Euura bipartita (Serville, 1823)

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 : 45

102 Euura bipartita group

Species in the group are generally rather similar to each other and can easily be confused with some species in the other groups (particularly myosotidis and flavescens groups). The saws and penis valves are also rather uniform. Saws can be quite similar also to some species in the myosotidis and flavescens groups, but penis valves can in most cases be more reliably distinguished from the species in the other Euura groups. Based on the similar type of saws (with short, tooth-like setae) and small subapical claw tooth, E. annulata , E. gehrsi , E. infirma , and E. taegeri can be distinguished reliably from species in the other groups of Euura , and also from the remainder in the E. bipartita group. Euura albipennis , E. caucasica , E. excisa , and E. punctifrons also have a small subapical claw tooth. Euura fuscodorsata , E. perkioemaekii and E. uda have a small or large subapical tooth, but not clearly bifid as in most other species of E. bipartita group. Some other species (especially males) can have a rather small subapical tooth, like E. scotonota and males of E. bipartita and E. poppii . Euura fuscarima females are the palest in the group (usually nearly completely pale like E. flavescens ). Females and males of E. albipennis and southern populations of E. bipartita typically have rather dark thorax and extensively yellowish abdomen, a colour combination that is rather unusual in Euura . Euura monticola is very similar to E. bipartita , but its antennae seem to be shorter and the abdomen is usually darker than in southern E. bipartita . Extensively pale are also E. connecta , E. leionota , E. lipovskyi , E. mimus , many specimens of E. poppii , and males of E. annulata , E. fuscarima , and E. fuscodorsata . Penis valves of some species in the group are rather distinctive, like those of E. acuminalis , E. infirma , E. uda , E. scotonota and E. declinata (the latter two are quite similar to each other). In most cases, a combination of colouration, claw, sawsheath, penis valve and saw characters enable separation of the species, but in some cases the differences are small or one of the sexes is not clearly identifiable. In many cases, the genetic data (mainly nuclear) separate the species more clearly.