Bioramix (Leipopleura) rectiangulata, 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 : 43-45

Bioramix (Leipopleura) rectiangulata sp. nov.

( Figs 17 , 108–109 , 266–267 )

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

Male ( Figs 17 , 108–109 , 266 ). Head. Anterior margin of epistome nearly 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. 17 : 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 18 (13): 28 (15): 21 (15): 18 (15): 18 (15): 19 (16): 25 (16): 22 (18): 22 (20): 30 (21).

Prothorax. Pronotum ( Fig. 17 : B) transverse and strongly convex, 1.5 times as wide as long and 1.7 times as wide as head. Lateral sides widest anterior to middle, arcuately narrowing toward base and apex, weakly emarginate anterior to base. Ratio of width at anterior margin to widest part and base 23: 34: 33. Anterior margin weakly emarginate, posterior one sinuate. Anterior angles obtuse, posterior angles rectangular, sharped apically. Anterior and posterior margins edged laterally, entire lateral margins edged. Dorsal surface with sparse and fine punctures on disc, larger at sides. Lateral sides narrowly depressed from base to middle occasionally. 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 1.3 times as wide as pronotum, base wider than pronotum and widest at middle. Surface with shallowly sparse and fine punctures, shallowly 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 or weakly depressed at middle.

Legs. Profemora stout, with sparse punctures and yellow setae. Protibiae ( Fig. 17 : 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. 17 : C) narrower than apex of protibiae. Meso- and metafemora longer than profemora. Mesotibiae ( Fig. 17 : E) gradually widened toward apex, with rufous thick setae, inner side with dense yellow hairbrush from middle to apex. Mesotarsi ( Fig. 17 : F) narrower than apex of mesotibiae. Metatibiae ( Fig. 17 : 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 17 (6): 20 (5): 22 (6), that of corresponding tibiae 16 (7): 15 (5): 22 (5), and protarsi 25 (23): 28 (49): 28 (45): 17 (33): 38 (15), mesotarsi 24 (25): 30 (40): 27 (37): 19 (25): 46 (17), metatarsi ( Fig. 17 : H) 55 (17): 39 (19): 30 (18): 54 (16).

Aedeagus ( Figs 17 : I–J, 108–109) 2.9 mm long and 0.8 mm wide. Parameres 1.0 mm long and 0.7 mm wide, widest at base and nearly straight narrowing toward apex, lateral sides weakly emarginate posterior to apex in dorsal view, distal part rectangular-angled curved dorsally in lateral view.

Female ( Fig. 267 ). 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: ♂ 8.6–9.8 mm, ♀ 8.4–8.7 mm and width: ♂ 4.4–4.5 mm, ♀ 4.2–4.7 mm.

Type material. Holotype: ♂ ( MHBU), CHINA : Xizang: Jiali County, 22.VII.2013, Xing-Long Bai & Jun- Sheng Shan leg. Paratypes: 17♂♂, 11♀♀ ( MHBU), same data as holotype ; 8♂♂, 9♀♀ ( MHBU), Dorag Village , Jiali County, 30°52.164′ N, 92°33.539′ E, 4751 m, 15.VIII.2015, Guo-Dong Ren, Xing-Long Bai & Jun-Sheng Shan leg. ; 1♂, 1♀ ( MHBU), Xiama Township , Jiali County, 30°47.753′ N, 92°41.275′ E, 4580 m, 10.VIII.2019, Xing- Long Bai, Ya-Lin Li, Ming-Min Ma & He Shi leg. ; 4♂♂, 9♀♀ ( MHBU), Niangpu Township, Gongbujiangda Coun- ty, 30°17.287′ N, 93°04.071′ E, 4011 m, 8.VIII.2019, Xing-Long Bai, Ya-Lin Li, Ming-Min Ma & He Shi leg.

Distribution. China: Xizang.

Diagnosis. This new species is similar to Bioramix (Leipopleura) nyainrongensis Li & Egorov, 2016 , but can be distinguished from the latter by the following characters (based on male): (1) pronotal punctures sparser and finer (denser and coarser in B. nyainrongensis ); (2) elytral surface with traces of longitudinal carinae (without in B. nyainrongensis ); (3) parameres wider, distal part rectangular-angled curved dorsally (narrower, obtuse-angled in B. nyainrongensis ).

Etymology. This species name is derived from its distal part of parameres rectangular-angled curved dorsally.

Figures

FIGURES 17–18. Characters. 17. Bioramix rectiangulata (male), 18. B. riwoqeica (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 98–121. Parameres of male aedeagus in dorsal and lateral view. 98–101. Bioramix nagquana; 102–103. B. nigra; 104–105. B. nyainrongensis; 106–107. B. baqenensis (= B. politicollis); 108–109. B. rectiangulata; 110–121. B. reinigi (110– 111. QMD; 112–115. QMH; 116–117. QZL; 118–121. QDQ).

FIGURES 262–267. Habitus. 262. Bioramix nyainrongensis (male); 263. B. politicollis (male, syntype); 264–265. B. baqenensis (= B. politicollis, males; 264. holotype); 266–267. B. rectiangulata (266. male, holotype; 267. female, paratype).