Xanthostigma gobicola U. Aspöck & H. Aspöck, 1990

Wu, Zhigang & Liu, Xingyue, 2016, The species of the snakefly genus Xanthostigma (Raphidioptera: Raphidiidae) from China, Zoological Systematics 41 (1), pp. 109-116 : 111-113

Xanthostigma gobicola U. Aspöck & H. Aspöck, 1990 ( Figs 1 , 3–8 )

Xanthostigma gobicola U. Aspöck & H. Aspöck, 1990: 97 . Type locality: Mongolia (Omnogovi: Churin-Chalka-Nuru).

Male. Body length 8.1–9.8 mm; forewing length 6.9–7.2 mm, hindwing length 6.2–6.6 mm.

Head ( Fig. 1 ) ovoid, posteriorly tapering, black, slightly shiny blonde green; vertex with three indistinct reddish brown longitudinal stripes at middle and lateral margins; clypeus pale brown, medially with a yellow subtriangular marking. Compound eyes grayish brown. Antennal sclerite yellow; antennae yellow, but flagellum pale brown except for proximal 6-8 flagellomeres yellow. Mouthparts yellow; mandibles with distal half pale brown, maxillary and labial palpi blackish brown.

Pronotum ( Fig. 1 ) long, slender, dark brown, respectively with a yellowish brown stripes on anteromedial and posteromedial portions, and posteriorly with a pair of yellowish longitudinal stripes near lateral margins; meso- and metathorax blackish brown, mesonotum medially with a yellow subtriangular marking on anterior margin and with scutellum yellow, metanotum with only scutellum yellow. Legs yellow with brownish setae, distal two tarsomeres blackish brown. Wings hyaline; pterostigma pale yellow, medially crossed by a short oblique veinlet; veins blackish brown, proximal half of C and R veins yellow. Rs trifurcated distad.

Abdomen ( Fig. 1 ) blackish brown; all pregenital segments dorsally with a pair of yellowish vittae laterally and with a yellowish vitta centrally; each sternum with a transverse yellowish marking posteriorly. Genital segments blackish brown, tergite 9 with yellowish markings on posteromedial and lateral margins, ectoproct laterally with yellowish markings. Tergite 9 ( Fig. 3 ) in lateral view nearly rectangular, in dorsal view with arcuate lateral margins and posterior incision. Sternite 9 present as a pair of tiny, slender sclerites. Gonocoxite 9 ( Fig. 5 ) longitudinally directed, nearly as long as tergite 9, about 2.5 times as long as wide, ventral margin without claw-like process or dentation; gonostylus 9 elongate, slightly and arcuately incurved, terminally bearing two short, hook-like processes. Hypovalva ( Fig. 4 ) about 2/3 length of tergite 9, anterior portion laterally extending into an arcuate beam, remaining part narrowly blade-like. Paramere ( Fig. 5 ) narrow, located at dorsal portion of base of endophallus, with dense tiny dentation. Gonarcus absent. Endophallus ( Fig. 5 ) slightly longer than tergite 9. Ectoproct ( Figs 3 , 5 ) broad, anteriorly with an arcuate transverse suture, and strongly expanded posteroventrad, forming subtrapezoidal posterior incision in dorsal view.

Female. Body length with ovipositor 11.6–14.6 mm, body length without ovipositor 8.1–11.4 mm; forewing length 7.7–8.9 mm, hindwing length 7.1–7.9 mm.

Sternite 7 ( Figs 6–7 ) subtrapezoidal in lateral view and nearly rectangular in ventral view, with truncate posterior margin. Tergite 8 with nearly truncate anterior margin and arcuate posteroventral margin in lateral view. No subgenitale discernible. Ectoproct in lateral view nearly rectangular, slightly wider than long. Atrium bursae ( Fig. 8 ) richly pleated, laterally bearing a pair of slender, anteriorly protruding lobes, with broad transition into sacculus bursae which extends into segment 7 and narrowed anteriorly; receptaculum seminis ( Fig. 6 ) slightly shorter than sacculus bursae, distally globally broadened; glandulae receptaculi ( Fig. 6 ) distally with two bulbs on each short thread-like stalk.

