Bioramix (Leipopleura) rugelytra, 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 : 50-52

Bioramix (Leipopleura) rugelytra sp. nov.

( Figs 19 , 178–179 , 309–310 )

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

Male ( Figs 19 , 178–179 , 309 ). Head. Anterior margin of epistome weakly protruding forward, surface with dense and coarse punctures. Frons and genae weakly convex, surface with dense and coarse punctures. Dorsal surface of head flattened, with dense and coarse punctures. Eyes transverse, anterior margin shallowly emarginate. Antennae ( Fig. 19 : 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 21 (16): 37 (19): 24 (18): 25 (16): 22 (18): 23 (17): 24 (19): 22 (19): 23 (22): 29 (20).

Prothorax. Pronotum ( Fig. 19 : B) transverse and convex, 1.6 times as wide as long and 1.9 times as wide as head. Lateral sides widest at base, parallel to middle and arcuately narrowing toward apex. Ratio of width at anterior margin to basal 23: 39. Anterior margin weakly emarginate or nearly straight, posterior one weakly protruding backward at middle. Anterior angles obtuse, posterior ones weakly obtuse.Anterior and posterior margins edged laterally, entire lateral margins edged. Dorsal surface with sparse and coarse punctures on disc, dense at sides. Lateral sides narrowly depressed 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 convex, 1.3 times as long as wide and 1.1 times as wide as pronotum, base slightly wider than pronotum and widest at middle. Surface wrinkled, with sparse, fine punctures and wrinkles, intervals between punctures convex. Lateral margins of elytra not reaching sutural angle, interrupted at middle, 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. 19 : 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. 19 : C) narrower than apex of protibiae. Meso- and metafemora longer than profemora. Mesotibiae ( Fig. 19 : E) gradually widened toward apex, with rufous thick setae, inner side with dense yellow hairbrush from middle to apex. Mesotarsi ( Fig. 19 : F) narrower than apex of mesotibiae. Metatibiae ( Fig. 19 : G) straight, with rufous thick setae, inner side with dense yellow hairbrush from middle to apex. Length (width) ratio of pro-, meso- and metafemora 18 (7): 20 (7): 24 (7), that of corresponding tibiae 18 (7): 17 (6): 25 (6), and protarsi 25 (25): 33 (48): 25 (45): 15 (31): 47 (17), mesotarsi 29 (25): 31 (38): 25 (34): 19 (25): 42 (16), metatarsi ( Fig. 19 : H) 66 (21): 35 (20): 28 (18): 52 (18).

Aedeagus ( Figs 19 : I–J, 178–179) 2.8 mm long and 0.6 mm wide. Parameres 1.0 mm long and 0.5 mm wide, widest at base and narrowing toward apex, distal part curved dorsally in lateral view.

Female ( Fig. 310 ). Body wider, abdominal ventrites 1–2 not flattened at middle, pro- and mesotarsi not widened, other characters similar to male.

Measurements. Body length: ♂ 8.3–9.1 mm, ♀ 8.0– 8.1 mm and width: ♂ 4.1–4.4 mm, ♀ 4.1–4.6 mm.

Type material. Holotype: ♂ ( MHBU), CHINA : Xizang: Sozhug Township, Nêdong District [formerly known as Nêdong County], Shannan City , 4420 m, 11.VII.2008, Guo-Dong Ren et al. leg . Paratypes: 2♂♂, 5♀♀ ( MHBU), same data as holotype .

Distribution. China: Xizang.

Diagnosis. This new species is similar to Bioramix (Leipopleura) subcarinata sp. nov. (see diagnosis of B. subcarinata ) and Bioramix (Leipopleura) cupreoviridis sp. nov., but can be distinguished from the latter by the following characters (based on male): (1) pronotum widest at base, lateral sides narrowly depressed, posterior margin more weakly protruding backward at middle (anterior to base, weakly flattened, more strongly in B. cupreoviridis ); (2) elytra more convex, surface wrinkled, without traces of longitudinal carinae (more flattened, smooth, with in B. cupreoviridis ); (3) lateral sides of parameres more straight in dorsal view (emarginate posterior to apex in B. cupreoviridis ).

Etymology. This species name is derived from its wrinkled elytra.

Figures

FIGURES 19–20. Characters. 19. Bioramix rugelytra (male), 20. B. seidlitzi (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 170–189. Parameres of male aedeagus in dorsal and lateral view. 170–171. Bioramix riwoqeica; 172–173. B. rubripes; 174–175. B. rufipalpis; 176–177. B. darbukensis (= B. rufipalpis); 178–179. B. rugelytra; 180–181. B. seidlitzi; 182– 183. B. subcarinata; 184–185. B. tiani; 186–187. B. yushuana; 188–189. B. pamirensis.

FIGURES 304–309. Habitus. 304. Myatis brevipilosum (= Bioramix rubripes, male, holotype); 305–306. Bioramix rufipalpis (males; 305. lectotype); 307–308. B. darbukensis (= B. rufipalpis, males; 307. holotype, photograph by Christoph Germann); 309. B. rugelytra (male, holotype).

FIGURES 310–315. Habitus. 310. Bioramix rugelytra (female, paratype); 311–312. B. seidlitzi (311. male, holotype; 312. female, paratype); 313–314. B. subcarinata (313. male, holotype; 314. female, paratype); 315. B. tiani (male, holotype).