259 Euura variator (Ruthe, 1859) Figs 266–267, 476–477 Nematus variator Ruthe, 1859: 308–310. Lectotype designated below. Amauronematus godmani Benson, 1955: 104–105. Syn. nov. Amauronematus galbiventris Lindqvist, 1960a: 130. Syn. nov. Amauronematus longidens Lindqvist, 1962b: 13. Synonymy by Hellén (1970). Diagnosis Females are most similar to E. fasciata and E. obscuripes (toeniata group); see differences discussed under these species. Males might not always be distinguishable from those of the E. obscuripes (toeniata group) and vittata group specimens found in the same (sub)arctic habitats. Female 5.0– 7.5 mm. Tegula pale or sometimes mostly black, metafemur usually completely or mostly pale, sometimes mostly black, abdomen ventrally extensively pale. Male 4.0–6.0(6.5) mm. Tegula and metafemur black or partly pale, subgenital plate pale or sometimes black. Best matches to godmani: ZMUO.044556 (female), ZMUO.059873, ZMUO.058922 (males). Type material examined Lectotype Nematus variator, here designated ICELAND • ♀; Staudinger leg.; ZMHB, http://coll.mfn-berlin.de/u/dbcac6 / GBIF-GISHym2822. Paralectotype Nematus variator ICELAND • 1 ♀; same data as for preceding; SDEI, GBIF-GISHym4103. Notes GBIF-GISHym2822 is 6.5 mm long; GBIF-GISHym4103 is 7.7 mm long. Holotype Amauronematus godmani SWITZERLAND – Valais • ♀; Ferpècle [Glacier]; 2100–2400 m a.s.l.; 22 Jun. 1935; J.E. and R.B. Benson leg,; BMNH, B.M.TYPEHYM.1.688. Notes ZMUO.044556 is nearly a perfect morphological match. Holotype Amauronematus galbiventris SWEDEN – Torne Lappmark • ♀; Abisko; 68.35° N, 18.83° E; 17–22 Jun. 1954; J.E. and R.B. Benson leg.; BMNH, B.M.TYPEHYM.1.785. Notes Length 6.5 mm. Holotype Amauronematus longidens FINLAND – Inari Lapland • 1 ♀; Utsjoki; 69.91° N, 27.03° E; 16 Jun. 1960; O. Ranin leg.; MZH, http://id.luomus.fi/GL.3412. Notes Length 5.5 mm. Host plants Salix glauca, S. helvetica Vill., S. lapponum, S. reticulata. Genetics COI Based on 35 specimens, maximum within-species distance is 4.56% and the nearest neighbours, diverging by a minimum of 0%, are Euura opacipleuris, E. fasciata, and E. semilactea. Nuclear Based on 30 specimens, maximum within-species distance is 0.98% (0.62% based on haplotypes of individual females). The nearest neighbour, diverging by a minimum of 0.37%, is Euura semilactea. Distribution and material examined Palaearctic. Specimens studied are from Austria, Finland, Iceland, Norway, Sweden, and Switzerland.

Published as part of 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), pp. 1-377 in European Journal of Taxonomy 977 on pages 185-186, DOI: 10.5852/ejt.2025.977.2799, http://zenodo.org/record/15019574