A small black bodies insect with uniformly infuscated wings. The tegulae, tibiae and basal tarsal segments are yellowish-white. The tergites have a fine microreticulated, or alutaceous, surface sculpture visible at high magnification. Males are unknown.
Profenusa pygmaea larvae mine in the upper cell layers of oak leaves.
Size: 3 - 4mm
Distribution: England, Scotland, Wales, Ireland
Flight period: May to July
Plant associations: Quercus robur and Quercus petraea (pedunculate and sessile oaks)
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