Euura hypoxantha

185 Euura hypoxantha (Förster, 1854) Figs 206, 430 Nematus hypoxanthus Förster, 1854a: 313–314. Lectotype designated below. Nematus palliatus Thomson, 1863: 635. Lectotype designated below. Synonymy by Konow (1904e). Nematus orbitalis Cameron, 1884: 265–266. Syntypes ♀ ♂ (BMNH?), not examined. Type localities: United Kingdom, Scotland; Cadder Wilderness and Ballantrae, and Germany. Synonymy by Konow (1904e). Pteronidea nigronota Lindqvist, 1958: 102. Holotype ♀ (MZH?), not examined. Type locality: Finland, Munksnäs. Synonymy by Lindqvist (1959a). Diagnosis Females are most similar to E. jugicola. Mesepisternum is (usually?) extensively pale and black colour on abdominal terga decreases gradually from base to apex in E. hypoxantha, while mesepisternum is (usually?) black, and black colour on terga decreases abruptly from base to apex in E. jugicola. Also, the abdomen can be green in living E. hypoxantha females, but pink in E. jugicola. Details of the lancet (setae long and hair-like, all visible sutures in dorsal part inclined basally) and colouration (pale and round pterostigma, pale mesepisternum) should distinguish the species from the other Euura which have a lancet with the radix longer or about as long as lamnium. Males are extensively pale and have distinctive penis valves, with a large valvispina and a distinct hump dorsobasally. Type material examined Lectotype Nematus hypoxanthus, here designated GERMANY – Nordrhein-Westfalen • ♂; Aachen area; 50.77° N, 6.09° E; ZSM, DEI-GISHym3301. Lectotype Nematus palliatus, here designated SWEDEN – Skåne • ♀; Lund; 55.71° N, 13.19° E; MZLU, MZLU2017322. Host plants Many different Salix spp. (Taeger et al. 1998), less frequently Populus spp. (Chambers 1952). Genetics COI Based on 7 specimens, maximum within-species distance is 2.43% and the nearest neighbour, diverging by a minimum of 4.26%, is Euura poppii. Nuclear Based on 6 specimens, maximum within-species distance is 0.53% (0.19% based on haplotypes of individual females). The nearest neighbour, diverging by a minimum of 1%, is Euura jugicola. Distribution and material examined Palaearctic. Specimens studied are from Austria, Belgium, Estonia, Finland, Germany, Norway, Russia, and Sweden.