Euura amerinae (Linnaeus, 1758)

Liston, Andrew D., Heibo, Erik, Prous, Marko, Vårdal, Hege, Nyman, Tommi & Vikberg, Veli, 2017, North European gall-inducing Euura sawflies (Hymenoptera, Tenthredinidae, Nematinae), Zootaxa 4302 (1), pp. 1-115 : 54

Euura amerinae group

= Euura Newman, 1837 sensu stricto

Diagnosis. Adult. In lateral view both mandibles similar (more or less gradually tapering to apex). Vein 2r-m always absent in both fore wings. Supraclypeal area densely setose. Antenna very short: ♀ shorter than costa of fore wing; ♂ not longer than costa of fore wing. Cercus at least 8× as long as medial width and reaching back at least nearly to apex of valvula 3. Lancet: long in relation to its height, tapering only slightly, and more or less curved. Penis valve ventrally without small spines.

Larva. Third abdominal segment with 3 dorsal annulets. Suranal plate without pseudocerci.

Gall. In buds, twigs, leaf-petioles or leaf-midribs. Many authors (e.g. Enslin 1915, Tullgren 1919) have reported that larvae of the species that leave their galls after they have finished feeding often bore into the twigs of the host to overwinter. The emergence of adults from twigs therefore does not necessarily mean that the larvae fed there, i.e. they may belong to any species of this group, not just those of the atra subgroup.

Phenology. All species are univoltine.