Bioramix (Leipopleura) laxipenis, 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 : 34-35

Bioramix (Leipopleura) laxipenis sp. nov.

( Figs 12 , 88–89 , 249–250 )

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

Male ( Figs 12 , 88–89 , 249 ). 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. 12 : 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 20 (16): 29 (16): 24 (16): 23 (15): 23 (16): 24 (16): 28 (18): 22 (19): 22 (20): 28 (19).

Prothorax. Pronotum ( Fig. 12 : B) transverse and convex, 1.5 times as wide as long and 2.0 times as wide as head. Lateral sides widest at base, arcuately narrowing toward apex. Ratio of width at anterior margin to basal 25: 39. Anterior margin weakly emarginate, posterior one straight. Anterior and posterior angles weakly obtuse. Anteri- or and posterior margins edged laterally, entire lateral margins edged. Dorsal surface with sparse and fine punctures on disc, denser and finer at sides. Lateral sides narrowly depressed along lateral margins. 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 nearly as wide as pronotum and widest at middle. Surface with shallowly sparse and fine punctures, shallowly fine wrinkles. Lateral margins of elytra merging with outer margins of epipleura anterior to apex of elytra and reaching sutural angle, visible anterior 1/ 3 in dorsal view.

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

Legs. Profemora stout, with sparse punctures and yellow setae. Protibiae ( Fig. 12 : 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. 12 : C) narrower than apex of protibiae. Meso- and metafemora longer than profemora. Mesotibiae ( Fig. 12 : E) gradually widened toward apex, with yellow setae and rufous thick setae. Mesotarsi ( Fig. 12 : F) narrower than apex of mesotibiae. Metatibiae ( Fig. 12 : G) weakly curved, with yellow setae and rufous thick setae. Length (width) ratio of pro-, meso- and metafemora 17 (7): 20 (6): 23 (6), that of corresponding tibiae 15 (8): 14 (4): 25 (6), and protarsi 17 (20): 32 (51): 27 (51): 17 (37): 51 (20), mesotarsi 25 (30): 37 (46): 25 (41): 24 (26): 46 (21), metatarsi ( Fig. 12 : H) 69 (22): 37 (22): 32 (22): 63 (22).

Aedeagus ( Figs 12 : I–J, 88–89) 2.5 mm long and 0.8 mm wide. Parameres 0.8 mm long and 0.6 mm wide, widest at base and narrowing toward apex, lateral sides weakly emarginate posterior to apex in dorsal view, distal part curved dorsally in lateral view.

Female ( Fig. 250 ). 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: ♂ 8.0– 8.4 mm, ♀ 8.2 mm and width: ♂ 4.0– 4.2 mm, ♀ 4.2 mm.

Type material. Holotype: ♂ ( MHBU), CHINA : Qinghai: Zadoi County, 4250 m, 3.VIII.2001, Wen-Zhu Li leg. , coll. IZCAS. Paratypes: 1♀ ( MHBU), same data as holotype ; 1♂ ( MHBU), Zaqên Township , [Zadoi County], 7–8.VII.2014, Zhi-Jun Zhou leg. ; 6♂♂, 9♀♀ ( MHBU), Gesangxiaozhen , Zadoi County, 32°51.721′ N, 95°23.026′ E, 4043 m, 25.VII.2019, Guo-Dong Ren, Xing-Long Bai, Ya-Lin Li, Ming-Min Ma & He Shi leg. ; 9♂♂, 7♀♀ ( MHBU), Sulu Township , Zadoi County, 32°32.553′ N, 95°18.744′ E, 4216 m, 26.VII.2019, Guo-Dong Ren, Xing- Long Bai, Ya-Lin Li, Ming-Min Ma & He Shi leg. ; 7♂♂, 1♀ ( MHBU), Xinyun Village, Sulu Township , Zadoi County, 32°26.731′ N, 95°24.489′ E, 4163 m, 26.VII.2019, Guo-Dong Ren, Xing-Long Bai, Ya-Lin Li, Ming-Min Ma & He Shi leg. ; 26♂♂, 12♀♀ ( MHBU), Longna Shan , Qumarlêb County, 34°12.541′ N, 95°47.261′ E, 4493 m, 24.VII.2019, Guo-Dong Ren, Xing-Long Bai, Ya-Lin Li, Ming-Min Ma & He Shi leg.

Distribution. China: Qinghai.

Diagnosis. This new species is similar to Bioramix (Leipopleura) miranda sp. nov., but can be distinguished from the latter by the following characters (based on male): (1) pronotal surface shining and more strongly convex (weakly shining and more weakly in B. miranda ); (2) elytral surface with metallic sheen (without in B. miranda ); (3) protarsi narrower than apex of protibiae (as wide as in B. miranda ); (4) antennae and tarsi brown (black in B. miranda ); (5) base of parameres slightly wider than apex (much in B. miranda ).

Etymology. This species name is derived from its widened parameres.

Figures

FIGURES 11–12. Characters. 11. Bioramix latitarsis (male), 12. B. laxipenis (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 74–97. Parameres of male aedeagus in dorsal and lateral view. 74–75. Bioramix homoplasta; 76–77. B. hongyuanensis; 78–79. B. igori; 80–81. B. impressithorax; 82–83. B. integra; 84–85. B. kochi; 86–87. B. latitarsis; 88–89. B. laxipenis; 90–91. B. lhozhagensis; 92–93. B. longipilis; 94–95. B. micans; 96–97. B. miranda.

FIGURES 244–249. Habitus. 244. Platyscelis obovatus (= Bioramix integra, female, holotype); 245–246. Bioramix kochi (males; 245. lectotype); 247–248. B. latitarsis (247. male, holotype; 248. female, paratype); 249. B. laxipenis (male, holotype).

FIGURES 250–255. Habitus. 250. Bioramix laxipenis (female, paratype); 251. B. lhozhagensis (male, holotype); 252–253. B. longipilis (252. male, holotype; 253. female, paratype); 254–255. B. micans (males; 254. lectotype).