Gnaptorina (Gnaptorina) acutangula, 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 : 85-86

Gnaptorina (Gnaptorina) acutangula sp. nov.

( Figs. 1–7 , 16–17 )

Diagnosis. This new species is similar to Gnaptorina (Gnaptorina) potanini potanini Reitter, 1889 , but can be distinguished from the latter by the following characters: (1) anterior margin of pronotum deeply emarginate, anterior angles sharp, pronotal surface with median depression on disc (emarginate, widely obtuse, without median depression in G. potanini potanini ); (2) dorsal side of parameres nearly straight in lateral view (concave before base in G. potanini potanini ).

Description. Body black, weakly shining; antennae, palpi and tarsi pitchy brown.

Male ( Figs. 1–7 , 16 ). Anterior margin of frontoclypeus straight. Lateral margins of head with shallowly obtuse-angled incision above antennal base. Eyes slightly protruding beyond contour of head. Dorsal surface of head covered with large, well-defined punctures. Antennae ( Fig. 4 ) reaching pronotal base 1/4; length to width ratio of 2 nd– 11 th antennal segments 9(9): 18(9): 9(9): 9(9): 12(9): 12(9): 11(9): 8(9): 7(9): 9(9).

Pronotum ( Fig. 1 ) transverse, 1.4 times as wide as long, 1.8 times as wide as head, widest before middle; ratio of width at anterior margin to widest and basal 2.4: 3.6: 3.3. Lateral margins more sharply and arcuately narrowing toward anterior margin than posterior one, edged along entire length. Anterior margin deeply emarginate, posterior one straight, both edged laterally. Anterior angles nearly rectangular and sharp, posterior ones rectangular. Surface between lateral margins convex in cross-section, with dense and fine punctures on disc but larger at sides, median depression shallow and short. Prothoracic hypomera concave, with longitudinal wrinkles and granules. Prosternal process almost steeply sloping behind procoxae and forming small prominence at the end of declivity.

Elytra elongate-oval, widest before middle. 1.2 times as long as wide and 1.3 times as wide as pronotum. Surface between epipleura and sutural margins convex in cross-section, with shallowly fine punctures and irregular short wrinkles. Lateral carina visible dorsally in anterior 1/3. Surface of epipleura with fine rugulose. 1 st– 4 th ventrites with shallowly fine punctures and irregular short wrinkles.

Legs ( Figs. 2–3 ) moderately strong. Ratio of the length (width) of pro-, meso- and metafemora 2.0 (0.7): 2.0 (0.6): 2.8 (0.6), that of corresponding tibiae: 2.0 (0.4): 1.5(0.4): 2.5 (0.4). Protibiae narrow, slightly curved, outer margin shallowly emarginate at apex; with a massive upper spur at apical margin that longer than 1 st protarsomere, 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, distinctly widened in apical 1/3. Ventral surface of 1 st segment of mesotarsi with hairy brush, 2 nd segment with hairy tuft at apex. Ratio of the length (width) of metatarsomeres 1 st– 4 th as follows: 0.6(0.3): 0.4(0.2): 0.3(0.2): 0.7(0.2).

Aedeagus ( Figs. 5–7 ) 1.9 mm long and 0.5 mm wide. Parameres 0.5 mm long and 0.3 mm wide, basal wide and strongly narrowing toward apex in dorsal view, outer margins deeply and arcuately emarginate, dorsal side nearly straight in lateral view.

Female ( Fig. 17 ). Body wider and antennae shorter than male. Pronotum 0.8 times as wide as long, elytra 1.2 times as long as wide. Upper spur of protibiae massive and rounded apically. Ventral surface of pro- and mesotarsi without hairy brush or tuft.

Measurements. Body length: ♂ 9.1–9.2 mm, ♀ 9.2–9.3 mm; width: ♂ 4.9–5.0 mm, ♀ 5.0– 5.1 mm.

Type material. Holotype: ♂ ( MHBU), CHINA: Sichuan, Daocheng, Sumdo (Sangdui), 3900 m, 16– 17.VIII.2008, Yong Zhou leg. Paratypes: 3 ♂♂, 7♀♀ ( MHBU), same data as holotype ; 6 ♂♂, 12♀♀ ( MHBU), Sichuan, Daocheng, Sumdo ( Sangdui ), 3900 m, 16–17.VIII.2008, Zhen-Hua Gao & Yong Zhou leg. ; 1 ♂ ( MHBU), Sichuan, Daocheng , 3750 m, 18–19.VIII.2008, Yong Zhou leg. ; 1 ♂, 3♀♀ ( MHBU), Sichuan, Daocheng , 3700 m, 18–19.VIII.2008, Zhen-Hua Gao & Yong Zhou leg.

Distribution. China: Sichuan.

Etymology. The specific name is derived from the Latin word “ acut+angul ” meaning embellished, referring to the sharp anterior angles of pronotum.

Figures

FIGURES 1–7. Gnaptorina (Gnaptorina) acutangula sp. nov. (male). 1. head and pronotum; 2. fore leg; 3. hind leg; 4. antenna; 5–7. aedeagus in ventral, dorsal and lateral view. Scale bars 0.5 mm (5–7).

FIGURES 16–17. Habitus. 16–17. Gnaptorina (Gnaptorina) acutangula sp. nov. (16. male; 17. female).