Material examined. CHINA: 1♂, Beijing, Mentougou, Baihuashan , 1 200 m, 30 June 2005, Mingxia Sun ( CAU) ; 4♀, Beijing, Mentougou, Baihuashan , 1 200 m, 30 May 1973, Yongshan Shi ( IZCAS) ; 2♂ 2♀, Beijing, Mentougou, Xiaolongmen , 19 June 1988, Weiwei Zhang ( CAU) ; 1♀, Beijing, Mentougou, Xiaolongmen , 14 July 2005, Kuiyan Zhang ( CAU) ; 1♂ 1♀, Beijing, Mentougou, Longmenjian , 3 June 2004, Weihai Li ( CAU) ; 2♂ 3♀, Beijing, Mentougou, Longmenjian , 3 June 2004, Xingyue Liu ( CAU) ; 1♀, Beijing, Mentougou, Longmenjian, Guigu , 4 June 2004, Xingyue Liu ( CAU) ; 1♂ 1♀, Beijing, Mentougou, Xiaolongmen , 8 June 2004 ( CAU) ; 1♀, Beijing, Mentougou, Xiaolongmen , 9 July 2011, Ulrike Aspöck (CAU) ; 1♂ 4♀, Beijing, Yanqing, Songshan, Feng Yuan ( CAU) ; 2♀, Beijing, Yanqing, Songshan , 850 m, 14 July 2003, Xunan Shan ( CAU) ; 6♂ 2♀, Beijing, Miyun, Potoulinchang , 23 May 2004, Feng Yuan ( CAU) ; 1♀, Beijing, Changping, Huyu , 22 May 2011, Xingyue Liu ( CAU) ; 5♂ 3♀, Beijing, Yanqing, Songshan , 2/ 3 June 2010 ( CAU) ; 2♂ 3♀, Hebei, Yuxian, Xiaowutaishan , 29 June 2005, Xingyue Liu ( CAU) ; 3♂ 2♀, Hebei, Yuxian, Xiaowutaishan , 29 June 2005, Hongxia Liu ( CAU) ; 2♂, Hebei, Yuxian, Xiaowutaishan, Jinhekougou , 1 June 2004, Xingyue Liu ( CAU) ; 2♀, Hebei, Yuxian, Xiaowutaishan , 1 200 m, 26/ 27 July 2000, Yue Zhang & Peng Wang ( CSUFT) ; 2♂ 5♀, Hebei, Yuxian, Xiaowutaishan, Jinhekougou , 29 June 2004, Xingyue Liu ( CAU) ; 1♂ 2♀, Hebei, Yuxian, Xiaowutaishan, Jinhekougou , 1 June 2004, Xingyue Liu ( CAU) ; 3♂ 1♀, Hebei, Yuxian, Xiaowutai , 29 June 2005, Hui Dong ( CAU) ; 1♂, Hebei, Zhuolu, Yangjiaping , 3 July 2005, Xingyue Liu ( CAU) ; 1♂, Hebei, Chengde, Wulingshan, Dujuanfeng , 7 July 2008, Yan Li ( CAU) ; 1♂ 2♀, Hebei, Chengde, Wulingshan, Dagou , 23 May 2013, Wei Zhang ( CAU) ; 2♀, Ningxia, Helanshan, Xiaokouzi , 27 May 1987 ( CAU) ; 1♀, Ningxia, Helanshan, Suyukou , 2 000 m, 4 July 2007, Gang Yao ( CAU) ; 1♂, Neimenggu, Helanshan, Beisi , 2 000 m, 7 July 2007, Gang Yao ( CAU) ; 1♀, Neimenggu, Helanshan, Beisi , 5 September 1990 ( CAU) ; 1♀, Neimenggu, Helanshan, Nansi , 3 200 m, 29 July 2013, Xiumei Lu ( CAU) ; 1♀, Neimenggu, Helanshan, Halawumigou , 2 244 m, 30 July 2010, Meiying Lin ( CAU) ; 1♀, Neimenggu, Helanshan, Xuelingzi, Nansi , 2 160 m, 29 July 2010, Aimin Shi & Guangyu Zhao ( CAU) ; 1♀, Neimenggu, Saihanwula, Zhenggou , 1 200 m, 23 July 2013, Xiumei Lu ( CAU) ; 1♂, Shaanxi, Huashan , 1963, Io Chou ( CAU) ; 1♀, Shaanxi, Ganquan, Qingquan , 26 June 1971, Chikun Yang ( CAU) ; 1♂, Yuhianghien , 18 May 1916 ( CAU) ; 1♀, Yaot’eou , 6 June 1916, Matindife Navin ( CAU) .

Distribution. China (Beijing, Hebei, Shanxi, Shaanxi, Ningxia, Neimenggu); Mongolia.

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 3–4. Xanthostigma gobicola Aspöck & Aspöck, male genital segments. 3. Dorsal view. 4. Ventral view. Abbreviation. T&S8–9, tergite and sternite 8–9; e, ectoproct; gx9, gonocoxite 9; hv, hypovalva (= gonapophyses 9); gst 9, gonostylus 9. Scale bars =0.5 mm.

Figures 5–8. Xanthostigma gobicola Aspöck & Aspöck. 5. Male genital segments, lateral view. 6. Female genital segments, lateral view. 7. Female sternite, ventral view; 8. Atrium bursae, dorsal view. Abbreviation. T&S7–9, tergite and sternite 7–9; e, ectoproct; gx9, gonocoxite 9; hv, hypovalva (= gonapophyses 9); ep, endophallus; gst 9, gonostylus 9; o, ovipositor. Scale bars=0.5 mm.