Bioramix (Leipopleura) exsertigenae, 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 : 25-26

Bioramix (Leipopleura) exsertigenae sp. nov.

( Figs 8 , 70–71 , 231 )

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

Male ( Figs 8 , 70–71 , 231 ). Head. Anterior margin of epistome straight, surface with shallowly dense and moderately coarse punctures. Frons and genae weakly convex, surface with shallowly dense and fine punctures.Anterior margin of gena protruding outward anterior to eyes, distance between genae almost as long as that of eyes. Dorsal surface of head flattened, with shallowly dense and fine punctures. Eyes transverse, anterior margin shallowly emarginate. Antennae ( Fig. 8 : 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 27 (18): 37 (20): 23 (21): 23 (20): 24 (19): 22 (18): 30 (23): 24 (25): 27 (27): 34 (24).

Prothorax. Pronotum ( Fig. 8 : B) transverse and strongly convex, 1.5 times as wide as long and 1.9 times as wide as head. Lateral sides widest anterior to middle, nearly straight narrowing toward base and arcuately narrowing toward apex. Ratio of width at anterior margin to widest part and base 28: 42: 39. Anterior margin slightly emarginate, posterior one weakly protruding backward at middle.Anterior angles widely obtuse, rounded apically, posterior angles nearly rectangular. Anterior margin edged laterally, posterior margin not edged, entire lateral margins edged. Dorsal surface with shallowly sparse and fine punctures on disc, extremely dense at sides. Lateral sides very narrowly depressed along lateral margins 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 elongate-oval and strongly convex, 1.3 times as long as wide and 1.3 times as wide as pronotum, base wider than pronotum and widest at middle. Surface with shallowly sparse and fine punctures, shallowly 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 flattened at middle.

Legs. Profemora stout, with sparse punctures and yellow setae. Protibiae ( Fig. 8 : 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. 8 : C) narrower than apex of protibiae. Meso- and metafemora longer than profemora. Mesotibiae ( Fig. 8 : E) gradually widened toward apex, with rufous thick setae, inner side with dense yellow hairbrush from middle to apex. Mesotarsi ( Fig. 8 : F) narrower than apex of mesotibiae. Metatibiae ( Fig. 8 : G) weakly curved, with rufous thick setae, inner side with dense yellow hairbrush from middle to apex. Length (width) ratio of pro-, meso- and metafemora 21 (8): 25 (8): 30 (8), that of corresponding tibiae 21 (8): 21 (6): 30 (6), and protarsi 25 (25): 37 (60): 31 (60): 18 (43): 51 (21), mesotarsi 43 (31): 36 (52): 29 (46): 25 (31): 66 (22), metatarsi ( Fig. 8 : H) 87 (21): 46 (23): 35 (23): 71 (23).

Aedeagus ( Figs 8 : I–J, 70–71) 2.9 mm long and 0.8 mm wide. Parameres 1.1 mm long and 0.7 mm wide, widest at base and narrowing toward apex, “S” curved in lateral view.

Measurements. Body length: ♂ 10.4 mm and width: ♂ 5.3 mm.

Type material. Holotype: ♂ ( MHBU), CHINA: Xizang: Zanda Tulin , Zanda County, 31°34.345′ N, 79°53.145′ E, 4472 m, 25.VIII.2015, Guo-Dong Ren, Xing-Long Bai & Jun-Sheng Shan leg.

Distribution. China: Xizang.

Diagnosis. This new species is similar to Bioramix (Leipopleura) politicollis ( Kaszab, 1940) , but can be distinguished from the latter by the following characters (based on male): (1) anterior margin of gena protruding outward anterior to eyes, distance between genae almost as long as that of eyes (not protruding outward, much shorter than in B. politicollis ); (2) punctures of head and pronotum shallow and fine, lateral sides of pronotum very narrowly depressed along lateral margins from base to middle (deep and coarser, weakly flattened in B. politicollis ); (3) abdominal ventrites 1–2 flattened at middle (depressed in B. politicollis ); (4) metatibiae weakly curved (straight in B. politicollis ); (5) parameres more strongly “S” curved in lateral view.

Etymology. This species name is derived from its anterior margin of gena protruding outward anterior to eyes.

Figures

FIGURES 7–8. Characters. 7. Bioramix cupreoviridis (male), 8. B. exsertigenae (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 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).