Euura microphyes ( Förster, 1854 )

Liston, Andrew, Vikberg, Veli, Mutanen, Marko, Nyman, Tommi & Prous, Marko, 2023, Palaearctic willow-catkin sawflies: a revision of the amentorum species group of Euura (Hymenoptera, Tenthredinidae), Zootaxa 5323 (3), pp. 349-395 : 374-376

Euura microphyes ( Förster, 1854)

Figures 9 , 10 , 15C–E , 18D

Nematus microphyes Förster, 1854: 344–345 . Described: holotype ♀ (ZSM, examined). Published type locality: near Aachen

[ Germany]. Amauronematus microphyes: Benson, 1962 . Amauronematus (Pontopristia) microphyes: Liston, 1995 . Euura microphyes: Sundukov, 2017 . Pontopristia romani Malaise, 1921: 14 . Described: syntypes, 2♀. Published type locality: Vassijaure, Lappland [ Sweden,

Vassijaure]. Lectotype designated below. Synonymy with Pontopristia microphyes by Lindqvist (1961).

Pontopristia brevilabris Malaise, 1921: 14 . Described: syntypes, ♀ (NHRS, examined). Published type locality [as comment under P. romani , p. 14]: Vassijaure , Lappland [ Sweden, Vassijaure]. Lectotype designated below. New synonym.

Nematus (Pontopristia) brevilabris: Zhelohovcev, 1988

Amauronematus (Pontopristia) brevilabris: Liston, 1995 .

Amauronematus fennicus Lindqvist, 1944: 33–34 . Described: syntypes, ♀ (FMNH; 1 specimen examined). Published type locality: Fredriksberg bei Helsingfors [ Finland, Helsinki-Pasila]. New synonym.

Pontopristia fennicus Lindqvist, 1949: 68 . Misspelling.

Pontopristia nana Lindqvist, 1949: 68–69 . Described: holotype ♀ (FMNH, examined), paratype ♀. Published type locality: Fredriksberg bei Helsingfors [ Finland, Helsinki-Pasila]. Synonymy with Pontopristia microphyes by Lindqvist (1961).

Amauronematus latiserra: Benson 1960b , misidentification; from Switzerland.

Pontopristia boreoalpina Lindqvist, 1961: 77 . Described: holotype ♀ (BMNH, not examined), paratypes, ♀. Published type locality: Schweiz, Valais, Verpecle [sic!] [ Switzerland, Valais, Ferpècle]. New synonym.

Pontopristia punctulata Lindqvist, 1961: 77–78 . Described: holotype ♀ (NHRS, examined), paratypes ♀ ♁. Published type locality: Swedish Lapland. Secondary homonym in Euura of Nematus punctulatus Thomson, 1863 (= Euura vaga ( Fabricius, 1781)) . New synonym.

Nematus (Pontopristia) punctulatus: Zhelohovcev, 1988

Amauronematus (Pontopristia) punctulata: Liston, 1995 ; misspelling.

Euura suecica Blank & Taeger , in Prous et al. 2014: 54. Replacement name for Pontopristia punctulata .

Nematus (Pontopristia) boreoalpinus: Zhelohovcev 1988 .

Amauronematus boreoalpina: Taeger et al. (2006) , misspelling.

Amauronematus pyrenaeus Lacourt, 1995: 66–67 . Described: holotype ♀ (MNHM, not examined), 2♀ paratypes ( Collection T. Noblecourt , 1 examined). Published type locality: Port d’Envalira (Andorre) [ Andorra]. New synonym.

Pontopristia pyrenaena: Lacourt, 1999: 10 , misspelling.

Pontopristia pyrenaica: Lacourt, 1999: 295 , misspelling.

Amauronematus (Pontopristia) boreoalpina: Liston (1995: 147) , misspelling.

Amauronematus (Pontopristia) boreoalpinus: Taeger et al. (2006: 408) .

Euura boreoalpina: Prous et al. (2014: 53) .

Diagnosis. Female: The very narrow valvulae 3 (apical width 0.9–1.0 × narrowest distal width of metatibia) helps to distinguish E. microphyes from other species of the amentorum group. Also characteristic is the comparatively short and high lamnium of the lancet, with only 15–16 annular sutures.

