Euura longiserra

239 Euura longiserra (Thomson, 1863) Figs 257, 497 Nematus longiserra Thomson, 1863: 632. Lectotype designated by Saarinen (1948). Nematus leucodous Zaddach, 1884 in Brischke 1884: 132. Holotype ♂, probably destroyed (Blank & Taeger 1998). Type locality: Russia, Kaliningradskaya oblast, Wohlfr.-Zinten [Kornevo]. Synonymy by Konow (1890). Diagnosis The usually almost completely orange body (but sometimes dorsally extensively black), and pronounced and broad papilliform serrulae distinguish the females from the others in the longiserra group. Based on penis valves, males might not be clearly distinguishable from E. munda and E. neglecta, but sternum 9 might usually (?) be black in E. longiserra (pale in E. munda and E. neglecta). Type material examined Lectotype Nematus longiserra SWEDEN – Skåne • ♀; Kungsmarken, Södra Sandby; 55.72° N, 13.34° E; MZLU, MZLU2017292. Host plants Salix aurita, S. caprea (Zinovjev & Vikberg 1998), S. cinerea (Roller & Macek 2017; this study), and S. starkeana. Genetics COI Based on 6 specimens, maximum within-species distance is 0.91% and the nearest neighbours, diverging by a minimum of 0%, are Euura eiteli (DEI-GISHym84213), E. munda, and E. neglecta. Nuclear Based on 6 specimens, maximum within-species distance is 0.3% (0.39% based on haplotypes of individual females). The nearest neighbour, diverging by a minimum of 0.47%, is Euura neglecta. Distribution and material examined Palaearctic. Specimens studied are from Bulgaria, Finland, Germany, Sweden, and the United Kingdom.