Euura oligospila (Forster, 1854)

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 : 138

191 Euura oligospila group

The species group was revised by Prous et al. (2021): see there for details of type material, synonymy, host plants, distribution, and identification characters.

Females of the group are extremely similar to those of E. bergmanni , E. respondens , and E. sylvestris of the E. bergmanni group. These E. bergmanni group species tend to have a basal extension at the base of tangium (forming a concavity at the base of tangium), which seems to be absent in the oligospila group (this was overlooked by Prous et al. 2021). There may be some small additional differences between the lancets of the E. oligospila group and E. bergmanni and E. respondens (see Prous et al. 2021). Euura sylvestris seems to have a longer malar space (more than 1.4 times as long as diameter of front ocellus), usually less deeply emarginate clypeus, and more rectangular head in dorsal view than oligospila group (malar space usually less than 1.4 times as long as diameter of front ocellus). Penis valves enable more reliable separation of the oligospila group from the bergmanni group and the other Euura . The valviceps in the oligospila group is basally about as broad as apically, has a weak or distinct constriction in the middle, and the invagination between valvispina and paravalva is indistinct ( Prous et al. 2021). Two species are recognised.