Euura opacipleuris (Konow, 1895)

Prous, Marko, Liston, Andrew, Monckton, Spencer K., Kramp, Katja, Vårdal, Hege, Vikberg, Veli, Heibo, Erik & Mutanen, Marko, 2025, West Palaearctic species of Euura Newman, 1837 (Hymenoptera, Tenthredinidae), European Journal of Taxonomy 977, pp. 1-377 : 172

242 Euura opacipleuris group

Closely related to the histrio and variator groups. Females have a narrow or triangular and pointed valvula 3 in dorsal view, long malar space (more than 2.0 times as long as diameter of front ocellus), and the lancet tends to be smaller (1.2–1.6 mm), less sclerotized and with thinner setae than in the histrio group (lancet length 1.4–2.6 mm), but is similar to the variator group. Valvula 3 in the variator group is in dorsal view less pointed at the apex and can appear rectangular. The malar space in the histrio group is usually less than 1.6 times as long as diameter of front ocellus. The lamnium is 2.5–3.2 times as long as the radix in the variator group, but 2.1–2.5 times as long in the opacipleuris group. Penis valves are not clearly distinguishable from the histrio group, but there seem to be slight differences to the variator group. The dorsal margin of the paravalva broadens more abruptly at the base of valvispina and the pseudoceps is narrower at its apex in the variator group than in the opacipleuris group. Two species are recognised.