Euura minivittata Prous & Liston & Monckton & Kramp & Vårdal & Vikberg & Heibo & Mutanen 2025, sp. nov.

266 Euura minivittata Prous & Mutanen sp. nov. urn:lsid:zoobank.org:act: 3E5BFFF5-0BEB-4DA4-A032-AB2E53439C66 Figs 86–87, 283, 487 Diagnosis The species is most similar to E. hulteni, E. hedstroemi, and pale specimens of E. tillbergi. The darker pterostigma (brown or dark brown) of E. minivittata sp. nov. can help to distinguish its females from these three species, but it might not always be reliable. The darker metafemur of E. minivittata should distinguish its females more reliably from E. hedstroemi and pale specimens of E. tillbergi (those having an extensively reddish thorax), which have a (nearly) completely pale metafemur. All the examined E. hulteni (at least 5 mm) and most E. hedstroemi females are larger than examined E. minivittata females (less than 5 mm). Males of E. minivittata might not be distinguishable from smaller specimens of E. hulteni, E. hedstroemi, and E. vittata. Etymology The species name, to be treated as a Latin adjective, refers to the smaller size (mini -) of the species compared to the others in the E. vittata subgroup. Type material Holotype FINLAND – Inari Lapland • 1 ♀; Utsjoki, Allasuolu; 69.7679° N, 26.1842° E; 4 Jul. 2018; M. Mutanen, N. Mutanen, A. Mutanen leg.; ex larva Salix sp.; ZMUO, ZMUO.037271. Paratypes FINLAND – Inari Lapland • 1 ♂; same data as for holotype; ZMUO, ZMUO.038882. – Kuusamo • 1 ♀; Kuusamo; 66.2479° N, 29.2577° E; 17 Jun. 2017; M. Mutanen leg.; ZMUO, ZMUO.031642. – Northern Ostrobothnia • 1 ♂; Oulu; 65.1008° N, 25.585° E; 10 May 2018; M. Mutanen leg.; ZMUO, ZMUO.035848. SWEDEN – Norrbotten • 1 ♀; Pajala, Peräjävaara; 67.259° N, 23.003° E; 160 m a.s.l.; 10 Jun. 2017; E. Heibo leg.; CEH, W17609. Description Female Body 4.2–5.0 mm. Colour extensively pale and black. Labrum pale; labial and maxillary palps brown; mandibles reddish-brown at apex, pale at base; clypeus, supraclypeal area, frontal area above frontal pit, temples, and orbits pale; frontal pit black or pale; postocellar area extensively or slightly pale; coxae apically extensively pale; trochanters and trochantelli pale; femora and tibiae more or less pale or brown, or dorsally and ventrally extensively black; fore and middle tarsi pale basally or ventrobasally (tarsomores 1 or 1–2); pronotum mostly pale; tegula pale; dorsal half of mesepisternum, median mesoscutal lobe laterally and posteriorly, lateral mesoscutal lobes medially and posterolaterally pale; mesoscutellum black or slightly pale centrally; metepisternum pale; pterostigma and costa brown or dark brown, costa apically and basally somewhat paler; sterna, hypopygium, valvifer 2, and terga 9–10 pale; terga 6–8 laterally pale; valvula 3 in lateral view centrally pale; cerci mostly or basally pale. Clypeus shallowly emarginate; frontal area between antennae flat, not angulate (“ Amauronematus - type ”); postocellar area about 2.5 times as broad as long; antenna distinctly or slightly shorter than costa; mesepisternum matt; claws bifid, subapical tooth shorter than apical; valvula 3 in dorsal view about as broad as long, not tapering, with blunt tip, with slight invagination and indistinct carina posteriorly. Lancet with 18–19 serrulae; serrulae papilliform, except basal 1–2 that are flat or almost flat; serrulae with numerous microdenticles, strongly protruding, and with indistinct cypsellae; hair-like setae about half as long as annulus length, except in basalmost annulus where setae are about one fifth as long as annulus and absent on apical 2–3 annuli. Male Body 4.4–4.6 mm. Colour mostly black, darker than female. Head nearly completely black or extensively pale: labrum pale; labial and maxillary palps brown; mandibles reddish-brown at apex, pale at base; clypeus, supraclypeal area, temples, orbits ventrally, dorsally, and posteriorly pale. Legs nearly completely black or extensively pale: coxae apically extensively pale; trochanters and trochantelli pale; femora anteriorly and posteriorly pale; fore and middle tibiae mostly (except somewhat brown dorsal margin) pale; fore and middle tarsi pale basally or ventrobasally (tarsomores 1 or 1–2). Pronotum posteriorly extensively pale; tegula extensively pale or black; pterostigma and costa dark brown or pterostigma with paler central area; with pale spot between costa and pterostigma and costa basally somewhat paler; sternum 9 pale, other sterna pale or black. Clypeus shallowly emarginate; frontal area between antennae flat, not angulate (“ Amauronematus - type ”); postocellar area about 2.5 times as broad as long; antenna about as long as or slightly shorter than costa and pterostigma combined; mesepisternum matt; claws bifid, subapical tooth shorter than apical; projection of tergum 8 distinct, about as long as broad or slightly broader than long and with truncate apex. Penis valve 1.1 mm, more or less right-angled between dorsal margin of paravalva and valvispina, ventroapical lobe of paravalva distinctly expanded and invagination between ventroapical lobe and valvispina indistinct. Host plants Salix sp., most likely S. phylicifolia, S. hastata, or both. Genetics COI Based on 5 specimens, maximum within-species distance is 1.09% and the nearest neighbour, diverging by a minimum of 1.06%, is Euura tillbergi. Specimens belong to BOLD:ACJ5443. The BIN includes also E. tillbergi, E. krausi, and E. vittata in part, but all specimens of E. minivittata sp. nov. form a clade within the BIN. Nuclear Based on 5 specimens, maximum within-species distance is 0.56% (0.24% based on haplotypes of individual females). The nearest neighbour, diverging by a minimum of 0.77%, is Euura hulteni. Distribution and material examined Palaearctic. Specimens studied are from Finland, and Sweden.