Euura leionota - Smoothback Birch Nematine

This species is mainly yellow with reddish on the top of the head, the thorax and the abdomen. The following are marked with black: a spot on the base of the antennae, the two basal antennal segments and more or less the dorsal face of the antennae, an ocellar spot, the posterior corners of the pronotum, the longitudinal grooves on the mesoscutum and the sunken parts of the metanotum, the rear edge of the scutellum and the postscutellum, more or less the propleurae and the sternal and pleural parts of the thorax. The abdomen is also black on the first tergite and more or less the basal 4 to 6 tergites in the middle. Males are undescribed.

Euura leionota larvae feed on birches.

Size: Female: 7.0mm, male: 4.5 - 5.0mm.

Status: Rare

Distribution: England, Scotland, Ireland

Flight period: April to May

Plant associations: Betula spp. (birches).


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.

Muche, W.H., 1974. Die Nematinengattungen Pristiphora Latreille, Pachynematus Konow und Nematus Panzer (Hym., Temthredinidae). Deutsche Entomologische Zeitschrift, 21(1/3), pp.1-137.

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