Xyela curva, Benson, 1938

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 : 29

Xyela curva group

Diagnosis. Ovipositor sheath clearly curved downwards, tip round and knife-shaped with dorsal edge sloping down and ventral edge almost straight ( Figs 118–120 ); valvula 1 with small preapical dorsal tooth, distally with 12–14 oblique, closely spaced annuli, valvula 2 in distal half with 10–13 mostly vertical annuli and clear sclerotization on lateral wall around groups of sensilla campaniformia ( Figs 124–125 ); lateral lamella of valviceps vertical with proximal edge convex and distal base concave, distal flagella often projecting beyond distal lobe of valviceps ( Figs 136–139 ).

Species included. Xyela curva in the West Palearctic and X. exilicornis , X. japonica and X. occidentalis in the East Palearctic.

Figures

FIGURES 105–120. Ovipositor sheaths of Xyela species. All figures at same scale. Legend: HT—holotype; NT—neotype; 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 136–145. Penis valves of Xyela species: X. curva group, X. julii group (part). Figs 138–139 and 141 reproduced from Blank et al. (2005).