Indoquedius bicornutus, Zhao, Zony-Yi & Zhou, Hong-Zhang, 2010

Zhao, Zony-Yi & Zhou, Hong-Zhang, 2010, Taxonomy of the genus Indoquedius Blackwelder (Coleoptera: Staphylinidae: Staphylininae) of China with description of four new species, Zootaxa 2619, pp. 27-38 : 33-34

8. Indoquedius bicornutus sp. nov.

( Fig. 5 )

Type material: Holotype: CHINA: Sichuan: ɗ, Jiulong County, 2665 m, 9–12.VII.2001, collected by Xiao- Dong Yu (IZ-CAS). Paratypes: CHINA: Sichuan: 3ɗɗ, same data as holotype (IZ-CAS); Yunnan: ɗ, Dali County, Cangshan, 2085–2200 m, 30.VII.2006, collected by Xiao-Yan Li (IZ-CAS).

Description. Head black; pronotum very dark reddish-brown, posterior margin slightly paler; scutellum with similar color as pronotum; elytra dark reddish-brown, paler than pronotum, more pale along posterior margin; each abdominal tergite dark reddish-brown, with posterior margin paler; antennae nearly entirely yellowish-brown, apical 3 or 4 antennomeres sometimes slightly darker, labrum yellowish-brown, mandibles dark reddish-brown with lateral and medial margins darker, maxillary and labial palpi yellowish-brown; all legs with femora dark reddish-brown with apical portion paler, tibiae and tarsi yellowish-brown.

BL = 9.5 mm, BW = 1.8 mm, HL/PL/EL = 1.00:1.38:1.50, HW/PW/EW/AW = 1.00:1.16:1.26:1.14.

Head round, wider than long, HW/HL = 1.24; eye very large, nearly occupying the whole lateral side of head, in dorsal view HEL/HTL = 7.14; posterior frontal setiferous puncture situated in front of level of posterior margin of eye; two setiferous punctures along medial margin of eye between anterior and posterior frontal setiferous punctures; temporal setiferous puncture at the same level of posterior margin of eye; basal setiferous puncture closer to nuchal constriction than to posterior frontal setiferous puncture; infraorbital ridge with two small angled projections near posterior end.

Pronotum wider than long, PW/PL = 1.11, slightly narrowed forward, basal margin broadly rounded; marginal groove only disappearing in small anterior median portion; two setiferous punctures in each dorsal row, one setiferous puncture in each sublateral row, large lateral setiferous puncture very close to but with socket not touching marginal groove, situated behind level of last puncture in dorsal row; posterior ventral plate bearing middle longitudinal carina and not divided into two parts.

Scutellum densely punctuate but lacking any setae.

Elytra wider than long, EW/EL = 1.11, ESL/EL = 0.56, slightly narrowed forward, each elytron with two large antero-lateral setae, surface evenly covered with dense and coarse setiferous punctures.

Each abdominal tergite covered with dense setiferous punctures becoming denser near base of tergite, sternite III with middle portion of basal ridge sharply pointed backward and forming of longitudinal keel.

Male sternite VII ( Fig. 5 A) with three long setae on each side, apical margin with a very wide and shallow middle emargination, a small area around the emargination impunctate; tergite VIII ( Fig. 5 B) with one long seta on each side, apical margin broadly rounded, basal ridge with middle portion slightly arcuated backward; sternite VIII ( Fig. 5 C) with two long setae on each side, apical margin with a shallow middle emargination, a small area around the emargination impuncate; sternite IX ( Fig. 5 D) with basal portion small, apical margin with a deep emargination, with one long seta on each side; tergite X ( Fig. 5 E) with a deep emargination on apical margin; aedeagus in lateral view ( Fig. 5 F) with apex of paramere not protruding beyond that of median lobe, paramere nearly straight throughout whole length with apical portion narrowed to fit the shape of apex of median lobe; median lobe with apical portion bent towards paramere; aedeagus in parameral view ( Fig. 5 G) with paramere apex gradually narrowed toward blunt apex, median lobe much wider than paramere in apical half, apex widely blunt, apical portion of paramere with four small apical setae, two similar subapical setae on each side, sensory peg setae on underside of paramere forming one apical group (including 3 peg setae) very close to apical margin and one subapical group (including 7 peg setae) below insertions of subapical setae ( Fig. 5 H). Female tergite X ( Fig. 5 I) with a narrow middle emargination on apical margin.

Distribution. China (Sichuan,Yunnan).

Remarks. Unlike any other congeners, Indoquedius bicornutus has two small but obvious projections on the posterior portion of infraorbital ridge on head. Also it has unique distribution of the sensory peg setae on the paramere.

Etymology. The specific epithet is derived from a combination of Latin words bi- (double) and cornutus (horned). It refers to two small angled projections on the infraorbital ridge that is characteristic to this new species.

Figures

FIGURE 5. Indoquedius bicornutus sp. nov.: A, male sternite VII; B, male tergite VIII; C, male sternite VIII; D, male sternite IX; E, male tergite X; F, aedeagus in lateral view; G, aedeagus in parameral view; H, underside of paramere; I, female sternite IX. Scales = 0.5 mm.