Geotragus brevidens, Ren, Li, Alonso-Zarazaga, Miguel A. & Zhang, Runzhi, 2013

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 : 167-170

Geotragus brevidens sp. nov.

( Fig. 3 , 4 )

Diagnosis. Similar to G. tuberculatus Chen , but differs by the following characters: scales sparsely distributed on dorsal surface, eyes in frontal view moderately flat (vs. strongly convex in G. tuberculatus ), epistome broad and the elytral interstria 3 only slightly elevated at base, without three consecutive tubercles.

Description. Holotype-male. Measurements (in mm): Standard length: 5.90; pronotal length: 1.65; pronotal width: 1.91; elytral length: 4.30; elytral width: 2.55; rostral length: 0.96; rostral width: 0.84.

Habitus and color ( Fig. 3 A, 3B): Integument reddish brown to dark red, antennae and legs reddish brown; with coppery metallic green to greyish brown scales, scales irregularly distributed, moderately sparse, tessellate, but not contiguous; scales on dorsal surface of rostrum sparse, round to oval, on lateral part of rostrum lanceolate; posterior half of antennal scrobes glabrous; pronotum with round scales; scales on ventrites dense, gradually narrowing from ventrite 1, so ventrite 5 with lanceolate scales; legs densely covered by scales; body with recumbent to subrecumbent sparse fine setae; rostrum covered with recumbent fine setae; setae of antennal scape and desmomeres 1–7 sparse, moderately long and fine; setae of interstriae fine, sparse and subrecumbent; setae on ventral surface fine and dense; setae of tibia long and straight, femora with subrecumbent fine setae.

Head ( Fig. 3 C): Moderately flat, dorsal surface smooth, punctures small and sparse; eyes moderately flat, with a shallow circumocular sulcus; frons rather convex, much higher than dorsal part of rostrum in lateral view.

Rostrum ( Fig. 3 C): In dorsal view, 1.14× length of wide, apex narrower than base; base narrower than frons; dorsal surface depressed in median area of rostrum; with a narrow and deep median sulcus, reaching vertex; epistome broad, posterior angle of epistome 90°, not forming a distinct carina; mandible scars elongate-oval; in dorsal view ventral margin of scrobes visible from apex to antennal insertion; in lateral view, lateral surface between eyes and antennal scrobes flat; lateral surface with a shallow sulcus near ventral margin of rostrum.

Antennae: Scape short, stout, not reaching middle of eyes at rest, 0.80× length of funicle; desmomere 1 elongate clavate, strongly widened towards apex, apex rather stout, 1.21× length of desmomere 2; desmomere 3 1.17× length of desmomere 4, elongate oval, 0.73× length of 2; desmomeres 4–6 equal in length, moniliform, shorter than desmomere 3; desmomere 7 1.33× length of and much wider than 6, moniliform; pubescence of funicle similar throughout; club segment 1 1.18× length of 2, segment 2 0.89× length of 3; segment 3 with a marked annulus beyond middle.

Pronotum: 0.86× as long as wide, transverse; anterior and posterior margin truncate; disc with a fine, shallow median longitudinal groove; posterior margin distinct carinate, linear; dorsal surface of pronotum with slightly sparse, large, round granules, space between granules convex, each granule with one recumbent fine seta on top; postocular vibrissae short.

Scutellum: Small but distinct, reddish brown, apex V-shaped.

Elytra: Base truncate; in lateral view moderately convex; in dorsal view, lateral margins roundly diverging from base to basal 1/4, then subparallel to 2/3 and strongly narrowed towards apex, apex nearly acute; odd interstriae slightly raised than even ones; interstria 1 moderately raised along basal 1/8, forming a longitudinal crest, strongly raised at declivity, forming a prominent longitudinal crest, top of crest sub-rectangular in lateral view; interstria 3 distinctly raised and expanded at base, much wider than remaining interstriae; interstria 5 gradually raised from base to declivity, most strongly raised at declivity, forming longitudinal crest; interstriae 3 and 9 coalescing, raised at declivity forming a V-shaped tubercle on each elytron.

Abdomen ( Fig. 4 A): Surface of ventrite 1 depressed at middle; suture I slightly bisinuate; surface of ventrite 2 moderately flat medially, without apical transverse impression; mesal length of ventrite 1 1.42× length of 2, ventrite 2 as long as ventrite 3 and 4 combined; ventrite 5 broadly parabolic, with flat surface.

Metendosternite ( Fig. 4 B): Stalk 0.33× length of furcal arms, trapezoidal and transverse, ventral margin 2× length of dorsal width of stalk, anterior part of longitudinal flange as long as posterior; hemiductus robust, wide and triangular, extending to sheath by a tunnel; anterior tendons positioned near apex of furcal arms, opposite to hemiductus; furcal arms robust, apically slightly bifurcate, diverging at nearly 45° in relation to longitudinal flange.

Legs: Protibiae bent inwards at apical 1/3; inner margin of protibiae moderately bisinuate, with ten moderately sharp and small teeth, each tooth with a spiniform seta just behind it, length of the longest denticle less than 1/10 width of tibia at the same point, outer margin slightly arcuate inwards; teeth of meso- and metatibiae fewer and larger than those of protibiae; protibial mucro small, distinct, covered by setae; tarsi short, broad; tarsomere 1 wider and 2× length of 2; tarsomere 5 long and stout.

