Pseudohesperus sparsipunctatus, 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 : 712-714

publication ID 10.1111/j.1096-3642.2011.00731.x

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scientific name

Pseudohesperus sparsipunctatus



Type material: Holotype: ♂, China: Zhejiang: Linan: Shunxi (30°12′N, 119°34′E), 400 m asl, 9.viii.2008, GoogleMaps

Zhou Yulingzi collected (IZ-CAS); Paratypes: 4 ♂♂, 6 ♀♀, same data as holotype (IZ-CAS) GoogleMaps .

Description: Head and pronotum black, shining. Antennae black-brown, with antennomeres I–III to various extent reddish-brown, antennomere XI or antennomeres X–XI sometimes reddish-brown. Elytra black with posterior margin markedly reddish-brown. Scutellum black. Abdomen black with strongly iridescent lustre. Mandibles, maxillary and labial palpi, and legs reddish-brown.

Body 8.98–9.80 mm long ( HPL: 2.69–2.94 mm). Head of rounded quadrangular shape, 0.98–1.22 mm long, 1.31–1.55 mm wide, distinctly wider than long ( HW: HL = 1.23–1.33). Tempora 0.25–0.33 mm long, almost evenly rounded, sparsely and coarsely punctate; eyes very large, moderately prominent, 0.49– 0.57 mm long, 1.75–2.33 times as long as tempora. Lateral portions of head with scattered, large setiferous punctuation; vertex largely impunctate. Entire head without microsculpture. Antennae long, antennomere I very long, thickened towards apex, antennomere III much longer than antennomere II, following antennomeres gradually decreasing in length, but all longer than wide, antennomere XI obliquely truncated.

Pronotum slightly narrowed anteriad, 1.47– 1.63 mm long, 1.47–1.71 mm wide, slightly wider than head ( PW: HW = 1.10–1.19); each side of broad impunctate midline with 12–15 scatter punctures, sometimes eight to ten punctures forming an irregular, dorsal row, disc without microsculpture.

Elytra 1.80–2.04 mm long, 2.04–2.37 mm wide, along sides 1.16–1.25 times as long as pronotum, densely and finely punctate, punctures separated by one to two times their diameter. Scutellum large, triangular, densely and finely punctate, and pubescent.

Abdomen a little narrowed behind, widest 1.80– 1.96 mm, densely and finely punctate, punctures separated by two to three times their diameter at base on tergites III–V and punctures separated by less than one puncture diameter at base on tergites VI–VII, punctation gradually becoming sparser toward apex of each tergite; tergites III–V with two basal carinae, elevated area between basal carinae densely and coarsely punctate.

Male: Tergite VIII with arcuate apex. Sternite VIII with moderately wide, obtusely triangular medioapical emargination, partly filled by semimembranous extension ( Fig. 28F View Figure 28 ). Genital segment with stylus of tergite IX simple, densely setose apically ( Fig. 28G View Figure 28 ). Sternite IX with asymmetrical basal portion, apex deeply emarginate, each lobe prolong, forming modified rod-like extensions ( Fig. 28H View Figure 28 ). Tergite X triangular, inconspicuously emarginate at apex, with variable number of apical setae ( Fig. 28I View Figure 28 ).

Aedeagus with median lobe distinctly exceeding paramere, narrowed into obtusely rounded apex ( Fig. 28A View Figure 28 ); in lateral view, apical portion of median lobe slightly dilated ( Fig. 28B View Figure 28 ); paramere widened at subapical portion, narrowed into obtusely pointed apex, face adjacent to median lobe with peg setae irregularly arranged along apical portion of paramere ( Fig. 28C, D View Figure 28 ).

Female: Sternite VIII with arcuate apex, lacking medioapical emargination. Genital segment with second gonocoxites moderately long, each with minute stylus bearing two long apical setae. Tergite X subtruncated at apex ( Fig. 28E View Figure 28 ).

Etymology: The specific epithet is derived from a combination of the Latin words spars- (sparse) and punct- (puncture), and refers to the sparse punctation on the pronotum.

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

Remarks: Pseudohesperus sparsipunctatus Li & Zhou sp. nov. is closely related to P. cf. eustilbus ( Kraatz, 1859) . Pseudohesperus sparsipunctatus Li & Zhou sp. nov. differs from P. eustilbus by distinctly sparser punctures on pronotum, much wider paramere, and larger number of peg setae on underside of paramere.


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