Pseudohesperus tripartitus, Li & Zhou, Li & Zhou, 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 : 714-715

publication ID 10.1111/j.1096-3642.2011.00731.x


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scientific name

Pseudohesperus tripartitus



Type material: Holotype: ♂, China: Sichuan: Wolong: Wulitun   (31°28′N, 103°36′E), 2220 m asl, 6–, Yu Xiaodong collected (IZ-CAS); paratypes: 2 ♂♂, 1 ♀, same data as holotype, but 2220–2410 m asl, (IZ-CAS). GoogleMaps  

Description: Head and pronotum black, shining. Antennae dark brown, with antennomere XI or antennomeres X–XI reddish-brown. Elytra reddish-brown. Scutellum dark brown. Abdomen black, with strongly iridescent lustre. Mandibles, maxillary and labial palpi, and legs reddish-brown.

Body 9.55–10.0 mm long ( HPL: 2.86–2.94 mm). Head of rounded quadrangular shape, 1.22–1.39 mm long, 1.14–1.31 mm wide, slightly narrower than long ( HW: HL = 0.93–1.00). Tempora 0.41–0.49 mm long, almost evenly rounded, sparsely and coarsely punctate; eyes small, slightly prominent, 0.33–0.41 mm long, 0.80–0.83 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, 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– 1.55 mm long, 1.31–1.47 mm wide, slightly wider than head ( PW: HW = 1.06–1.20), sparsely and finely punctate, punctures separated by three to five times their diameter, narrowly impunctate along midline, disc with distinct and profound microsculpture of oblique lines.

Elytra 1.80–2.04 mm long, 1.96–2.04 mm wide, along sides 1.16–1.33 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 posteriad, widest 1.63– 1.88 mm, densely and finely punctate, punctures separated by two to three times their diameter at base, gradually becoming sparser toward apex; tergites III–V with two basal carinae, elevated area between basal carinae almost impunctate.

Male: Sternite VIII with moderately wide, obtusely triangular medioapical emargination, partly filled by semimembranous extension ( Fig. 29E View Figure 29 ). Genital segment with stylus of tergite IX simple, densely setose apically. Sternite IX with asymmetrical basal portion, apex deeply emarginate, without modified rod-like extensions ( Fig. 29D View Figure 29 ). Tergite X triangular with medioapical emargination ( Fig. 29F View Figure 29 ).

Aedeagus similar to that of P. pedatiformis Li & Zhou   sp. nov.; median lobe slightly exceeding paramere, narrowed into subacute apex ( Fig. 29A View Figure 29 ); in lateral view, apical portion slightly bent dorsad (parameral side) ( Fig. 29B View Figure 29 ); paramere trilobed apically, middle lobe distinctly longer and wider than lateral lobes, face adjacent to median lobe with peg setae arranged along apical portion of paramere ( Fig. 29C View Figure 29 ).

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 ( Fig. 29H View Figure 29 ). Tergite X triangular, subtruncated at apex, with two long apical setae ( Fig. 29G View Figure 29 ).

Etymology: The specific epithet is derived from the Latin word tripartit- (tripart), and refers to the trilobed paramere of the aedeagus.

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

Remarks: Pseudohesperus tripartitus Li & Zhou   sp. nov. is closely related to P. pedatiformis Li & Zhou   sp. nov. Pseudohesperus tripartitus Li & Zhou   sp. nov. differs from the latter species by distinctly smaller eyes and completely different paramere of aedeagus.


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