Dolerus (Dolerus) gessneri André, 1880

Dolerus gessneri

A smaller species. Normally all black except for red front and middle knees although more rarely the female abdomen is more or less girdled in red. This species is best determined from examination of the genitalia.
Larvae feed on wet habitat horsetails.

Size: 9 - 10mm

Status: Local

Distribution: England, Scotland, Wales, Ireland

Flight period: May to June

Plant associations: Equisetum sp. (horsetails - wet habitat species)

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