Recorded widely across Britain, although records are sparse in Scotland. Observations have declined in recent years (Musgrove, 2023).
A mostly black species with red, if present, restricted to front tibia and apex of femur. Males have a white membranous patch covering the middle of tergites 5 and 6. In the female the sawsheath narrows to a point in dorsal view and has a feeble hook below in lateral view.
Dolerus eversmanni larvae feed on horsetails in wet areas.
Size: 9 - 10mm
GB IUCN Status: Near Threatened
GB Rarity Status: None
Distribution: England, Scotland, Wales, Ireland
Flight period: April to June
Plant associations: Equisetum sp. (horsetails - wet habitat species)
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 Natural England, unpublished