Proscleropterus rudis Colonnelli, Qin & Huang

Mei Qin, Junhao Huang, Enzo Colonnelli, Runzhi Zhang & Hong Wu, 2016, Two new species and a key to species of the genus Proscleropterus Korotyaev (Coleoptera: Curculionidae) from China, Zoological Systematics 41 (2), pp. 173-185 : 180-185

Proscleropterus rudis Colonnelli, Qin & Huang , sp. nov.

( Figs 27–40 , 44 )

Type Specimens. Holotype. ♂ ( IZCAS), " China: Guizhou, Zunyi, Suiyang-xian, Kuankuoshui, Xiangguangshan-cun, 4-VI-2010, leg. Z. Wang, IOZ(E)1803073". Paratypes. 1♀, same data as holotype but "IOZ(E)1803619" ( IZCAS); Guizhou, Zunyi, Suiyang-xian, Kuankuoshui, Jinzi-cun, 1♀, 3-VI-2010, leg. Z. Wang, IOZ(E)1802495 ( IZCAS); Guizhou, Zunyi, Suiyang-xian, Kuankuoshui, Gongtong-gou, 1♀, 3-VI-2010, leg. Z. Wang, IOZ(E)1803089 ( IZCAS).

Description. Male (holotype). LB 2.36 mm; LR 1.03 mm; WP 0.87 mm; LP 0.77 mm; WE 1.44 mm; LE 1.54 mm. Habitus as shown in Figures 27–29 .

Vestiture. Ventrites ( Fig. 30 ) I and II clothed with short and apically pinnate white scales on disc, and with oval to lanceolate white scales mingled with sparse brown clavate scales on sides; ventrites III and IV with a row of sparse oval scales; ventrite V bearing dense hair-like brown scales on median concavity, and white oval and clavate scales on sides.

Head ( Figs 9–10 ). Rostrum slender, 1.38 times as long as pronotum, 4.78 times as long as wide at apex, evenly curved; subparallel-sided from base to antennal insertion, then moderately and gradually widened towards apex, where it is 1.15 times as wide as base. Antennae inserted at 0.44 length of rostrum from apex; scape moderate in length, evidently clavate, round and fringed with 2–3 short setae at apex; scape 1.15 times as long as the funicle, length ratio of funicular segments I: II: III: IV: V: VI = 2.48: 0.79: 0.73: 1.04: 1.00: 1.25 and width ratio = 1.37: 1.08: 1.00: 1.12: 1.37: 1.67.

Pronotum ( Figs 27, 29 ) 1.13 times as wide as long, 0.50 times as long and 0.61 times as wide as elytra. Pronotum with lateral sides subparallel on basal half, strongly convergent at the level of the median tubercles and then subparallel on apical 2/5.

Elytra ( Figs 27–29 ) oval, 1.07 times as long as wide, 2.00 times as long as and 1.65 times as wide as pronotum, with strongly prominent humeri, with large sharp granules at base of interval VIII; widest at basal fifth, then gradually convergent towards apex. Striae with punctures separated by a distance about 2–3 times longer than their diameter. Interval I with a row of sparse granules on apical 3/4; interval II with 2–3 sparse granules on basal fifth and with some weakly convex granules on middle; interval III with 3 weakly convex granules near base and two moderately large oblong or round tubercles composed of 3–4 merged granules basad and apicad of middle; interval IV narrow, without tubercles, only bearing a few sharp granules along its entire length; interval V with rather large short 5-capitate tubercle near base, another small tubercle composed of 3 merged granules and a convex granule basad and apicad of middle on one elytron, the other bearing only a small tubercle composed of 2 merged granules, and a round 7-capitate tubercle on apical fourth; interval VI with sculpture similar to that of IV; interval VII with a few large sharp granules scattered along its basal half, and a weak smooth elongate tubercle composed of 2–3 merged smaller granules apicad of middle; interval VIII with large tubercle at base, then a weak smooth elongate one composed of 2–3 merged smaller granules apicad of middle, rest of interval VIII with simple, irregular granules; interval IX with a tubercle composed of 4 merged granules on basal third, and a weak smooth elongate one composed of 2–4 merged smaller granules apicad of middle, rest of interval IX and lateral intervals with simple, irregular granules.

Underside. Ventrites ( Fig. 30 ) with coarse and moderately dense punctures; length ratio of ventrites I: II: III: IV: V = 5.03: 2.53: 1.04: 1.00: 2.67 and width ratio =1.88: 1.55: 1.25: 1.16: 1.00. Pygidium ( Fig. 31 ) moderately transverse, about 1.24 times as wide as long, coarsely and moderately punctured and with fine median carina.

