A small black bodies insect with infuscated wings having noticeable subhyaline apices. The tegulae are black and the tibiae and basal tarsal segments are brownish-white. The apical tergites are smooth. Males are unknown.
Profenusa thomsoni larvae mine in the leaves of birch.
Size: 3 - 4mm
Flight period: May to July
Plant associations: Betula spp. (birches)
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