Gnaptorina (Gnaptorina) artipenis, Bai & Li & Ren, 2020

Bai, Xing-Long, Li, Xiu-Min & Ren, Guo-Dong, 2020, Description of a new subgenus and four new species of Gnaptorina Reitter, 1887 (Coleoptera: Tenebrionidae: Blaptini) from China, Zootaxa 4809 (1), pp. 165-176 : 169-170

Gnaptorina (Gnaptorina) artipenis sp. n.

( Figs 3 , 9–10 )

Type material. Holotype: ♂ ( MHBU) ( Fig. 9 ), labeled “ 2015-VIII-2 / RnjÊȒHĤOi9 [Jinhe Township, Yanyuan County, Sichuan] / ĒÑḦ ŮẊAE ÜṬ± [Guo-Dong Ren, Xing-Long Bai & Jun-Sheng Shan leg.] / Oi ËXỶṘṄẘ [Museum of Hebei University]” // “ 27°42.913′ N / 101°56.760′ E / Alt. 1337 m / OiËXỶṘṄẘ [ Museum of Hebei University ]” . Paratypes: 50♂ 47♀ ( MHBU), same data as holotype ; 14♂ 8♀ ( MHBU), labeled “ 2008-VII-18 / RnjDƂHƂḋ9 [ Badi Township , Danba County, Sichuan] / 2230m / ĒÑḦḢ [Guo-Dong Ren et al. leg.] / OiËXỶṘṄẘ [Museum of Hebei University]”. Types have the additional label “ HOLOTYPE (and PARATYPE, respectively) / Gnaptorina artipenis sp. n. / Det. Bai Xinglong, 2018” .

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

Male ( Figs 3 A–J, 9). Head ( Fig. 3A ). Anterior margin of epistome emarginate. Lateral margins of head with shallow obtuse-angled incision above antennal base. Genal margins parallel before eyes. Eyes transverse, not protruding beyond contour of head. Dorsal surface of head weakly convex, with dense and fine punctures. Antennae ( Fig. 3B ) reaching pronotal base; antennomeres 4–7 long and cylindrical, 8–10 spherical, 11 oval; length (width) ratio of antennomeres 2–11 25(22): 63(23): 30(23): 29(24): 30(23): 33(27): 28(36): 29(36): 30(38): 46(37).

Prothorax. Pronotum ( Fig. 3C ) transverse, 1.2 times as wide as long, 1.6 times as wide as head. Lateral sides widest before middle, ratio of width at anterior margin to widest part and base 23: 37: 35. Anterior margin weakly emarginate, laterally beaded; lateral margins more arcuately narrowing to anterior margin than to base, sometimes weakly emarginate before posterior angles, finely beaded along entire length; posterior margin straight, laterally beaded. Anterior angles obtuse, posterior ones weakly obtuse or rectangular. Disc convex, surface with moderately dense and fine punctures, sparse at disc. Prothoracic hypomera weakly concave, smooth, with longitudinal wrinkles and sparse and tiny granules. Prosternal process steeply sloping behind procoxae and forming wide and flat prominence at end of declivity.

Pterothorax. Elytra elongate oval and convex, 1.4 times as long as wide, 1.3 times as wide as pronotum, widest at middle. Surface with very sparse and fine punctures and irregular short wrinkles. Lateral margins reaching sutural elytral angle, visible dorsally in anterior third and apex. Surface of epipleura smooth, with shallow wrinkles and sparse and tiny granules.

Abdomen. Ventrites with sparse and short yellow setae, 1 and 2 flat in middle, 1–3 with longitudinal wrinkles, apex of 3 and 4–5 with punctures.

Legs ( Fig. 3 D–H) strong. Protibiae straight, upper apical spur nearly as long as protarsomere 1, lower apical spur extremely short; ventral surface of protarsomeres 1 and 2 with hairy brush. Mesotibiae weakly curved; ventral surface of mesotarsomere 1 with hairy brush at apex. Metatibiae straight. Ratio of length (width) of pro-, meso- and metatibiae 28(4): 30(5): 39(6), that of metatarsomeres 1–4 8(3): 6(3): 5(2): 7(3).

Aedeagus ( Fig. 3 I–J) 2.1 mm long and 0.6 mm wide. Parameres 0.7 mm long and 0.4 mm wide, widest at base and strongly arcuate narrowing from basal 1/4 to apex laterally in dorsal view; dorsal side straight, weakly curved to ventral side apically in lateral view.

Female ( Fig. 10 ). Body wider than male. Antennae not reaching pronotal base, antennomeres 4–7 short and cylindrical. Abdominal ventrites 1 and 2 slightly convex in middle. Upper apical spur of protibiae wide and flat, nearly as long as protarsomeres 1–3 combined. Ventral surface of pro- and mesotarsi without hairy brush. Inner apical spur of metatibiae strongly widened at apex.

Measurements. Body length: ♂ 11.1–11.3 mm, ♀ 11.4–12.5 mm; width: ♂ 5.1–5.4 mm, ♀ 6.0– 6.2 mm.

Etymology. This species is named from the Latin adjective “ artus, -a, um ” (= narrow) and noun “ penis ”, in reference to its narrowed male parameres.

Distribution. China: Sichuan.

Diagnosis. This new species is morphologically similar to G. australis Medvedev, 2008 , but can be distinguished from the latter by the following male character states: (1) pronotal punctures sparser; (2) elytral punctures very sparse (dense in G. australis ); (3) lateral sides of parameres strongly arcuate, from basal 1/4 to apex more narrow in dorsal view (more wide in G. australis , Fig. 38 in Medvedev, 2008).

Figures

FIGURE 3. Characters. Gnaptorina (Gnaptorina) artipenis sp. n. (male). A. head; B. antenna; C. pronotum; D. apex of profemur; E. protibia; F. protarsus; G. mesotarsus; H. metatibia; I–J. aedeagus in dorsal and lateral view. Scale bars: 0.5 mm.

FIGURES 6–14. Habitus. 6. Gnaptorina longicornis (male); 7–8. G. polita (7. male, holotype; 8. female, paratype); 9–10. G. artipenis (9. male, holotype; 10. female, paratype); 11–12. G. crenata (11. male, holotype; 12. female, paratype); 13–14. G. ampliptera (13. male, holotype; 14. female, paratype).