Pachynotus pilosus, Ren & Ren & Zhang, 2024

Ren, Jinliang, Ren, Li & Zhang, Runzhi, 2024, Revision of the Chinese Pachynotus Kollar & L. Redtenbacher, 1844 (Coleoptera, Curculionidae), with descriptions of two new species, ZooKeys 1197, pp. 153-169 : 153

Pachynotus pilosus sp. nov.

Figs 1 , 2 , 3A, B , 4A, C, E , 5

Material examined.

Holotype, ♂: (white, printed): 西藏山南曲松 [ Xīzàng Shānnán Qǔsōng] 邱多江乡亚堆扎拉山垭口 [Qiūduōjīangxīang Yàduīzhālāshān yàkǒu] / 28.8307°N, 92.0507°E / 中科院动物所 [ Zhōngkēyuàn Dòngwùsuǒ] / 4989.19 m / 2021.VII.12 / 任金梁 [ Rén Jīnliáng]: IOZ(E)1965015 // Paratypes (2♂, 3♀): same data as holotype except IOZ(E)1965016-IOZ(E)1965020 .

Description.

Holotype, male. Measurements (in mm): standard length: 5.10; pronotal length: 1.70; pronotal width: 1.9; elytral length: 3.10; elytral width: 2.08; rostral length: 0.90; rostral width: 0.60.

Habitus and colour (Fig. 1A, B ): body elongate-oval, small; integument dark reddish brown; antennae and legs reddish brown, with pale yellowish-brown scales; scales on dorsal and lateral surfaces of rostrum moderately dense, oval to elongate-oval; antennal scape and funicles without scales; pronotum with polygonal scales, moderately dense, not contiguous; scales on elytra polygonal, dense, not contiguous; scales on ventrites moderately dense, polygonal, elongate-oval; scales on legs dense; dorsal of tarsi surface without scales; body with erect to suberect and slightly longer setae; rostrum sparsely covered with suberect fine setae; antennal scape and desmomeres I-VII with long, fine, sparse setae; dorsal and lateral surfaces of pronotum with sparse, suberect setae; setae on interstriae long, erect to suberect, behind declivity slightly longer, erect, equal to 6 × diameter of one scale; setae on ventral surface moderately long, fine, erect.

Head (Fig. 1C ): moderately convex; dorsal surface smooth; punctures small, moderately dense; eyes flat, oval; forehead weakly convex, moderately elevated than base of rostrum in lateral view.

Rostrum (Fig. 1C ): in dorsal view 1.50 × as long as wide, apex narrower than base; sides narrowed from base to middle, and then slightly broadened to apex; dorsal surface with a narrow and shallow median sulcus, reaching fore margin of forehead; epistome broad U-shaped, smooth, posterior angle of epistome>90°; mandibular scars oval; ventral margin of antennal scrobes visible at apical half in dorsal view; in lateral view, without triangular depression positioned laterally between eyes and antennal scrobes; prementum with two setae.

Antennae (Fig. 1E ): scape slender, clavate, reaching posterior margin of eyes at rest, 0.99 × length of funicle; desmomere I 1.40 × length of II, both segments elongate clavate; desmomere III short, clavate, 0.59 × length of II; desmomere IV 0.91 × length of III, nearly equal width; desmomeres IV-VI moniliform, equal in length and width; desmomere VII moniliform, 1.21 × length, 1.24 × width of VI; club elongate-oval, apical sharp, three-segmented, uniformly pubescent, segment I 1.25 × length of II; segment II shorter than segment III.

Pronotum: 0.89 × as long as wide; subquadrate in dorsal outline, strongly convex; sides strongly rounded, greatest width after midpoint, gradually narrowing towards both ends, fore margin shorter than posterior one; median sulcus fine, extremely shallow; dorsal surface smooth, punctures small, each puncture covered by a scale; postocular lobes absent, vibrissae fine, dense, yellow.

Scutellum: large and distinct, triangular, shiny, uncoated, reddish brown.

Elytra: 1.49 × as long as wide, moderately convex, elongate-oval; base not raised as prominent flange, not bisinuate; sides subparallel before declivity, only slightly narrowed near the base; striae distinct, narrow, moderately deep, linear; punctures minute, spot like, moderately dense, space between punctures narrower than the diameter of punctures; interstriae wide, slightly flat, without tubercles, odd interstriae slightly raised than even ones.

