Gnaptorina (Gnaptorina) crassitibia, Li & Bai & Ren, 2019

Li, Xiu-Min, Bai, Xing-Long & Ren, Guo-Dong, 2019, Two new species of the genus Gnaptorina Reitter from the Hengduan Mountains, China (Coleoptera: Tenebrionidae: Blaptini), Zootaxa 4695 (1), pp. 83-89 : 86-87

Gnaptorina (Gnaptorina) crassitibia sp. nov.

( Figs. 8–15 , 18–19 )

Diagnosis. This new species is similar to Gnaptorina (Gnaptorina) miroshnikovi Medvedev, 1998 but can be distinguished from the latter by the following characters: (1) pronotum widest at middle, anterior angles nearly rectangular (before middle, obtuse and widely round at apex in G. miroshnikovi ); (2) ventral surface of 1 st and 2 nd segments of mesotarsi of male with hairy brush (hairy tuft in G. miroshnikovi ); (3) lateral margins of parameres slightly emarginate before base in dorsal view (straight at base and strongly emarginate in G. miroshnikovi ).

Description. Body black, weakly shining.

Male ( Figs. 8–15 , 18 ). Anterior margin of frontoclypeus weakly emarginate. Lateral margins of head with shallowly obtuse-angled incision above antennal base. Genal margins parallel before eyes. Eyes slightly protruding beyond contour of head. Surface of head slightly convex, with dense and fine punctures. Antennae ( Fig. 15 ) reaching pronotal base 1/4; length to width ratio of 2 nd– 11 th antennal segments 9(9): 23(9): 15(9): 15(9): 13(9): 15(9): 11(9): 11(11): 8(9): 11(11).

Pronotum ( Fig. 9 ) transverse, 1.4 times as wide as long, 1.7 times as wide as head, widest at middle; ratio of width at anterior margin to widest and basal 0.6: 1.0: 0.9. Lateral margins distinctly and arcuately narrowing toward anterior margin in anterior 1/3; basal 2/3 narrowing to base nearly straight, edged along entire length. Anterior margin deeply emarginate, posterior one straight, both edged laterally. Anterior angles nearly rectangular, posterior ones rectangular. Punctures fine on disc, as large as those on head laterally. Prothoracic hypomera with fine longitudinal rugosity. Prosternal process steeply sloping behind procoxae and forming small prominence at the end of declivity.

Elytra elongate-oval, widest before middle, 1.3 times as long as wide and 1.3 times as wide as pronotum. Surface between epipleura and sutural margins convex in cross-section, with irregular fine wrinkles and fine punctures. Lateral carina visible anterior 1/3 and apically in dorsal view. Epipleural surface smooth, with sparse and fine wrinkles. Abdominal ventrites with punctures and brown setae.

Legs ( Figs. 10, 14 ) moderately strong. Ratio of the length (width) of pro-, meso- and metafemora 2.5(0.9): 2.1(0.7): 3.0(0.8); that of corresponding tibiae: 2.0(0.4): 2.3(0.4): 2.9(0.5). Upper spur of protibiae parallel-sided and rounded at apex; lower spur absent. Ventral surface of 1 st– 3 rd segments of protarsi with hairy brush, 4 th segment with hairy tuft at apex. Meso- and metatibiae slightly and arcuately curved, gradually widening towards apex. Ventral surface of 1 st– 2 nd segments of mesotarsi with hairy brush. Ratio of the length (width) of metatarsomeres 1 st– 4 th 0.7(0.3): 0.4(0.3): 0.4(0.2): 0.8(0.2).

Aedeagus ( Figs. 11–13 ) 2.0 mm long and 0.6 mm wide. Parameres 0.6 mm long and 0.3 mm wide, lateral margins of parameres slightly emarginate before base in dorsal view and regularly narrowing towards apex.

Female ( Fig. 19 ). Body wider and antennae shorter than male. Pronotum 0.7 times as wide as long, elytra 1.2 times as long as wide. Lateral carina of elytral visible anterior 2/3 dorsally. Upper spur of protibiae massive. Ventral surface of pro- and mesotarsi without hairy brush or tuft.

Measurements. Body length: ♂ 9.3–9.4 mm, ♀ 9.4-9.5 mm; width: ♂ 4.6 mm, ♀ 4.8 mm.

Type material. Holotype: ♂ ( MHBU), CHINA: Sichuan, Baiyü (Baiyu), Ronggai , 31º07.621ʹ N, 98º55.026ʹ E, 3120 m, 5.VIII.2016, Xiu-Min Li, Xing-Long Bai, Run-Yang Zhang & Xian-Lei Shao leg. Paratypes: 3 ♂♂, 1♀ ( MHBU), same data as holotype .

Distribution. China: Sichuan.

Etymology. The specific name is derived from the Latin word “ crass+tibia ” meaning embellished, referring to the strong protibiae.

Figures

FIGURES 8–15. Gnaptorina (Gnaptorina) crassitibia sp. nov. (male). 8. head; 9. pronotum; 10. fore leg; 11–13. aedeagus in dorsal, lateral and ventral view; 14. hind leg; 15. antenna. Scale bars 0.5 mm (11–13).

FIGURES 18–19. Habitus. 18–19. Gnaptorina (Gnaptorina) crassitibia sp. nov. (18. male; 19. female).