Male: The penis valve is very similar to that of E. freyja , except for the narrower base of the valvispina in E. microphyes . If the extensively pale colour of abdominal sterna 6, 7 and 9 in E. freyja proves to be a stable character, this might distinguish it (only sternum 9 pale in E. microphyes ).

Description. Female ( Fig. 9A–B ). Body length 3.3–5.0 mm. Black. Pale are more or less mandibles, palps, labrum, tibiae, apices of femora, cerci. Wing veins including fore wing pterostigma pale.

Head ( Fig. 9C ). In dorsal view moderately to strongly contracted behind eyes, and length posterior of eye about 0.4–0.5 × length of eye. Mostly dull with coriaceous sculpture except for labrum. Upper head densely setose; setae pale, about as long as anterior ocellus diameter. Clypeus slightly emarginate medially ( Fig. 9D ). Antenna 0.94–1.03 × 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 1.50 × as long as greatest width. Mesoscutellum as broad as long, without longitudinal median furrow; with few, extremely weak punctures; smooth and shiny. Mesepisternum smooth, shiny; with posterior-ventral glabrous patch; setae about 0.7 × as long as diameter of anterior ocellus.

Abdomen. Valvulae 3 in lateral view ( Fig. 9F ) clearly orientated upwards; tapering to the narrowly rounded tip. In dorsal view ( Fig. 9E ) subparallel-sided, widened slightly just before apex; apical width 0.9–1.0 × narrowest distal width of metatibia. Cercus reaches to tip of valvula 3, or just past it. Lancet ( Fig. 15C–E ): 15–16 annular sutures; lamnium short and high; moderately strongly curved (lower edge concave); serrulae short and strongly protruding on all but most basal 2 annuli; basal annular sutures without ctenidial serrulae. Base of tangium with a moderately developed lobe.

Male ( Fig. 10A ). Body length 3.4–4.2 mm. As female, except: In dorsal view length of head posterior of eye 0.3 × length of eye ( Fig. 10B ). Antenna approximately as long as costa of fore wing, slightly tapered towards apex. Tergum 8 hollows deep and reaching almost to base of tergum. Procidentia nearly rectangular; projects beyond posterior margin of tergum ( Fig. 10C ). Abdominal sternum 9 paler than other sterna. Forewing costa and stigma dark. Penis valve ( Fig. 18D ): lobe on paravalva below valvispina small or absent; valvispina short and basally narrow.

Variability. The upper part of the mesepisternum is usually without noticeable sculpture, and shiny, but may sometimes be roughly sculptured and more or less matt, as in, for example the holotype female of Pontopristia punctulata and one male specimen (http://id.luomus.fi/GL.3416). The lobe at the base of the tangium varies from rather prominent ( Fig. 15C ) to weakly developed ( Fig. 15E ). The clypeus of females varies from completely black to largely pale.

Figures

FIGURE 9. Euura microphyes.A–C,F) ♀ paratype Amauronematuspyrenaeus DEI-GISHym12667.D) ♀lectotype Pontopristia brevilabris NHRS-HEVA000003674. E) ♀ http://id.luomus.fi/GP.3414. Scale bars 1 mm.

FIGURE 10. Euura microphyes. A–C) ♁ http://id.luomus.fi/GP.3416. Scale bar 1 mm.

FIGURE 15.Lancets.A–BEuura ursaminorn. sp.:A) holotypePR.513VV.B) paratype PR.514VV, anomaliesin annularsutures and serrulae arrowed. C–E Euura microphyes: C) PR.498VV. D) Amauronematus pyrenaeus paratype DEI-GISHym12667. E) PR.512VV, anomalies in annular sutures arrowed.

FIGURE 18. Penis valves. A) Euura amentorum http://id.luomus.fi/GP.110189. B) E. pohjola n. sp. paratype ZMUO.030821, valvispina (upper) and lobe on paravalva (lower) arrowed. C) E. dahlbomi http://id.luomus.fi/GP.110188. D) E. microphyes 00244_KTP. E) E. freyja, 200693_BSP. F) E. freyja ZMUO.058316.