Geotragus tuberculatus Chen, 1990

Ren, Li, Alonso-Zarazaga, Miguel A. & Zhang, Runzhi, 2013, Revision of the Chinese Geotragus Schoenherr with description of three new species (Coleoptera: Curculionidae: Entiminae), Zootaxa 3619 (2), pp. 161-182 : 164-167

Geotragus tuberculatus Chen, 1990

( Fig. 1 , 2 )

Geotragus tuberculatus Chen, 1990 . Sinozoologia, 7: 149–150, fig.1.

Diagnosis. Elytra with interstria 3 with a row of three prominent tubercles before declivity; interstria 6 raised and forming a row of 3–4 rounded tubercles before declivity.

Redescription. Holotype-male. Measurements (in mm): Standard length: 5.80; pronotal length: 1.70; pronotal width: 1.75; elytral length: 4.15; elytral width: 2.50; rostral length: 1.05; rostral width: 0.70.

Habitus and color ( Fig. 1 A, 1B): Body slender; color dark brown, antennae and legs reddish brown; with coppery metallic pearl white, pale brown to dark brown scales, scales moderately dense, tessellate, contiguous but not overlapping; scales on dorsal and lateral surfaces of rostrum moderately dense, elongate oval; scales behind epistome round and small, clearly different from others; posterior half of antennal scrobes glabrous; pronotum with polygonal scales, moderately dense, contiguous, some scales imbricate, with a longitudinal stripe of lighter scales on each side of dorsum; scales on elytra polygonal, dense, but not contiguous; scales on ventrites moderately dense, round to elongate-oval; scales on legs dense; with short, curved, recumbent to subrecumbent setae, sparsely distributed; rostrum covered with recumbent thick setae; setae of antennal scape and desmomeres 1–7 long, fine and sparse; disc and lateral surface of pronotum with sparse, recumbent setae; setae of interstriae lanceolate, curved, sparse and subrecumbent; setae on ventral surface moderately thick, long, recumbent and dense; setae of tibiae long and moderately dense, femora with recumbent lanceolate setae.

Head ( Fig. 1 C): Moderately convex, dorsal surface corrugated, with many longitudinal fine and shallow sulci, and small and dense punctures; eyes strongly convex, with a deep and fine circumocular sulcus; frons slightly depressed, not elevated regarding to dorsal surface of rostrum in lateral view.

Rostrum ( Fig. 1 C): In dorsal view, 1.50× length of wide, apex narrower than base; base slightly narrower than frons; dorsal surface flat in median area of rostrum, punctured, with a narrow and deep median sulcus, extending longitudinally from antennal insertion to the vertex; posterior angle of epistome between 45° and 90°, with carina distinct and blunt; mandible scars round to rectangular; in dorsal view ventral margin of scrobes visible from apex to middle of rostrum; in lateral view, with a shallow triangular depression positioned laterally between eyes and antennal scrobes, close to ventral margin of rostrum, accompanied by subparallel deep sulcus.

Antennae: Scape slender, reaching middle of eyes at rest, 0.93× length of funicle; desmomere 1 1.32× length of 2, both segments elongate clavate; desmomere 3 short, clavate, 0.74× length of 2; desmomeres 4–6 moniliform, 4 0.93× length of 3, 5 0.93× length of 4; desmomeres 5 and 6 equal in length; desmomere 7 1.33× length of and wider than 6, elongate moniliform; pubescence of funicle similar throughout; club segment 1 1.13× length of 2, segment 2 0.73× length of segment 3; segment 3 with a marked annulus beyond middle.

Pronotum: 0.97× as long as wide, subquadrate; anterior margin truncate, posterior margin mesally slightly produced; disc with a fine, shallow, incomplete median longitudinal groove, slightly flattened on both sides of median groove; posterior margin not carinate; dorsal surface of pronotum with dense, large, and round granules, each granule with one recumbent lanceolate seta on top; postocular vibrissae blond, long.

Scutellum: Small , reddish brown, apex broadly V-shaped.

Elytra: Base slightly emarginated; in lateral view moderately convex; in dorsal view, lateral margins clearly diverging from base to basal 1/4, then subparallel and slightly curved, reaching its greatest width at mid length, thence clearly converging towards the apex, apex widely rounded; interstriae tuberculate; interstria 1 moderately raised along basal 1/8, forming a longitudinal crest, raised at declivity forming a prominent longitudinal crest, apically rounded in lateral view; interstriae 3 distinctly raised and forming three consecutive conical tubercles before declivity; interstria 4 raised and forming a row of 2–3 small round tubercles before declivity; interstria 5 raised behind basal 1/8 and forming a row of 2–3 elongate tubercles before declivity, and a strongly protruding conical tubercle at declivity; interstria 6 raised and forming a row of 3–4 rounded tubercles before declivity; interstria 7 raised and forming 2–3 small elongate tubercles before declivity; interstriae 3 and 9 apically coalescent, raised at declivity forming a triangular tubercle.

Abdomen ( Fig. 2 A): Surface of ventrite 1 depressed at middle, slightly convex at sides; suture I strongly bisinuate; surface of ventrite 2 moderately convex, without apical transverse impression; mesal length of ventrite 1 1.28× length of 2, 2 1.09× length of 3 and 4 combined; ventrite 5 parabolic, with convex surface.

Metendosternite ( Fig. 2 B): Stalk 0.36× length of furcal arms, trapezoidal and transverse, anterior part of longitudinal flange slightly shorter than posterior; hemiductus wide, truncate, positioned at apical half of furcal arms but near the midpoint; anterior tendons weak, positioned almost in the middle of furcal arms, opposite to hemiductus; furcal arms thin, apically clearly bifurcate, diverging at nearly 60° in relation to longitudinal flange.

