Pseudohesperus luteus, 2011

Li, Liang & Zhou, Hong-Zhang, 2011, Revision and phylogenetic assessment of the rove beetle genus Pseudohesperus Hayashi, with broad reference to the subtribe Philonthina (Coleoptera: Staphylinidae: Staphylinini), Zoological Journal of the Linnean Society 163 (3), pp. 679-722 : 700-704

PSEUDOHESPERUS LUTEUS LI & ZHOU SP. NOV. ( FIG. 25A–I )

Type material: Holotype: China: Sichuan: ♂, Qingchengshan (30°54′N, 103°31′E), 22–24.viii.2005, Li Xiaoyan collected (IZ-CAS) ; Paratypes: 2 ♂♂, 15 ♀♀, same data as holotype, but 1 ♀, Chen Yongjie collected , 4 ♀♀, Zhang Yejun collected , 2 ♀♀, Zhao Caiyun collected (IZ-CAS); Sichuan : 2 ♀♀, Dujiangyan (30°54′N, 103°30′E), Puyang: Huaxi Village, 676 m asl, 12.xii.2009, Zhou Yulingzi collected (IZ-CAS) ; 1 ♂, 8 ♀♀, Emeishan (29°25′N, 103°20′E), 700–1800 m asl, 28–30.viii.2005, Li Xiaoyan collected (IZ-CAS) ; 2 ♂♂, 7 ♀♀, Baoxing (30°25′N, 102°49′E), 1.ix.2005, Li Xiaoyan collected (IZ-CAS) .

Description: Head and pronotum black, pronotum with strongly golden lustre. Antennae dark brown, sometimes with antennomeres X–XI or antennomeres IX–XI reddish-brown. Elytra black-brown with suture and posterior margin markedly reddish-brown. Scutellum black. Abdomen black with strongly iridescent lustre, posterior margin of each tergite narrowly reddish-brown. Mandibles, maxillary, and labial palpi and legs reddish-brown.

Body 7.02–8.00 mm long ( HPL: 2.20–2.61 mm). Head of rounded quadrangular shape, 0.89–1.06 mm long, 0.98–1.22 mm wide, slightly wider than long ( HW: HL = 1.00–1.18). Tempora 0.25–0.33 mm long, almost evenly rounded, densely and coarsely punctate; eyes large, slightly prominent, 0.41 mm long, 1.25–1.67 times as long as tempora. Dorsal surface of head with moderately numerous, large setiferous punctures, becoming sparser toward vertex, vertex largely impunctate. Entire head with distinct and profound microsculpture of transverse waves. Antennae long, antennomere I very long, slightly thickened towards apex, antennomere III much longer than antennomere II, following antennomeres gradually decreasing in length, but all distinctly longer than wide, antennomere XI obliquely truncated.

Pronotum slightly narrowed anteriad, 1.22– 1.31 mm long, 0.98–1.31 mm wide, almost as wide as head ( PW: HW = 0.93–1.15), sparsely and finely punctate, punctures separated by three to six times their diameter, narrowly impunctate along midline; disc with distinct and profound microsculpture of oblique line.

Elytra 1.47–1.80 mm long, 1.55–1.88 mm wide, along sides about 1.19–1.40 times as long as pronotum, densely and finely punctate, punctures separated by one to two times their diameter. Scutellum large, triangular, densely and finely punctuate.

Abdomen a little narrowed posteriad, widest 1.31– 1.63 mm, finely and densely punctate, punctures separated by one to two times their diameter at base, gradually becoming sparser toward apex; tergites III–V with two basal carinae, elevated area between basal carinae with irregular, a transverse row of punctures.

Male: Tergite VIII with arcuate apex. Sternite VIII with moderately wide, obtusely triangular medioapical emargination, partly filled by semimembranous extension ( Fig. 25F ). Genital segment with stylus of tergite IX simple, densely setose apically. Sternite IX with asymmetrical basal portion, apex deeply emarginate, each lobe without modified rod-like extensions ( Fig. 25E ). Tergite X triangular, widely emarginate at apex, with variable number of apical setae ( Fig. 25H ).

Aedeagus with median lobe distinctly exceeding paramere, narrowed into subacute apex ( Fig. 25A ); in lateral view, apical portion slightly bent dorsad (parameral side) ( Fig. 25B ); paramere distinctly narrower than median lobe, narrowed into obtusely rounded apex, face adjacent to median lobe with peg setae irregularly arranged along apical portion of paramere ( Fig. 25C, D ).

Female: Sternite VIII with arcuate apex, lacking medio-apical emargination. Genital segment with second gonocoxites moderately long, each with minute stylus bearing two long apical setae ( Fig. 25I ). Tergite X triangular, subtruncated at apex, with variable number of apical setae ( Fig. 25G ).

Etymology: The specific epithet is derived from the Latin word lut- (golden), and refers to the strongly golden reflex on the pronotum.

Distribution: At present known only from China (Sichuan).

Remarks: Pseudohesperus luteus Li & Zhou sp. nov. is closely related to P. pedatiformis Li & Zhou sp. nov. Pseudohesperus luteus Li & Zhou sp. nov. differs from P. pedatiformis Li & Zhou sp. nov. by pronotum with strongly golden reflex, elytra with suture, posterior margin markedly reddish-brown, and paramere entire (pronotum without golden reflex, elytra entirely black, and paramere trilobed in the latter one).

Figures

Figure 25. Pseudohesperus luteus sp. nov. A, aedeagus, dorsal (parameral side) view; B, median lobe of aedeagus, lateral view; C, D, underside of paramere; E, sternite IX of male; F, sternite VIII of male; G, tergite X of female; H, tergite X of male; I, gonocoxites of genital segment of female. Scale bars = 0.5 mm.