Indoquedius aculeus, 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 : 31-33

7. Indoquedius aculeus sp. nov.

( Fig. 4 )

Type material: Holotype: CHINA: Sichuan: ɗ, Wolong, Wulidun, 2270 m, 7–10.VII.2004, collected by Xiao-Dong Yu (IZ-CAS). Paratypes: CHINA: Sichuan: 6&& Wolong, Wulidun, 2145–2270 m, VI– VII.2004, collected by Xiao-Dong Yu (IZ-CAS); Sichuan: &, Wolong, 1700 m, 23.VIII.2003, collected by Hong-Zhang Zhou (IZ-CAS).

Description. Head black; other body parts very dark reddish-brown, nearly black; elytra paler and more reddish-brown along lateral and posterior margins and along suture; abdomen slightly paler at posterior margin of each tergite; antennae, mouthparts and legs pale brown, middle portion of each sublobe of labrum and lateral margin of mandible dark brown, antennomeres VI–VIII darker than other antennomeres, IX–XI milky yellow.

BL = 10.5 mm. BW = 2.1 mm, HL/PL/EL = 1.00:1.26:1.50, HW/PW/EW/AW = 1.00:1.02:1.24:1.00.

Head round, wider than long, HW/HL = 1.23; eye very large and convex, nearly occupying the whole lateral side of head, in dorsal view HEL/HTL = 4.33; posterior frontal setiferous puncture situated before (anterior to) level of posterior margin of eye, two or three setiferous punctures between anterior and posterior frontal setiferous punctures along medial side of eye; basal setiferous puncture closer to nuchal constriction than to posterior frontal setiferous puncture; temporal setiferous puncture just on the posterior side of eye.

Pronotum wider than long, PW/PL = 1.17, nearly parallel-sided, posterior edge broadly round; two setiferous punctures in each dorsal row; one setiferous puncture and an additional smaller hairless puncture in each sublateral row; large lateral setiferous puncture behind level of last puncture in dorsal row, very close to and with socket touching lateral marginal groove; posterior ventral plate divided into two parts by middle longitudinal suture.

Scutellum densely punctuated but lacking any setae.

Elytra as wide as long, nearly parallel-sided, ESL/EL = 0.54, each elytron bearing one large antero-lateral seta, elytral surface evenly covered with dense setiferous punctures, without microsculpture.

Each abdominal tergite with setiferous punctures sparser in apical area than in basal area, surface also covered with dense transverse microsculpture, sternite III with middle portion of basal ridge sharply pointed backward, sternite IV with middle portion of basal ridge only slightly arcuated backward.

Male sternite VII ( Fig. 4 A) with four long setae on each side, apical margin with a shallow middle emargination, a small area around the emargination impunctate; tergite VIII ( Fig. 4 B) with one long setae on each side, apical edge broadly rounded; sternite VIII ( Fig. 4 C) with two long setae on each side, apical margin with a small middle emargination, a small area around the emargination impunctate; sternite IX ( Fig. 4 D) with basal portion small, apical margin with deep middle emargination; tergite X ( Fig. 4 E) with basal side broadly concaved, apical margin emarginated; aedeagus in lateral view ( Fig. 4 F) with apex of paramere not protruding beyond that of median lobe, apex of median lobe very sharp, in parameral view ( Fig. 4 G) with paramere from base to apex first narrowed and then split into two branches, apices blunt; median lobe from base to apex first narrowed and then widened at about basal half, apical portion constricted into small blunt apex; apical portion of paramere bearing two apical and two subapical setae on each branch, underside of paramere with about 10– 15 sensory peg setae distributed from apex to the insertions of subapical setae, outside of paramere bearing some small spines ( Fig. 4 H). Female tergite X ( Fig. 4 I) with apical side bluntly angled, basal side broadly round.

Distribution. China (Sichuan).

Remarks. The aedeagus of this species is similar to that of Indoquedius lasti and I. liuae , but its paramere bears some small spines on lateral sides which are absent in I. lasti . Compared with I. liuae , this species has a more divergent paramere and shorter apex of the median lobe.

Etymology. The species name is from the Latin word “ aculeus ” (spine) referring to the small spines on the paramere of the aedeagus.

Figures

FIGURE 4. Indoquedius aculeus 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 tergite X. Scales = 0.5 mm.