Bioramix (Leipopleura) baxoica, Bai & Ren, 2020

Bai, Xing-Long & Ren, Guo-Dong, 2020, Revision of the genus Bioramix Bates, 1879 (Coleoptera: Tenebrionidae: Platyscelidini) from China, Zootaxa 4815 (1), pp. 1-102 : 22-23

Bioramix (Leipopleura) baxoica sp. nov.

( Figs 6 , 64–65 , 225–226 , 366 )

Description. Body black-brown, shining, antennae, palpi and tarsi brown, elytral surface with metallic sheen.

Male ( Figs 6 , 64–65 , 225 ). Head. Anterior margin of epistome straight, surface with dense and coarse punctures. Frons and genae weakly convex, surface with dense and coarse punctures. Dorsal surface of head with dense and coarse punctures. Eyes transverse, anterior margin shallowly emarginate. Antennae ( Fig. 6 : A) not reaching pronotal base, antennomeres II–VIII short cylindrical and thicker at apex, IX–X nearly spherical, XI sharped-oval. Length (width) ratio of antennomeres II–XI 22 (15): 38 (18): 26 (17): 25 (18): 26 (18): 29 (20): 29 (21): 27 (21): 26 (21): 28 (20).

Prothorax. Pronotum ( Fig. 6 : B) transverse and convex, 1.5 times as wide as long and 1.9 times as wide as head. Lateral sides widest anterior to base, arcuately narrowing toward base and apex. Ratio of width at anterior margin to widest part and base 23: 38: 36. Anterior margin straight, posterior one weakly protruding backward at middle. Anterior and posterior angles obtuse. Anterior and posterior margins edged laterally, entire lateral margins edged. Dorsal surface with sparse and moderately coarse punctures on disc, dense and coarse at sides. Lateral sides weakly flattened from base to middle. Prothoracic hypomera with longitudinal wrinkles and sparse yellow setae. Prosternum anterior to procoxae with yellow setae, prosternal process sharply sloping behind procoxae, apex not projecting beyond level of procoxae in lateral view.

Pterothorax. Elytra wide-oval and weakly convex, 1.3 times as long as wide and 1.2 times as wide as pronotum, base slightly wider than pronotum and widest at middle. Surface with sparse and fine punctures, fine wrinkles, traces of longitudinal carinae. Lateral margins of elytra merging with outer margins of epipleura anterior to apex of elytra and reaching sutural angle, visible at base in dorsal view.

Abdomen with dense yellow setae, ventrites 1–2 depressed at middle.

Legs. Profemora stout, with sparse punctures and yellow setae. Protibiae ( Fig. 6 : D) gradually widened toward apex, underside concave at apex, apical margin foliate extended, inner side with dense yellow hairbrush from middle to apex. Protarsi ( Fig. 6 : C) narrower than apex of protibiae. Meso- and metafemora longer than profemora. Mesotibiae ( Fig. 6 : E) gradually widened toward apex, with yellow setae and rufous thick setae. Mesotarsi ( Fig. 6 : F) narrower than apex of mesotibiae. Metatibiae ( Fig. 6 : G) straight or weakly curved, with rufous thick setae, inner side with dense yellow hairbrush from middle to apex. Length (width) ratio of pro-, meso- and metafemora 18 (7): 23 (6): 26 (6), that of corresponding tibiae 19 (7): 18 (5): 26 (5), and protarsi 21 (27): 36 (53): 26 (48): 17 (32): 46 (16), mesotarsi 25 (30): 37 (45): 28 (40): 22 (26): 44 (15), metatarsi ( Fig. 6 : H) 70 (18): 38 (19): 29 (17): 46 (16).

Aedeagus ( Figs 6 : I–J, 64–65) 2.6 mm long and 0.7 mm wide. Parameres 1.0 mm long and 0.6 mm wide, widest at base and narrowing toward apex, lateral sides emarginate posterior to apex in dorsal view, “S” curved in lateral view.

Female ( Fig. 226 ). Body wider, abdominal ventrites 1–2 neither depressed nor flattened at middle, pro- and mesotarsi not widened, other characters similar to male.

Measurements. Body length: ♂ 8.7–9.4 mm, ♀ 8.3–9.1 mm and width: ♂ 4.3–4.7 mm, ♀ 4.7–4.9 mm.

