Platyscelis (Platyscelis) acutipenis, Bai & Ren, 2019

Bai, Xing-Long & Ren, Guo-Dong, 2019, Revision of the genus Platyscelis Latreille, 1818 from China (Coleoptera: Tenebrionidae: Platyscelidini), Zootaxa 4609 (1), pp. 101-126 : 103-106

Platyscelis (Platyscelis) acutipenis sp. nov.

( Figs. 1 , 5–6 , 37 , 39–40 )

Diagnosis. This new species is similar to Platyscelis (Platyscelis) freyi Kaszab, 1940 , but can be distinguished from the latter by the following characters: (1) elytral surface with short thick setae (long in P. freyi ); (2) metatibiae curved, wide and flat (straight and narrow in P. freyi ); (3) parameres narrowing towards apex straightly, outer margins with long and sharp hooks at apex, apex curved to dorsal side in lateral view (arcuately, extremely weak, not curved in P. freyi ).

Description. Body black, weakly shining.

Male ( Figs. 1 , 5–6 , 37 , 39 ). Anterior margin of frontoclypeus straight, surface with dense and moderately coarse punctures. Frons and genae weakly convex, with punctures dense and coarse. Eyes transverse, anterior margin shallowly emarginate. Antennae ( Fig. 1 : B) nearly reaching base of pronotum, 2nd to 8th antennomeres cylindrical and thicker at apex, 9th to 10th almost spherical, and 11th sharped-oval. Length (width) ratio of 2nd to 11th antennal segments 25 (19): 67 (21): 37 (22): 36 (20): 38 (20): 35 (21): 36 (26): 31 (27): 31 (27): 39 (27).

Pronotum ( Fig. 1 : A) transverse and convex, widest at base, 1.6 times as wide as long, 2.2 times as wide as head. Lateral margins arcuately narrowing toward apex. Ratio of width at anterior margin to basal 26: 50. Anterior margin nearly straight and posterior one sinuate. Anterior angles obtuse and posterior ones rectangular. Lateral margins edged in anterior margin and posterior one not edged, entire lateral margins edged, widely depressed from base to middle. Punctures fine and dense on disc but extremely dense and coarse, and merged partially at sides. Prothoracic hypomera with dense wrinkles, granule and sparse yellow setae. Prosternum before procoxae with yellow setae, prosternal process projecting beyond level of procoxae, sharp at apex in lateral view. Mesoventrite with punctures and yellow setae.

Elytra oval and weak convex, base moderately wider than pronotum and widest at middle, 1.1 times as long as wide and 1.2 times as wide as pronotum. Surface with short thick setae, traces of longitudinal carinae and sparse yellow soft setae, without punctures. Lateral carina nearly visible completely in dorsal view and almost reaching sutural angle.

Abdomen with short sparse yellow setae, not depressed at middle of 1st and 2nd ventrites.

Profemora with sparse punctures and yellow setae. Protibiae ( Fig. 1 : D) gradually widened towards apex and curved at inner side, underside concave at apex and apical margin foliate extended, inner side with dense yellow hairbrush at apex. Protarsi ( Fig. 1 : C) moderately widened but narrower than apex of protibiae. Meso- and metafemora longer than profemora. Mesotibiae ( Fig. 1 : E) gradually widened toward apex, with rufous strong setae. Mesotarsi ( Fig. 1 : F) weakly widened and narrower than apex of mesotibiae. Metatibiae ( Fig. 1 : G) curved, wide and flat, with rufous strong setae. Length (width) ratio of pro-, meso- and metafemora 26 (9): 28 (8): 34 (10), that of corresponding tibiae 25 (8): 26 (6): 37 (6), and protarsi 26 (27): 32 (49): 26 (42): 20 (24): 70 (24), mesotarsi 51 (30): 41 (38): 31 (30): 27 (24): 74 (22), metatarsi ( Fig. 1 : H) 115 (30): 54 (29): 42 (26): 86 (27).

Aedeagus ( Figs. 1 : I–K, 5–6) 3.4 mm long and 1.0 mm wide. Parameres 0.9 mm long and 0.6 mm wide, widest at base and narrowing toward apex straightly, outer margins with long and sharp hooks at apex, apex curved to dorsal side in lateral view.

Female ( Fig. 40 ). Body wider, antennae not reaching base of pronotum, pro- and mesotarsi not widened, other characters similar to male.

Measurements. Body length: ♂ 11.1–11.5 mm, ♀ 11.3–11.8 mm and width: ♂ 6.0– 6.3 mm, ♀ 6.7–6.8 mm.

Type material. Holotype: ♂ ( MHBU), CHINA: Ningxia: Fengtai Forest Farm, Longde , 13–14.VII.2009, Xin-Pu Wang & Xiao-Lin Zhao leg . Paratypes: 1♂, 1♀ ( MHBU), same data as holotype; 1♂, 1♀ ( MHBU), Fengtai Forest Farm, Longde , 30.VI.2008, Xin-Pu Wang & Xiao-Li Liu leg. ; Gansu: 1♂ ( MHBU), Dingxi , VIII.1983, coll. NWAFU .

Distribution. China: Gansu, Ningxia.

Etymology. This species is named derived from sharp hooks present at apex of parameres.

Figures

FIGURES 1–2. (A–K). Male characters. 1. Platyscelis acutipenis; 2. P. amdoensis; A. pronotum; B. antenna; C. protarsi; D. protibiae; E. mesotibiae; F. mesotarsi; G. metatibiae; H. metatarsi; I–K. aedeagus in dorsal, lateral and ventral view. Measuring scale = 0.5 mm.

FIGURES 5–20. Parameres of male aedeagus in dorsal and lateral view. 5–6. Platyscelis acutipenis; 7–8. P. amdoensis; 9–10. P. angusticollis angusticollis; 11–12. P. angusticollis platytarsis; 13–14. P. bogatshevi; 15–16. P. brevis; 17–18. P. confusa;

FIGURES 37–38. Thick setae on elytral surface (under 5x of Canon MP-E 65 mm). 37. Platyscelis acutipenis; 38. P. freyi.

FIGURES 39–44. Habitus. 39–40. Platyscelis acutipenis (39. male, holotype; 40. female, paratype); 41. P. amdoensis (male); 42–43. P. angusticollis angusticollis (males; 42. lectotype); 44. P. angusticollis platytarsis (male, lectotype).