Terminalia and genitalia. Penis ( Figs 32–33 ) broad, relatively thick in lateral profile; sides weakly widening from base to apical sixth, then strongly convergent apically; apical projection ( Fig. 34 ) blunt, rounded at apex. Endophallus ( Fig. 32 ) with a pair of plate-like sclerites in the apical part, numerous rounded spicules in the median part, and a pair of tubular structures at base. Sternite VIII broken during dissection; spiculum gastrale ( Fig. 36 ) robust, bent leftward, and far exceeding in length the aedeagal body or its apodeme. Tegmen ( Fig. 35 ) with apodeme slender, nearly as long as the diameter of the tegminal ring, weakly widened at apex.

Otherwise as in P. shennongjianus Qin & Huang , sp. nov.

Female (n =3). LB 2.46–2.74 mm (mean, 2.63 mm). LR 1.20–1.28 mm (mean, 1.25 mm). WP 0.87–0.91 mm (mean, 0.89 mm). LP 0.81–0.89 mm (mean, 0.84 mm). WE 1.56–1.68 mm (mean, 1.60 mm). LE 1.46–1.69 mm (mean, 1.59 mm).

Rostrum ( Figs 11–12 ) slightly slenderer than that of male, 1.45–1.57 times as long as pronotum, about 1.21 times as long as in males. Antennae inserted just basad of middle of rostrum.

Pronotum 0.98–1.11 times as wide as long.

Elytra 0.94–1.03 times as long as wide.

Tibiae simple, not mucronate.

Ventrites I and II moderately inflated, sparsely punctured. Ventrite V with shallow median concavity. Pygidium smaller than that of male, 1.22 times wider than long.

Terminalia and genitalia. Tergite VIII ( Fig. 37 ) with pair of combs of dense, long setae along apical margin. Sternite VIII ( Fig. 38 ) with a pair of patches of several minute setae near apex; arms slender and apically fuse, nearly 0.4 times as long as apodeme, nearly half as long as coxite and stylus combined. Coxites ( Fig. 39 ) robust, subdivided into two pieces, nearly 5.5 times as long as styli; styli apicolaterally inserted, moderate in length, nearly 2.2 times as long as wide. Spermatheca ( Fig. 40 ) C-shaped, collum slightly convex; ramus indistinct, outline almost uniformly continuous; cornu slender, strongly curved and attenuate.

Otherwise as in male.

Etymology. The species name is a Latin word “ rudis ” meaning “coarse”, to indicate its rougly sculptured elytra.

Distribution. China (Guizhou; Fig. 44 ).

Biological notes. Plant association unknown.

Remarks. The new species differs from P. shennongjianus Qin & Huang , sp. nov. in having plumper body, with wider pronotum subparallel-sided on apical 2/5, oval elytra with sides gradually convergent towards apex, whereas P. shennongjianus Qin & Huang , sp. nov. has more elongate body, pronotum subparallel-sided on apical half, subcordate elytra with sides evenly convergent towards apex. Moreover, the two species have different distribution of tubercles on elytral intervals.

Figures

Figures 44. Geographic distribution of Proscleropterus in China.

Figures 27 – 31. Proscleropterus rudis Colonnelli, Qin & Huang, sp. nov., male. 27, 29. Dorsal habitus. 28. Lateral habitus. 30. Ventrites. 31. Pygidium. Scale bars: 29 – 31 = 0.50 mm.

Figures 32 – 40. Proscleropterus rudis Colonnelli, Qin & Huang, sp. nov., male and female genitalia, from Guizhou, China. 32 – 36. Male. 32. Aedeagus, dorsal view. 33. Aedeagus, lateral view. 34. Apex of the aedeagal body, dorsal view. 35. Tegmen. 36. Sternites IX. 37 – 40. Female. 37. Tergite VIII. 38. Sternite VIII. 39. Coxite and stylus. 40. Spermatheca. Scale bars: 32 – 38 = 0.20 mm; 39 – 40 = 0.40 mm.

Figures 5 – 12. Proscleropterus spp., head. 5 – 8. P. shennongjianus Qin & Huang, sp. nov. 9 – 11. P. rudis Colonnelli, Qin & Huang, sp. nov. 5 – 6, 9 – 10. Male. 7 – 8, 11 – 12. Female. 5, 7, 9, 11. Dorsal view. 6, 8, 10, 12. Lateral view. Scale bars = 0.50 mm.