Type material. Holotype: ♂ ( MHBU), CHINA : Xizang: Ra’og Town , Baxoi County, 29.5695° N, 96.7632° E, 4191 m, 22.VII.2009, Guo-Dong Ren, Yi-Bin Ba & Yong Zhou leg. Paratypes: 70♂♂, 54♀♀ ( MHBU), same data as holotype ; 5♂♂, 2♀♀ ( IZCAS), Ra’og Co, Ra’og Town , Baxoi County, 3934 m, 31.VIII.2015 N[ight], 29.5020° N, 95.7327° E, Hong-Bin Liang & Zheng-Zhong Huang leg. ; 1♂, 2♀♀ ( MHBU), Ye La Shan , Baxoi County, 4700 m, 15.VII.2008, Guo-Dong Ren et al. leg .; 2♂♂, 2♀♀ ( MHBU), Ye La Shan , Baxoi County, 27.VI.2011, Xiao-Yu Zhu leg. [ CXYZ]; 8♂♂, 4♀♀ ( MHBU), Ye La Shan , Baxoi County, 30°09.403′ N, 97°18.654′ E, 4640 m, 4.VIII.2017, Xing-Long Bai, Zhong-Hua Wei & Xian-Lei Shao leg. ; 2♂♂ ( MHBU), Ye La Shan, Bangda Town , Baxoi County, 4658 m, 28.VII.2011, Guo-Dong Ren et al. leg .; 1♂ ( MHBU), Yiqing Township , Baxoi County, 21.VII.2009, Guo-Dong Ren, Yi-Bin Ba & Yong Zhou leg. ; 1♂ ( MHBU), Lang La Shan , Baxoi County, 30°40.413′ N, 97°12.775′ E, 4523 m, 10.VIII.2016, Xiu-Min Li, Xing-Long Bai, Run-Yang Zhang & Xian-Lei Shao leg. ; 5♂♂, 7♀♀ ( MHBU), Kading Village, Tongka Town , Baxoi County, 30°35.712′ N, 96°36.210′ E, 4209 m, 28.VII.2019, Guo-Dong Ren, Xing-Long Bai, Ya-Lin Li, Ming-Min Ma & He Shi leg. ; 1♀ ( MHBU), Mopo La Shan , Luolong County, 30°51.773′ N, 96°33.909′ E, 5220 m, 10.VIII.2015, Guo-Dong Ren, Xing-Long Bai & Jun-Sheng Shan leg. ; 7♂♂, 8♀♀ ( MHBU), Chashuo La Shan, Lajiu Township , Luolong County, 30°28.714′ N, 95°53.593′ E, 4680 m, 30.VII.2019, Guo-Dong Ren, Xing-Long Bai, Ya-Lin Li, Ming-Min Ma & He Shi leg.

Distribution. China: Xizang.

Diagnosis. This new species is similar to Bioramix (Leipopleura) lhozhagensis sp. nov. (see diagnosis of B. lhozhagensis ) and Bioramix (Leipopleura) cupreoviridis sp. nov., but can be distinguished from the latter by the following characters (based on male): (1) pronotal punctures coarser, posterior margin weakly protruding backward at middle (finer, more strongly in B. cupreoviridis ); (2) elytral surface convex, lateral margins reaching sutural angle and visible at base (more flattened, not reaching and invisible in B. cupreoviridis ); (3) parameres narrow and long, “S” curved in lateral view (wider, distal part curved dorsally in B. cupreoviridis ).

Etymology. This species name is derived from the type locality—Baxoi.

Figures

FIGURES 5–6. Characters. 5. Bioramix tenuitarsus (male), 6. B. baxoica (male): A. antenna; B. pronotum; C. protarsi; D. protibiae; E. mesotibiae; F. mesotarsi; G. metatibiae; H. metatarsi; I–J. aedeagus in dorsal and lateral view.

FIGURES 49–73. Parameres of male aedeagus in dorsal and lateral view. 49–50. Bioramix splendida; 51–52. B. subaenescens; 53–55. B. szetschuana; 56–57. B. kulzeri (= B. szetschuana, photograph by Christoph Germann, without measuring scale); 58–59. B. tenuitarsus; 60–61. B. aenescens; 62–63. B. banbarensis; 64–65. B. baxoica; 66–67. B. crypticoides; 68–69. B. cupreoviridis; 70–71. B. exsertigenae; 72–73. B. frivaldszkyi.

FIGURES 220–225. Habitus. 220. Bioramix tenuitarsus (male, holotype); 221–222. B. aenescens (males; 221. lectotype, photograph by Keita Matsumoto); 223–224. B. banbarensis (males; 223. holotype; 224. paratype); 225. B. baxoica (male, holotype).

FIGURES 226–231. Habitus. 226. Bioramix baxoica (female, paratype); 227–228. B. crypticoides (males; 227. lectotype); 229–230. B. cupreoviridis (229. male, holotype; 230. female, paratype); 231. B. exsertigenae (male, holotype).

FIGURES 364–368. Habitat. 364. Bioramix reinigi; 365. B. igori; 366. B. baxoica; 367–368. B. seidlitzi in Yiqing Township, Baxoi County, Xizang, China.