The head is black and glossy. The second antennal segment is about as long as wide and certainly not significantly wider than long. The thorax is also black and glossy and the mesopleura are sparsely hairy. The abdomen is also black throughout. The legs are variable being black in the darkest specimens with only the apices of the femora and tibiae off-yellow.
Claremontia alternipes larvae feed on brambles, especially raspberries.
Size: 5.5 - 6.5mm
Flight period: April to May
Plant associations: Rubus spp. including Rubus idaeus (brambles including raspberry)
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
Sheppard, D. A., 2019. British Symphyta (draft in preparation)