Euura gehrsi

115 Euura gehrsi (Konow, 1903) Figs 104, 338 Pachynematus gehrsi Konow, 1903a: 381 (key). Lectotype designated by Taeger & Blank (1998). Pachynematus freyi Lindqvist, 1949: 81–82. Lectotype designated below. Syn. nov. Diagnosis Most similar to E. annulata but generally darker. Serrulae and setae of the saw of E. annulata may be more prominent than in E. gehrsi. Males are more clearly distinguishable because of large differences in colouration (E. annulata males are extensively pale while E. gehrsi is mostly black). Also, the paravalva of the penis valve of E. annulata possibly narrows basally more abruptly compared to E. gehrsi. Type material examined Lectotype Pachynematus gehrsi GERMANY – Thüringen • ♀; Ohrdruf; 50.81° N, 10.74° E; 9 Jun. 1890; A. Frank leg.; SDEI, DEIGISHym12498. Lectotype Pachynematus freyi, here designated FINLAND – Inari Lapland • ♀; Utsjoki, Outakoski; 69.61° N, 25.98° E; 25 Jun. 1947; E. Lindqvist leg.; MZH, http://id.luomus.fi/GL.2448. Host plants Bistorta officinalis Delarbre (Macek et al. 2020; rearings by Alexey Zinovjev) and probably also Bistorta vivipara, because B. officinalis is not present in northern Fennoscandia. Genetics COI Based on 5 specimens, maximum within-species distance is 3.5% and the nearest neighbour, diverging by a minimum of 0.61%, is Euura annulata. Nuclear Based on 5 specimens, maximum within-species distance is 0.61% (0.47% based on haplotypes of individual females). The nearest neighbour, diverging by a minimum of 0.5%, is Euura annulata. Distribution and material examined Palaearctic. Specimens studied are from Finland, France, Germany, Norway, Russia, and Sweden.