Axinoscymnus navicularis Ren et Pang, 1992

Peng, Feng, Xie, Xiufeng, Peng, Zhengqiang, Wang, Xingmin & Chen, Xiaoshen, 2022, A taxonomic review of the genus Axinoscymnus Kamiya, with descriptions of three new species (Coleoptera, Coccinellidae), Zootaxa 5154 (4), pp. 431-453 : 446-447

Axinoscymnus navicularis Ren et Pang, 1992

( Figs 10a–n )

Axinoscymnus navicularis Ren et Pang, 1992: 21 .— Yu et Lau 2001: 153, Pang et al. 2004: 90.

Diagnosis. This species is closed to A. nigripennis Kamiya in external appearance and male genitalia but can be distinguished from the latter by the yellowish brown pronotum bearing a black longitudinal stripe at the central part ( Figs 10a, 10d, 10g ). In A. nigripennis , pronotum is yellowish brown without any maculae ( Fig. 12a ).

Description. TL: 1.46–1.67 mm, TW: 1.03–1.12 mm, TH: 0.72–0.82 mm, TL/TW: 1.41–1.50, EL/EW: 1.09– 1.17, PL/PW: 0.50–0.54, HW/PW: 0.70–0.71, PW/EW: 0.65–0.67.

Body oval, moderately convex, dorsum with pale yellow pubescence ( Figs 10a–i ). Head black with slightly yellowish brown near labrum or all black ( Figs 10c, 10f ), antennae and mouthparts yellowish brown, tip of mandibles dark brown. Pronotum yellowish brown with a black or dark brown longitudinal stripe at middle ( Figs 10c, 10f, 10i ). Scutellar shield black. Elytra black ( Figs 10a–f ). Prothoracic hypomeron and prosternum brown. Mesoventrite and elytral epipleurae dark brown, metaventrite black. Legs yellowish brown.

Head with fine frontal punctures, as large as eye facets, 0.5–1.0 diameters apart. Eye densely faceted, interocular distance about 0.33 times of head width ( Figs 10c, 10f ). Pronotal punctures slightly larger than those on frons, 1.0–1.5 diameters apart. Surface of elytra with punctures much larger than those on pronotum, separated by 1.0–2.0 diameters.

Abdominal postcoxal lines complete and moderately recurved, reaching 4/5 length of ventrite 1 ( Fig. 10j ), area enclosed by the lines finely and sparsely punctate, irregularly distributed, broadly smooth along the lines; ventrite 1 with coarse and sparse punctures at middle.

Male genitalia. Penis short and slender, slightly broadened at base, apex pointed ( Fig. 10k ); tegmen with penis guide subtriangular, widest at base, gradually tapering to apex in lateral view ( Fig. 10l ), slightly longer than 2/3 length of parameres; penis guide in inner view subtriangular, widest at base, narrowing to apex ( Fig. 10m ); parameres stout and elongate oval with few setae at apex in lateral view ( Fig. 10l ).

Material examined. Holotype: Male, Fanjingshan , Guizhou, 21. VII. 1990, Ren SX leg ( SCAU, Fig. 10n ).

Other material. CHINA: Yunnan: 1♂, Longtan, Ximeng, ca 900 m, 9–10. V. 2008, Wang XM et al. leg. 1♂ 1♀, Tongbiguan , Yingjiang , 21. IX. 2006, Wang XM leg. 1♂ 1♀, Tongbiguan, Nabang, Yingjiang, ca 1000 m, 22–23. V. 2008, Wang XM et al. leg . Xizang: 1♂ 2♀, Xiachayu, Chayu, ca 1800 m, 14. X. 2007, Chen XS et al. leg. 1♂, Cibagou, Chayu, ca 2000 m, 13. X. 2007, Chen XS et al. leg. 1♀, 140 Km of Zamo Highway , Motuo, ca 900 m, 27. X. 2007, Chen XS et al. leg . Guangxi: 2♂ 3♀, Gaozhai, Maoershan Mountains, 20. X. 2004, Wang XM leg. 1♀, Jiuniutang , Maoershan Mountains , 18. X. 2004, Wang XM leg. Hunan: 1♀, Shennong Valley, Yanling , ca 650–800 m, 9. X. 2010, Wang XM et al. leg . LAOS: 1♂, Namha NBCA , Luang Namtha, ca 680 m, 18–21. VI. 2007, Wang XM et al. leg . NEPAL: 1♂ 3♀, Baitadi , Mahakali, ca 1965 m, 12. X. 2011, Chen XS et al. leg. 4♀, Bajhang , Seti, ca 1800 m, 13. X. 2011, Chen XS et al. leg. 1♀, Chitwan , Narayani, ca 240 m, 18. X. 2011, Chen et al. leg. 1♀, Silgadhi, Dipayal , Seti, ca 600 m, 11. X. 2011, Chen XS et al. leg .

Distribution. China (Guizhou, Yunnan, Xizang, Guangxi, Hunan, Hongkong); Laos; Nepal.

Remarks. This species is recorded from Laos and Nepal for the first time. We examined the holotype of this species, which is discolored and inconsistent with the original description in terms of body color.

Figures

FIGURE 10. Axinoscymnus navicularis Ren et Pang, 1992: a–c female d–i male g–i holotype a, d, g dorsal view b, e, h lateral view c, f, i frontal view j abdomen k penis l tegmen, lateral view m tegmen, inner view. n labels of holotype. Scale bars: a–i: 0.5 mm, j: 0.1 mm, k–m: 0.05 mm.

FIGURE 12. Axinoscymnus nigripennis Kamiya, 1965: a dorsal view b lateral view c frontal view d abdomen e penis f tegmen, lateral view g tegmen, inner view. Scale bars: a–c: 0.5 mm, d: 0.1 mm, e–g: 0.05 mm.