in both sexes and the hind tibiae are yellow with only the extreme apex infuscate.
This species overwinters as an egg. Larvae feed on oaks.
Size: 9 - 11mm
Status: Locally common
Distribution: England, Scotland, Wales, Ireland
Flight period: September to November
Plant associations: Quercus spp. (oaks)
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