Euura dispar (Zaddach, 1876)

EUURA BERGMANNI GROUP

Euura dispar - Disparate Birch Nematine

Nematus dispar Zaddach, 1876
Pteronidea pseudodispar Lindqvist, 1969
Nematus pseudodispar (Lindqvist, 1969)
Euura pseudodispar (Lindqvist, 1969)

Scattered records north to northern Scotland. This species was not recognised by Benson (1958) and so older records are likely to have gone unnoticed. 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. Females are extremely difficult to identify reliably but males can be named via Prous et al. (2021), and a number of recent identifications have been made using this reference (Musgrove, 2024).

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.

Jump to other Euura bergmanni group species

Size: 4.5 to 9mm

GB IUCN status: Data Deficient
GB rarity status: Unclear

Distribution: England, Scotland

Flight period: Assumed May to June, July to September

Plant associations: Betula spp. (birches)