A genus of slim, elongate sawflies. Ametastegia glabrata is the only one in this genus with an all black body, including tegulae, and orange legs, excluding hind tarsi.
Larvae feed on a variety of herbaceous plants and overwinter by burrowing into willow or fruit of apples. Larvae of glabrata are similar to Ametastegia equiseti but do not have a black spot on the dorsum of the anal segment.
Size: 5.5 - 8mm
Distribution: England, Scotland, Wales, Ireland
Flight period: bi- or multivoltine. April to September
Plant associations: Chenopodium spp. (fat hens), Polygonum spp. (redshanks), Rumex (docks) and Rheum (rhubarb), Plantago (plantains), Lythrum salicaria (purple loosestrife) and Salix (willow).
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