Indoquedius radius, 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 : 36-37

10. Indoquedius radius sp. nov.

( Fig. 7 )

Type material: Holotype: CHINA: Fujian: ɗ, Wuyishan Mountain, 6.VI.1973 (IZ-CAS).

Description. Head, pronotum and elytra nearly black; abdomen dark brown, iridescent; antennomeres I–II brown, III–VI darker apically, VIII–IX gradually becoming paler, X–XI milky yellow; labrum entirely brown, mandible reddish-brown, maxillary and labial palpi entirely brown; all legs entirely brown.

BL = 10.0 mm, BW = 2.0 mm, HL/PL/EL = 1.00:1.29:1.43, HW/PW/EW/AW = 1.00:1.06:1.24:1.00.

Head round, wider than long, HW/HL = 1.33; eye very large and convex, nearly occupying the whole lateral side of head, in dorsal view HEL/HTL = 10.00; posterior frontal setiferous puncture situated before level of posterior side of eye and with socket touching the eye; two setiferous punctures between anterior and posterior frontal setiferous punctures along medial side of eye; temporal setiferous puncture situated at the same level as posterior margin of eye; basal setiferous puncture closer to nuchal constriction than to posterior frontal setiferous puncture.

Pronotum slightly wider than long, PW/PL = 1.05, nearly parallel-sided, basal margin rounded; two setiferous punctures in each dorsal row; one setiferous puncture in each sublateral row; large lateral setiferous puncture slightly behind level of last puncture in dorsal row and with socket touching lateral marginal groove; posterior ventral plate bearing middle longitudinal carina and not divided into two parts.

Scutellum densely punctuated but lacking any setae.

Elytra wider than long, EW/EL = 1.07, ESL/EL = 0.51; each elytron with two large antero-lateral setae; surface covered with coarse and dense setiferous punctures becoming slightly sparser towards apex.

Setiferous punctures on each abdominal tergite sparser and smaller than those on elytron, becoming sparser towards apex of each tergite, surface among punctures covered with dense and rather vague transverse microsculpture which only becoming more obvious around punctures and near basal ridge; sternite III with middle portion of basal ridge sharply pointed backward.

Male sternite VII ( Fig. 7 A) with four large apical setae on each side, apical margin with a shallow middle emargination, a small area around the emargination impunctate; tergite VIII ( Fig. 7 B) with two large lateral setae on each side, middle portion of basal ridge arcuated backward; sternite VIII ( Fig. 7 C) with two large setae on each side, middle portion of basal ridge slightly arcuated backward, apical margin with a middle emargination, a small subtriangular area around emargination impunctate; sternite IX ( Fig. 7 D) with basal portion small, apical margin with a deep middle emargination, one large subapical seta on each side; tergite X ( Fig. 7 E) with basal side broadly concaved, apical margin with a deep middle emargination; aedeagus in lateral view ( Fig. 7 F) with apex of paramere not protruding beyond that of median lobe, paramere nearly straight throughout whole length, median lobe with apex slightly bent towards paramere, aedeagus in parameral view ( Fig. 7 G) with paramere from base to apex gradually narrowed and forming rod-shaped apical portion, apex blunt; median lobe from base to apex first nearly parallel-sided and then narrowed at about apical 1/10, apex blunt; paramere with base wider and other portion narrower than median lobe; apical portion of paramere with four small apical setae and two subapical setae on each side, sensory peg setae on underside distributed along apical and lateral sides, forming one apical group (including 7 peg setae) and two lateral groups (including 3–4 peg setae) ( Fig. 7 H). Female unknown.

Distribution. China (Fujian).

Remarks. This new species has an entire paramere with the distribution pattern of sensory peg setae being different from other congeners.

Etymology. The species name is derived from the Latin word “ radius ” (arm, beam, ray) referring to its straight paramere.

Figures

FIGURE 7. Indoquedius radius 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. Scales = 0.5 mm.