Xyela alpigena (Strobl, 1895)

Blank, Stephan M., Shinohara, Akihiko & Altenhofer, Ewald, 2013, <strong> The Eurasian species of <em> Xyela </ em> (Hymenoptera, Xyelidae): taxonomy, host plants and distribution </ strong>, Zootaxa 3629 (1), pp. 1-106 : 18-19

Xyela alpigena group

Diagnosis. Ovipositor sheath usually straight, wedge-shaped, black, ventral edge more or less white, basal half diamond-shaped in cross-section, with narrowly rounded tip ( Figs 90 , 97–102 ), sensilla field in obliquely lateral position with 7–9 setae ( Fig. 91 ); valvula 2 with irregularly spaced groups of sensilla campaniformia surrounded by dense sclerotization protruding roundly from dorsal edge of valvula 2 ( Fig. 122 ); basal and medial lobe of penis valve protruding above level of distal lobe, basal lobe rounded on upper edge and slightly protruding above medial lobe, lateral lamella usually narrow with proximal and distal edges s-shaped ( Figs 3 , 129–134 ).

Species included. Xyela alpigena and X. peuce in the West Palearctic and X. kamtshatica , X. koraiensis , X. sibiricae and X. ussuriensis in the East Palearctic.

Figures

FIGURES 86–94. Ovipositor sheath, sensilla pattern and sensilla plate (spl) at the apex of the ovipositor sheath. 86, Xyela helvetica. 87, X. longula, arrows indicate the modified hairs at apex of valvula 1. 88, X. lugdunensis. 89, X. meridionalis. 90–91, X. alpigena. 92–93, X. curva. 94, X. densiflorae.

FIGURES 95–104. Ovipositor sheaths of Xyela species. All figures at same scale. Legend: HT—holotype; PT—paratype.

FIGURES 121–125. Distal section of ovipositors. 121, Xyela longula. 122, X. alpigena. 123, X. occidentalis (paratype). 124, X. curva. 125, X. rasnitsyni (paratype). Arrowheads in Figs 123–124 indicate preapical small tooth on dorsal edge of valvula 1.

FIGURES 2–5. Measurements and terminology of wing venation (see explanations on pp. 8–10). 2, Xyela rasnitsyni (paratype), ovipositor sheath (embedded in glycerine and therefore valvula 3 a little wider compared to dry, pinned specimens). 3, X. alpigena, penis valve. 4, X. curva, wings. 5, X. lugdunensis (paratype of X. nigroabscondita), fore wing.

FIGURES 126–135. Penis valves of Xyela species: X. longula groups, X. lugdunensis group, X. alpigena group, X. meridionalis group. 127, tentatively identified male of from Tence (France: Auvergne, MNHN), see text. 128, paratype of X. nigroabscondita.