The females are yellow-brown to red-brown with black markings on a spot that encloses the ocellae extending to antennal bases, the bases of the mandibles and large areas of the back of the head. The antennae are black. On the thorax the propleura and mesosternum are mostly black and there are three broad stripes on the mesoscutum with the two outer ones converging towards the scutellum. The mesepimeron, metapleuron and dorsum of the metathorax are partially black on the sutures. The scutellum is yellow-brown with a narrow, dark front edge. The abdomen is extensively darked though this reduces to smaller dorsal black marks on the apical few tergites or even completely pale apically. The sawsheath is darkened apically. The head and thorax are densely and finely sculptured with a silky sheen. The tarsal claws are bifid. The saw is a valid characteristic for identification.
The males are significantly darker than the female with yellow on the clypeus, labrum, base of the mandibles base, malar space and to some degree lightened on the outer orbits.
Larvae feed on aspen.
Size: 5.5 - 7.5mm
Status: Data deficient
Flight period: April to May
Plant associations: Populus tremula (aspen)
The National Biodiversity Network records are shown on the map below. (See terms and conditions)
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
Prous, M., Liston, A., Kramp, K., Savina, H., Vårdal, H. and Taeger, A., 2019. The West Palaearctic genera of Nematinae (Hymenoptera, Tenthredinidae). ZooKeys, 875, p.63-127
Taeger, A. and Blank, S.M., 1998. Beitrag zur Kenntnis einiger Nematinae (Hymenoptera: Tenthredinidae). Pflanzenwespen Deutschlands (Hymenoptera, Symphyta). Kommentierte Bestandsaufnahme. Goecke & Evers, Keltern, pp.247-277