Palaearctic willow-catkin sawflies: a revision of the amentorum species group of Euura (Hymenoptera, Tenthredinidae) Author Liston, Andrew Author Vikberg, Veli Liinalammintie 11 as. 6, 14200 Turenki, Finland. veli. vikberg @ pp. inet. fi Author Mutanen, Marko Ecology and Genetics Research Unit, PO Box 3000, 90014 University of Oulu, Finland. Author Nyman, Tommi 0000-0003-2061-0570 Department of Ecosystems in the Barents Region, Norwegian Institute of Bioeconomy Research, Svanvik, Norway. tommi. nyman @ nibio. no; https: // orcid. org / 0000 - 0003 - 2061 - 0570 tommi.nyman@nibio.no Author Prous, Marko 0000-0002-5329-7608 Ecology and Genetics Research Unit, PO Box 3000, 90014 University of Oulu, Finland. & Department of Zoology, Institute of Ecology and Earth Sciences, University of Tartu, Vanemuise 46, 51014 Tartu, Estonia. mprous @ ut. ee; https: // orcid. org / 0000 - 0002 - 5329 - 7608 mprous@ut.ee text Zootaxa 2023 2023-08-02 5323 3 349 395 http://dx.doi.org/10.11646/zootaxa.5323.3.2 journal article 10.11646/zootaxa.5323.3.2 1175-5326 8209552 BF09BB2F-150C-46D6-B9D2-D27163CA1A28 Euura freyja (Liston, Taeger & Blank, 2009 ) Figures 6 , 16A–B , 18E–F , Fig. 21F–G Pontopristia analis Lindqvist, 1961: 75–76 . Described: holotype ♀ (http://id.luomus.fi/GL.9215; originally private collection O. Ranin, incorporated in private collection V. Vikberg, and now deposited in MZH; examined), paratype ♁. Published type locality: Utsjoki [northern Finland ]. Secondary homonym in Euura and Amauronematus of Amauronematus analis Konow, 1897 (= Euura stenogaster ( Förster, 1854 )) . Nematus ( Pontopristia ) analis : Zhelohovcev, 1988 Amauronematus ( Pontopristia ) analis : Liston, 1995 . Pontopristia montana Lindqvist, 1961: 76–77 . Described: holotype ♀ (BMNH, examined), paratypes , ♀ ♁. Published type locality: Sweden , Abisko. Secondary homonym in Euura of Nematus montanus Zaddach, 1883 (= Euura montana (Zaddach, 1883)) . New synonym. Amauronematus ( Pontopristia ) montana : Liston, 1995 ; misspelling. Euura oreophila Liston & Prous , in Prous et al. 2014: 53 . Replacement name for P. montana . Amauronematus freyja Liston, Taeger & Blank in Blank et al. 2009: 9–10 . Replacement name for P. analis . Euura freyja : Sundukov, 2017 . Diagnosis. Female: Readily distinguished from other E. amentorum group females by its more slender body ( Fig. 6A ). Other useful characters are the distally wide valvulae 3 ( Fig. 6D : only similarly wide in E. amentorum ), and the blackish fore wing costa and pterostigma ( Fig. 6A–B ), at least in fresh specimens, which are only similarly dark in E. itelmena and E. pohjola sp. n. FIGURE 6. Euura freyja . A–D) ♀ DEI-GISHym31506. E–F) ♁ 200137_WCD. Scale bars 1 mm. Male ( Figs 6E–F ): Resembles E. microphyes , including penis valve, but valvispina in E. freyja basally broader. If a constant character, the more extensively pale apical abdominal sterna of E. freyja ( Fig. 6F : parts of 6 and 7 as well as 9) might distinguish it from other species (at most sternum 9 pale). Description. Female ( Fig. 6A–B ). Body length 4.0– 5.5 mm . Black. More or less pale are: labrum and mandibles; femora, tibiae, bases of tarsomeres 1; terga 9, 10, cerci, medial projection of hypopygium. Wing veins dark; fore wing pterostigma usually uniformly dark. Head. In dorsal view narrowed behind eyes, and length posterior of eye about 0.40 × length of eye. Mostly dull with coriaceous sculpture except for labrum and the nearly smooth and moderately shiny temples and upper inner orbits. Upper head sparsely setose; setae pale, about 0.3 × as long as anterior ocellus diameter. Clypeus slightly emarginate medially. Labrum apically rounded. Antenna 0.95–1.00 × as long as fore wing costa. Thorax. Pronotum, mesoscutum and tegula densely punctate with small shiny interspaces; vestiture similar to upper head, adpressed. Lateral mesoscutal lobe approximately 2.0 × as long as greatest width. Mesoscutellum as broad as long, without longitudinal median furrow; anterior densely punctate, posterior nearly impunctate. Mesepisternum unsculptured, shiny, with nearly uniform covering of setae, about 0.5 × as long as diameter of anterior ocellus. Abdomen. Valvulae 3 in lateral view ( Fig. 6C ) clearly orientated upwards; with subtruncate apex. In dorsal view ( Fig. 6D ) strongly widened distally; 1.8–2.0 × as wide as narrowest distal width of metatibia. Cercus clearly reaches back farther than tip of valvulae 3 ( Fig. 6C–D ). Lancet ( Fig. 16A–B ): 19–20 annular sutures; moderately strongly curved (lower edge concave); lamnium approximately 2 × as long as radix; distal marginal serrulae clearly lobed; proximal serrulae quite flat; basal annular sutures without ctenidial teeth. Tangium with a large, broad basal lobe. Male [based on 200137_WCD and ZMUO.058316] ( Fig. 6E–F ). Body length 3.9–4.3 mm . As female, except: Antenna 1.10–1.35 × as long as fore wing costa. Pale are: Abdominal sternum 9, more or less sterna 6 and 7, and cerci ( Fig. 6E–F ). Penis valve ( Fig. 18E–F ): Valvispina short and basally broad. Variability. [Female] Interior of fore wing pterostigma sometimes paler than margins. Tergum 9 from extensively pale (brown-red) to nearly completely dark. Tergum 10 more or less pale (whitish). Tegula usually completely black, but in one specimen narrowly pale on exterior margins. [Male] A lobe below the valvispina may be well-developed ( Fig. 18E ) or barely visible ( Fig. 18F ).