A genus of slim, elongate sawflies. Ametastegia equiseti is the only one in this genus with a red-girdled black body and orange hind femora.
Larvae feed on a variety of herbaceous plants. Larvae of equiseti are similar to Ametastegia glabrata but have a black spot on the dorsum of the anal segment.
Size: 5.5 - 7mm
Distribution: England, Scotland, Wales, Ireland
Flight period: bi- or multivoltine. May to August
Plant associations: Chenopodium album (fat hen), Polygonum persicaria (redshank), Rumex acetosella (sheep's sorrel) and Lythrum salicaria (purple loosestrife).
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