Euura histriato Prous, Liston & Mutanen 2025, sp. nov.

231 Euura histriato Prous, Liston & Mutanen sp. nov. urn:lsid:zoobank.org:act: DF55C684-1E05-4B81-9BBF-4C9B3893E1F1 Figs 85, 252 Diagnosis Colour pattern (head extensively pale, mesepisternum dorsally pale, abdomen ventrally and apically pale), valvula 3 (broad in dorsal view) and lancet (ventrally concave, lamnium 2.2 times as long as radix [DEI-GISHym12305]) distinguishes the species from the others in the histrio group. Etymology The species name, a noun in apposition, is formed from a combination of the first letters of the names of hi strio and E. striat a, related species which can be found on the same host plant (Salix caprea). The final letter ‘o’ is chosen to provide a distinctive and euphonious name, although its correct use in Latin is normally restricted to second declension nouns in the dative. Type material Holotype BULGARIA – Rila Mts • ♀; 2 km SW of Borovets; 42.257° N, 23.586° E; 1500 m a.s.l.; 15 May 2022; A. Liston and M. Prous leg.; SDEI, DEI-GISHym12305. Paratypes BULGARIA – Rila Mts • 1 ♀; same data as for holotype; SDEI, DEI-GISHym12309. FINLAND – Regio aboensis • 2 ♀♀; Rymättylä, Aaslaluoto; 60.3114° N, 21.9766° E; 14 Jul. 2017 [larvae]; M. Mutanen leg.; ex larvae Salix caprea; ZMUO, ZMUO.033823, ZMUO.033826. A female specimen from Norway (bf-sym-00517 in BOLD) that has an identical barcode sequence might also belong to this species. Description Female Body 8.1–9.0 mm. Colour black with extensive pale markings. Whitish are base of mandibles, labrum, clypeus, malar space, supraclypeal area, tegula and most of pronotum; labial and maxillary palps brown; apex of mandibles dark reddish; reddish brown are inner and outer orbits, temples, postocellar area, frontal area in part, dorsal half of mesepisternum, median mesoscutal lobe laterally and posteriorly, lateral mesoscutal lobes medially and posterolaterally, and most or middle part of mesoscutellum; most of metapleuron yellowish; fore- and middle femora, tibiae, and tarsi mostly yellowish or dorsally black; hind tibia and tarsus completely black or hind tibia anteriorly and posteriorly slightly yellowish; hind femur anteriorly and posteriorly yellowish; trochanters and trochantelli extensively or mostly yellowish; coxae apically extensively or slightly yellowish; pterostigma centrally pale brown; abdomen ventrally, laterally, and apically (terga 8–10 completely or nearly completely) yellowish; in lateral view, valvula 3 centrally slightly or extensively yellowish; cerci basally slightly yellowish; other parts black. Clypeus distinctly emarginate; frontal area between antennae flat, not distinctly angulate (“ Amauronematus - type ”); postocellar area about 1.5–1.8 times as broad as long; antenna about as long as costa; mesepisternum matt; claws bifid; valvula 3 in dorsal view slightly tapering, slightly longer than broad at base, without posterior invagination. Lancet with 15–17 serrulae; lamnium 2.2 times as long as radix; serrulae triangular with indistinct microdenticles, not strongly protruding, and without cypsella; spine-like setae about half as long as annulus length, absent on basal most and apical 3–4 annuli. Male Unknown. Host plants Salix caprea. Genetics COI Based on 4 specimens, maximum within-species distance is 0% and the nearest neighbours, diverging by a minimum of 0.3%, are Euura hartigi, E. striata, E. opacipleuris, and E. variator. BOLD:AEA4613. Nuclear Based on 3 specimens, maximum within-species distance is 0.05% (0.11% based on haplotypes of individual females). The nearest neighbour, diverging by a minimum of 0.59%, is Euura amicula. Distribution and material examined Palaearctic. Specimens studied are from Bulgaria and Finland.