Xanthostigma xanthostigma (Schummel, 1832)

Wu, Zhigang & Liu, Xingyue, 2016, The species of the snakefly genus Xanthostigma (Raphidioptera: Raphidiidae) from China, Zoological Systematics 41 (1), pp. 109-116 : 113-115

Xanthostigma xanthostigma (Schummel, 1832) New record from China ( Figs 2 , 9–11 )

Raphidia xanthostigma Schummel, 1832: 12 . Type locality: Poland (Wroclaw: Breslau).

Raphidia londinensis Curtis, [1824] 1824 -1839: pl.37. Type locality: United Kingdom (England: London).

Rhaphidia chalybocephala Ratzeburg, 1844: 254 . Type locality: unknown.

Raphidia schummeli Girard, 1864: 673 . Type locality: France (Maisons-Laffitte).

Rhaphidilla germanica Steinmann, 1964: 222 . Type locality: unknown.

Rhaphidilla rapax Steinmann, 1964: 218 . Type locality: unknown.

Agulla trilobata Bartoš, 1965a: 87 . Type locality: Czech Republic (Jihomoravský: steppe near Pouzdřany ).

Agulla rostrata Bartoš, 1965b: 458 . Type locality: Moldova.

Male. Body length 9.6 mm; forewing length 8.0 mm, hindwing length 7.4 mm.

Head ( Fig. 2 ) ovoid, posteriorly tapering, black, slightly shiny blonde green; vertex medially with an indistinct reddish brown longitudinal stripe; clypeus yellow. Compound eyes grayish brown. Antennal sclerite yellow; antennae yellow, but flagellum with distal half pale brown. Mouthparts yellow; mandibles with distal half reddish brown.

Pronotum ( Fig. 2 ) long, slender, yellow, laterally with a pair of brownish longitudinal stripes; meso- and metathorax blackish brown, mesonotum medially yellow, metanotum with posterior margin of scutellum yellow. Legs yellow with yellowish long setae and brownish short setae. Wings hyaline; pterostigma pale yellow, medially crossed by a short oblique veinlet; veins brown, but longitudinal veins with proximal half yellow. Rs trifurcated distad.

Abdomen ( Fig. 2 ) blackish brown; all pregenital segments dorsally with a pair of yellowish vittae laterally and with a yellowish vitta centrally, yellow markings on terga 4–6 much larger; each sternum with posterior margin slightly yellow, and sterna 6-8 almost entirely yellow. Genital segments blackish brown, tergite 9 and ectoproct laterally with yellow markings. Tergite 9 ( Fig. 9 ) in lateral view nearly subtrapezoidal, in dorsal view with arcuately convex lateral margins and arcuately concaved posterior margin. Sternite 9 ( Fig. 10 ) present as a pair of tiny, slender sclerites. Gonocoxite 9 ( Fig. 11 ) longitudinally directed, nearly as long as tergite 9, about 2.5 times as long as wide, ventral margin with rows of dentation and medially with a laterally curved claw-like projection; gonostylus 9 elongate, slightly and arcuately incurved, terminally bearing a long spinous process and a short dentate process. Hypovalva ( Fig. 10 ) about 2/3 length of tergite 9, anterior portion deeply V-shaped, laterally with a pair of short subtriangular projections, remaining part slightly broaden posteriad, with rounded tip. Paramere ( Fig. 9 ) short and broad, located at dorsal portion of base of endophallus, in lateral view comma-shaped, in dorsal view with arcuate posterior incision. Gonarcus ( Fig. 11 ) paired, slender, laterally curved. Endophallus ( Fig. 11 ) slightly longer than tergite 9, bilobed distad, proximally with a pair of foliate sclerites, which bear rows of dentation. Ectoproct ( Figs 9–10 ) broad, anteriorly with an arcuate transverse suture, and strongly expanded ventrad, forming arcuate posterior incision in dorsal view.

Material examined. 1♂, China, Xinjiang, Beitun , 6 May 1963 ( ZJU) .

Distribution. China (Xinjiang); Iran, Mongolia; Austria, Bulgaria, Croatia, Czech, Denmark, Finland, Germany, Hungary, Liechtenstein, Moldova, Netherlands, Norway, Poland, United Kingdom, Slovakia, Slovenia, Romania, Russia, Switzerland.

Figures

Figures 1–2. Habitus of Xanthostigma spp. from China. 1. X. gobicola, male from Hebei. 2. X. xanthostigma, male from Xinjiang. Scale bars =1.0mm.

Figures 9–11. Xanthostigma xanthostigma (Schummel), male genital segments (based on Chinese specimen). 9. Lateral view. 10. Dorsal view. 11. Ventral view. Scale bars=0.5mm.