Abdomen (Fig. 2A ): sternite I depressed in middle, slightly convex at sides; suture between sternites I and II slightly curved forward in middle; sternite II slightly convex; sternite I longer than II, sternite II slightly shorter than III and IV combined; sternites III and IV equal in length; sternite V moderately convex, apex round, longer than sternites III and IV combined.

Legs: rather short; femora clavate; fore tibiae subcylindrical, slightly sinuate, slightly bent inwards at apical quarter, apex not projected inwards and outwards, with long and slender hairs, obviously different from other setae, somewhat sparse (Fig. 1D ); inner margin of fore tibiae with several extremely small teeth; median and hind tibiae without teeth; corbels of hind tibiae closed.

Genitalia: sternite VIII (Fig. 2B ) divided into two hemisternites, transversely oriented, subtrapeziform; each laterally acuminate. Sternite IX (Fig. 2B ) with basal plate bilobed; spiculum gastrale 1.19 × as long as aedeagus, strongly sclerotised, anterior third curved. Penis (Fig. 2C, D ) in dorsal view with tube 0.97 mm in length, 4.8 × length of wide, temones 0.62 mm long; in lateral view curved, more strongly so near base and at apex, greatest width at midpoint. Tegmen (Fig. 2E ) 0.61 × length of penis, with ring narrow, parameroid lobes developed with basal half more sclerotised; tegminal apodeme slender, forming a Y-shape with basal piece.

Variation.

Male paratypes. Measurements (in mm): standard length: 5.00-5.30; pronotal length: 1.7-1.9; pronotal width: 1.85-2.10; elytral length: 3.00-3.20; elytral width: 2.00-2.20; rostral length: 0.80-1.00; rostral width: 0.60-0.70.

Females. Measurements (in mm): standard length: 4.80-5.50; pronotal length: 1.70-1.80; pronotal width: 1.80-2.10; elytral length: 3.10-3.50; elytral width: 2.08-2.60; rostral length: 0.80-1.00; rostral width: 0.60-0.75. Fore tibiae with short and slender setae, same as other setae (Fig. 4C ); ventrite V (Fig. 5A ) parabolic, longer than ventrite II. Sternite VIII (Fig. 5C ) with spiculum ventrale thin, rod-like and sinuate. Spermatheca (Fig. 5D ) with corpus subquadrate; cornu widely curved, U-shaped, apically gradually narrowed; ramus subspherical, prominent and long.

Etymology.

Pilosus, Latin adjective, meaning “hairy”, in reference to the significantly longer hair on the male fore tibiae than on other parts.

Distribution.

China (Xizang).

Figures

Figure 1. Habitus of Pachynotus pilosus sp. nov., holotype A dorsal view B lateral view C head and rostrum, dorsal view D left protibia, dorsal view E antenna, dorsal view. Scale bars: 1 mm (A, B, D); 0.5 mm (C, E).

Figure 2. Abdominal and genital structures of Pachynotus pilosus sp. nov., holotype A ventrites, ventral view B sternites VIII and IX, dorsal view C aedeagus, lateral view D aedeagus, dorsal view E tegmen, dorsal view. Scale bars: 0.5 mm.

Figure 3. Habitus of Pachynotus pilosus sp. nov. paratype A dorsal view B lateral view. Pachynotus arcuatus sp. nov. holotype C dorsal view D lateral view. Scale bars: 1 mm.

Figure 4. Pachynotus pilosus sp. nov. A head and rostrum, dorsal view C right protibia, anterior view E antenna, anterior view; Pachynotus arcuatus sp. nov. B head and rostrum, dorsal view D right protibia, anterior view F antenna, anterior view. Scale bars: 0.5 mm (A, B, E, F); 1 mm (C, D).

Figure 5. Abdominal and genital structures of Pachynotus pilosus sp. nov. A ventrites, ventral view B sternite VIII and female genitalia, lateral view C sternum VIII, dorsal view D spermatheca, lateral view. Scale bars: 0.5 mm.