Legs: Protibiae sinuate, bent inwards at apical 1/4; inner margin of protibiae with eight sharp and large teeth, each tooth with a spiniform seta just behind it; teeth of meso- and metatibiae sparse and much smaller than those of the protibiae; protibial mucro moderately large, distinct, not covered by setae; tarsi long and broad; tarsomere 1 almost 2× length of tarsomere 2.

Male genitalia and terminalia: Sternite VIII ( Fig. 2 C) divided into two hemisternites, transversely oriented, subtriangular; each hemisternite laterally acuminate, anterior margin widely roundly emarginate, posterior margin strongly angulate; membrane between sternite VIII and IX with two very small, dot-like sclerotizations. Sternite IX ( Fig. 2 C) with basal plate bilobed, each lobe semi-trapezoidal; spiculum gastrale 0.77× length of penis, apodeme slender, almost straight, slightly curved anteriorly. Penis ( Fig. 2 D, 2E) in dorsal view with tube 2.63 mm in length, ca. 6.9× length of wide, temones 0.88 mm long; lateral margins subparallel at middle, diverging at ostium level, thereafter roundly converging, apex ogival; in lateral view curved, more strongly so near base and at apex, greatest width at midpoint. Tegmen ( Fig. 2 F) 0.38× length of penis, with ring narrow, parameroid lobes developed with basal half more sclerotized; tegminal apodeme slender, forming a Y-shape with basal piece; apex of apodeme slightly expanded to form a round plate.

Variation. Male paratypes. Measurements (in mm): Standard length: 5.60–6.10; pronotal length: 1.55–1.75; pronotal width: 1.65–1.95; elytral length: 4.05–4.20; elytral width: 1.60–2.60; rostral length: 1.05–1.13; rostral width: 0.70–0.80.

Female paratype. Measurements (in mm): Standard length: 6.80; pronotal length: 1.75; pronotal width: 2.05; elytral length: 5.30; elytral width: 3.50; rostral length: 1.05; rostral width: 0.88. Elytra 1.35–2.19× length of male, pronotum 0.85× length of male, ventrite 5 ( Fig. 2 G) parabolic, longer than ventrite 2. Sternite VIII ( Fig. 2 H) with spiculum ventrale thin, rod-like and sinuate; lamina tightly folded, in lateral view triangular, ventral margin angulated close to speculum ventral, strongly sclerotized. Ovipositor ( Fig. 2 H, 2I) with coxites similar in length to sternite VIII, folded along middle, lateral margins strongly sclerotized, posteriorly slightly narrowed; styli relatively small, cylindrical, apically inserted two long setae. Bursal sclerites ( Fig. 2 J) near the point of union of spermathecal duct and of oviduct, facing each other at middle, each sclerite in lateral view chevron-shaped, with both arms curved, dorsal surface of mesal area with several spines. Spermatheca ( Fig. 2 K) with corpus subquadrate; cornu elongate, widely curved, U-shaped, apically gradually narrowed, apex narrowly rounded; nodulus prominent, subcontiguous with and angled almost 90° in relation to ramus; ramus trapezoid, prominent and moderately long.

Material examined. Types: 13: (white): [Yúnnán, printed], [Lúshuǐ, handwritten] / [Yáojiāpíng, handwritten], 2800m [handwritten] / [ Zhōngguó Kēxuéyuàn, printed]; (white): 1981. VI.6 [handwritten] / [Cǎijízhĕ, Wáng Shūyǒng, printed]; (red, printed): HOLOTYPE; (white, printed): IOZ(E) 905001. 1Ƥ: same data as holotype except ALLOTYPE printed on sea-green paper and IOZ(E) 905002. 13: same data as holotype except PARATYPE printed on yellow paper and IOZ(E) 905005. 13: with same locality as holotype except 2500m, collecting date 1981. V.24, PARATYPE printed on yellow paper and IOZ(E) 905004. 13: (white): [Yúnnán, printed], [Lúshuǐ, handwritten] / [Piànmǎ, handwritten], 2300m [handwritten] / [ Zhōngguó Kēxuéyuàn, printed]; (white): 1981. V.31 [handwritten] /

[Cǎijízhĕ, Wáng Shūyǒng, printed]; (yellow, printed): PARATYPE; (white, printed): IOZ(E) 905003. Other materials: 13: CHINA, Yunnan Prov. / Fugong, Maji Town / Majimi, plant beating / 27.40301°N, 98.82446°E; 1505m, 2005.8.26 day / Liang H.B, Zhang J.F. / Califormia Academy & / IOZ., Chinese. Acad. Sci. / IOZ(E) 1798751.

Holotype and all paratypes conserved in IZCAS.

Distribution. China: Yunnan (Fugong, Lushui). Altitudinal range of this species is from 1505–2800m. Fugong is a new locality record.

Figures

FIGURE 1. Habitus of Geotragus tuberculatus Chen, male, paratype: A dorsal view B lateral view C head, dorsal view. Scales: 1 mm.

FIGURE 2. Geotragus tuberculatus Chen: A male ventrites, ventral view B male metendosternite, dorsal view C male sternites VIII and IX, dorsal view D penis, dorsal view E penis, lateral view F tegmen, dorsal view G female ventrites, ventral view (g = groove) H sternite VIII and female genitalia, lateral view I coxites and styli, dorsal view J bursal sclerites, lateral view K spermatheca, lateral view. Scales: 0.5 mm.