Male genitalia and terminalia: Sternite VIII ( Fig. 4 C) divided into two hemisternites, transversely oriented, crescent shape, with discal part much wider than lateral; each hemisternite laterally acuminate, with anterior margin strongly sinuate, and posterior margin arcuate; membrane between sternite VIII and IX with two very small, elongate triangular sclerotizations. Sternite IX ( Fig. 4 C) with basal plate bilobed, each lobe sickle-shaped; spiculum gastrale almost as long as penis, slender, almost straight, anterior 1/3 slightly curved. Penis ( Fig. 4 D, 4E) in dorsal view with tube 2.58 mm in length, ca. 6.0× length of wide, temones 1.26 mm long; lateral margins subparallel, straightly converging towards apex, apex ogival; in lateral view moderately curved, more strongly so at apex; greatest width at base. Tegmen ( Fig. 4 F) 0.52× length of penis, with ring narrow, parameroid lobes developed with basal half more sclerotized area triangular; tegminal apodeme slightly stout, forming a Y-shape with basal piece, apex of apodeme rounded.

Variation. Male paratypes. Measurements (in mm): Standard length: 5.90–6.10; pronotal length: 1.65–1.72; pronotal width: 1.91–1.95; elytral length: 4.30–4.50; elytral width: 2.55–2.70; rostral length: 0.96–0.99; rostral width: 0.80–0.84.

Female paratype. Measurements (in mm): Standard length: 4.90–6.50; pronotal length: 1.45–1.85; pronotal width: 1.60–1.98; elytral length: 3.45–4.60; elytral width: 2.35–2.80; rostral length: 0.96–1.02; rostral width: 0.72–0.82. Elytra slightly wider than male, pronotum less transverse than male, ventrite 5 ( Fig. 4 G) parabolic, similar in length to ventrite 2. Sternite VIII ( Fig. 4 H) with spiculum ventrale thin, rod-like and almost straight, anteriorly slightly curved; lamina tightly folded, in lateral view triangular, ventral margin straight, strongly sclerotized. Ovipositor ( Fig. 4 H, 4I) with coxites shorter than sternite VIII, folded along middle, lateral margins strongly sclerotized; styli relatively small, cylindrical, with 2–3 long setae inserted apically, strongly sclerotized in comparison to coxites. Bursal sclerites ( Fig. 4 J) near the point of union of spermathecal duct and of oviduct, parallel, each sclerite in lateral view chevron-shaped, with mesal area strongly sclerotized, dorsal surface of mesal area with many small spines. Spermatheca ( Fig. 4 K) with corpus elongate, slightly shorter than cornu; cornu strongly curved, V-shaped, apically abruptly narrowed, apex narrowly rounded; nodulus prominent, oblong and curved toward ramus at apex, subcontiguous with and angled more than 90° in relation to ramus; ramus reduced.

Material examined. Holotype: 3: (white, printed): CHINA, Yunnan Prov. / Gongshan County, / Qiqi Reserve, 2000m; Sino-America Exped. / 2000.7.12 Liang H. B. [7.12 was deleted by collector] / N27°43’, E98°34’ / 7.9 [handwritten by collector]; (red, printed): HOLOTYPE; (white, printed): IOZ(E) 905049. Paratypes (23, 2Ƥ): 13: (white, printed): CHINA, Yunnan Prov. / Gongshan County, / No 12 Bridge-Yakou, / 2750–3680m; Sino- America Exped. / 2000.7.16 Liang H. B. / N27°43’, E98°28’; (yellow, printed): PARATYPE; (white, printed): IOZ(E) 905048. 2Ƥ: (white, printed): CHINA, Yunnan Prov. / Fugong, Lishadi Town, / Shibali Yakou & Burma / 27.20343°N, 98.69309°E; 3716m, 2005.8.17 day / Liang H.B., Zhang J.F. / California Academy & / IOZ., Chinese. Acad. Sci.; (yellow, printed): PARATYPE; (white, printed): IOZ(E) 1505821 and IOZ(E) 1505822. 13: (white, printed): CASENT / 3005827; CHINA, Yunnan Province, / Gaoligong Shan, Nujiang / Prefecture, Nujiang State / Nature Reserve, Dong Shao / Fang Area, 20 airkm W of / Gongshan, N27.69504° /; E98.48433°, 3300m, / 16–17 July 2000, / Stop#00–24, D.H. Kavanaugh, / C.E. Griswold, Liang H.-B., D. / Ubick, & Dong D.-Z. collectors; (yellow, printed): PARATYPE.

Holotype and all paratypes are to be conserved in IZCAS.

Distribution. China: Yunnan (Fugong, Gongshan). Altitudinal range of this species is from 2000–3716m.

Etymology. The specific epithet is referring to the small size teeth on inner margin of protibiae.

Figures

FIGURE 3. Habitus of Geotragus brevidens sp. nov., male, holotype: A dorsal view B lateral view C head, dorsal view. Scales: 1 mm.

FIGURE 4. Geotragus brevidens sp. nov.: A male ventrites, ventral view B male metendosternite, dorsal view C male sternite VIII and IX, dorsal view D penis, dorsal view E penis, lateral view F tegmen, dorsal view G female ventrites, ventral view 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.