Euura squamicauda

164 Euura squamicauda (Vikberg, 1982) Figs 167, 392 Pteronidea caudalis Lindqvist, 1968: 194. Secondary homonym of Nematus caudalis Eversmann, 1847 [= Euura leucotrocha (Hartig, 1837)]. Nematus squamicauda Vikberg, 1982: 63. Replacement name for Pteronidea caudalis Lindqvist, 1968. Diagnosis Females (5.5–6.5 mm) are externally very similar to darker specimens of E. lienterica and many species in the bipartita group, but valvula 3 is orientated distinctly dorsally. Separation of males from darker specimens of the other flavescens group species is not clear. Contrary to the original description, the pterostigma is hardly bicolored. Type material examined Holotype Pteronidea caudalis SWEDEN – Torne Lappmark • ♀; Torneträsk; 68.22° N, 19.74° E; 400 m a.s.l.; R. Malaise leg.; NHRS, NHRS-HEVA000003965. Host plants Salix lanata L. based on three females (two of them sequenced) ovipositing in the male catkins. A sequenced larva (ZMUO.042092) was collected from Salix sp. where S. lanata was present. Genetics COI Based on 5 specimens, maximum within-species distance is 0.15% and the nearest neighbour, diverging by a minimum of 5.47%, is Euura dorsata. Nuclear Based on 5 specimens, maximum within-species distance is 0.13% (0.2% based on haplotypes of individual females). The nearest neighbour, diverging by a minimum of 1.65%, is Euura reticulata. Distribution and material examined Palaearctic. Specimens studied are from Finland, Norway, and Sweden.