Euura dispar (Zaddach, 1876)

Euura dispar

Euura pseudodispar, previously thought to be an arctic or sub-arctic species, is now considered to be synonymous with the more widespread Euura dispar. Euura dispar is similar in appearance to Euura viridis and glutinosae and can only be distinguished by the saw and penis valve characteristics (see Prous, et al, 2021).

Females are extensively green in life but the ground colour is sometimes yellow. The head and thorax are variable from mostly yellow or green to mostly black and the abdomen may be entirely green or extensively marked with black on the dorsum.

Males have a pale pronotum. The stigma is also more or less uniformly pale. The pale ground colour may be green or yellow.

Euura dispar larvae feed on birches in birch woodlands.

Size: 4.5 to 9mm

Status: Widespread

Distribution: England, Scotland

Flight period: Assumed May to June, July to September

Plant associations: Betula spp. (birches)

References:

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

Lindqvist E., 1969. – Neue Nematinen aus Finnland. II. (Hymenoptera, Tenthredinidae). Notulae Entomologicae,49 : 231-246.

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

Prous, M., Liston, A., Mutanen, M. 2021. Revision of the West Palaearctic Euura bergmanni and oligospila groups (Hymenoptera, Tenthredinidae. Journal of Hymenoptera Research. http://zoobank.org/1459B177-AF2B-4D39-9483-E8BA21E70E67