Bioramix (Leipopleura) impressithorax, 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 : 29-30

Bioramix (Leipopleura) impressithorax sp. nov.

( Figs 10 , 80–81 , 240–241 )

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

Male ( Figs 10 , 80–81 , 240 ). 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. 10 : A) reaching pronotal base, antennomeres II–VIII short cylindrical and thicker at apex, IX–X nearly spherical, XI sharped-oval. Length (width)ratio of antennomeresII–XI 29 (17): 32(16):26 (16): 24 (16): 22(16):25 (17): 28 (22): 26(23):24 (23): 35 (25).

Prothorax. Pronotum ( Fig. 10 : B) transverse and strongly convex, 1.5 times as wide as long and 2.0 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 26: 44: 42. Anterior margin emarginate, posterior one straight. Anterior and posterior angles obtuse. Anterior and posterior margins edged laterally, entire lateral margins edged. Dorsal surface with sparse and fine punctures on disc, dense and coarse at sides. Lateral sides widely flattened. 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, 1.1 times as long as wide and 1.1 times as wide as pronotum, base slightly wider than pronotum and widest at middle. Surface smooth, with shallowly sparse, fine punctures and fine wrinkles. Lateral margins of elytra not reaching sutural angle, interrupted anterior to apex of elytra, visible anterior 1/ 3 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. 10 : 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. 10 : C) narrower than apex of protibiae. Meso- and metafemora longer than profemora. Mesotibiae ( Fig. 10 : E) gradually widened toward apex, with rufous thick setae, inner side with dense yellow hairbrush from middle to apex. Mesotarsi ( Fig. 10 : F) narrower than apex of mesotibiae. Metatibiae ( Fig. 10 : G) straight, with rufous thick setae, inner side with dense yellow hairbrush from middle to apex. Length (width) ratio of pro-, meso- and metafemora 19 (8): 23 (7): 26 (7), that of corresponding tibiae 19 (8): 19 (5): 27 (6), and protarsi 26 (27): 34 (54): 32 (53): 20 (39): 53 (18), mesotarsi 32 (27): 30 (45): 30 (39): 22 (26): 59 (18), metatarsi ( Fig. 10 : H) 67 (22): 40 (21): 31 (19): 54 (19).

Aedeagus ( Figs 10 : I–J, 80–81) 2.7 mm long and 0.7 mm wide. Parameres 1.0 mm long and 0.5 mm wide, widest at base and narrowing toward apex, base strongly wider than apex, distal part curved dorsally in lateral view.

Female ( Fig. 241 ). Body wider, antennae not reaching pronotal base, abdominal ventrites 1–2 neither depressed nor flattened at middle, pro- and mesotarsi not widened, other characters similar to male.

Measurements. Body length: ♂ 7.7–9.4 mm, ♀ 7.9–8.8 mm and width: ♂ 4.2–4.9 mm, ♀ 4.4–4.7 mm.

Type material. Holotype: ♂ ( MHBU), CHINA : Qinghai: Gyobrag Township , Nangqên County, 1.VII.2014, Zhi-Jun Zhou leg. Paratypes: 1♂, 5♀♀ ( MHBU), same data as holotype ; 4♂♂, 4♀♀ ( MHBU), Nangqên County, 4000 m, 5.VII.2008 , Guo-Dong Ren et al. leg .; 3♂♂ ( MHBU), Nangqên County, 27–29.VII.2014, Zhi-Jun Zhou leg. ; 1♂ ( MHBU), Zadoi County, 20.VII.1963, Xiang-Chu Yin leg. , coll. NWIPB; 21♂♂, 18♀♀ ( MHBU), Zadoi County, 4400 m, 4.VII.2008 , Guo-Dong Ren et al. leg .; 1♂, 5♀♀ ( MHBU), Sai Qu , Zadoi County, 32°50.783′ N, 95°28.634′ E, 4045 m, 22.VII.2012 , Guo-Dong Ren et al. leg .; 1♂ ( MHBU), Sahuteng Town , Zadoi County, 32°53.641′ N, 95°19.062′ E, 4292 m, 22.VII.2012 , Guo-Dong Ren et al. leg .; 1♀ ( MHBU), Namsai Township, Za- doi County , 3–5.VII.2014, Zhi-Jun Zhou leg. ; 1♀ ( MHBU), Qumarlêb County, 8.IX.1966, Zhang leg. , coll. IZCAS; 1♂, 2♀♀ ( MHBU), Yushu County, 4350 m, 4.VII.2008 , Guo-Dong Ren et al. leg .; 1♂, 1♀ ( MHBU), Shanglaxiu Township , Yushu County, 32°57.479′ N, 96°06.856′ E, 4227 m, 21.VII.2012 , Guo-Dong Ren et al. leg .; 1♂, 1♀ ( MHBU), Chenwen Town , Chindu County, 33.3416° N, 97.1782° E, 3996 m, 17.VII.2009 , Guo-Dong Ren et al. leg .; 1♀ ( MHBU), Chenwen Town , Chindu County, 33.3416° N, 97.1782° E, 3996 m, 17.VII.2009, Guo-Dong Ren, Yi-Bin Ba & Yong Zhou leg.

Distribution. China: Qinghai.

Diagnosis. This new species is similar to Bioramix (Leipopleura) reinigi ( Kaszab, 1940) , but can be distinguished from the latter by the following characters (based on male): (1) pronotum and elytra strongly convex (more weakly in B. reinigi ); (2) lateral sides of pronotum widely flattened, posterior angles widely obtuse (narrowly depressed, rectangular or weakly obtuse in B. reinigi ).

Etymology. This species name is derived from its widely flattened lateral sides of pronotum.

Figures

FIGURES 9–10. Characters. 9. Bioramix homoplasta (male), 10. B. impressithorax (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 238–243. Habitus. 238–239. Bioramix igori (males; 238. holotype); 240–241. B. impressithorax (240. male, holotype; 241. female, paratype); 242–243. B. integra (males; 242. lectotype).