Dolerus gessneri - Gessner's Weeper

Recorded locally but widely mostly in northern and western Britain, with records from Bristol, Coventry and Lincolnshire representing the south-eastern edge of the range at time of writing (Musgrove, 2023).

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.

Jump to other Dolerus species

Size: 9 - 10mm

Status: Least Concern
Status: None

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

Musgrove, A.J. 2023. A review of the status of sawflies of Great Britain - Phase 2: The Athaliidae and the Tenthredinidae (excluding Nematinae). Natural England, unpublished