Buobellenden jingyuanensis Yin et Nomura

Yin, Zi-Wei & Zhao, Shûhei Nomura Mei-Jun, 2009, Buobellenden jingyuanensis gen. et sp. nov. of the subfamily Pselaphinae (Coleoptera, Staphylinidae) from Northwestern China, Zootaxa 2083, pp. 65-68 : 66

Buobellenden jingyuanensis Yin et Nomura sp. nov.

( Figs. 1–14 )

Type material. Holotype: CHINA: Ningxia Autonomous Region: 3, Jingyuan County, Liupanshan National Nature Reserve, Dong-Shan-Po, 23-VI-2008, Yun-Bu leg. Deposited in the Insect Collections of the Department of Biology, Shanghai Normal University, Shanghai, P. R. China.

Description. Body length 1.89 mm, width 0.68 mm; body reddish brown, maxillary palpi and tarsi light brown.

Head elongate, ovoid in dorsal view, frons broadened along anterior margin, projected at apex, constricted behind antennal base, with a longitudinal groove in the middle part and a pair of tentorial pits between eyes, vertex gently convex, with a shallow median concavity, postgenae broad, gradually constricted through length, gular area smooth. Eyes small, ovoid, each composed of seven to eight facets. Antennae ( Fig. 1 ) long and slender, 1st segment elongate and thick, subcylindrical, slightly thickened distad, 2nd broadened, nearly as large as 9th, 3rd to 8th subequal in width, each small and slightly elongate, 9th and 10th subequal, each large, constricted at base, broadened at apex, 11th the largest, slightly pointed from the middle toward apex, about two times as long as wide, widest at middle, relative length (width) of each segment from base to apex: 2.0(1.0): 1.0(0.9): 0.9(0.8): 0.8(0.7): 0.9(0.7): 0.9(0.7): 0.9(0.7): 0.8(0.8): 1.2(1.0): 1.3(1.2): 2.2(1.8). Maxillary palpi ( Fig. 5 ) long and slender, weakly curved near base, 2nd segment elongate, slender in basal half, then thickened distally, 3rd short and nearly triangular, 4th the largest, nearly as long as 2nd, slightly constricted at base, broadened throughout length, widest at middle, covered with dense setae.

Pronotum ( Fig. 6 .) silghtly wider than long, widest at anterior 1/4, sparsely covered with setae at anterior and posterior margins, the remaining parts smooth. Elytra ( Fig. 2 .) nearly trapezoidal, gently convex, but weakly concave near base, each with one basimedian and two basilateral foveae, and with an adsutural and a median longitudinal carinae, sparsely covered with hairs on dorsal surface, but especially dense at basal part. Mesoventrite ( Fig. 3 ) smooth and convex; metaventrite convex medially and covered with setae anteriorly; coxal cavities contiguous.

Legs ( Figs. 7–9 ) short, elongate, thick in femora, slender in tarsi and tibae, tarsal claw single.

Abdomen broad, 4th tergite broadest, nearly trapezoidal, gently convex, 5th paratergites narrow, slightly arcuate and parallel-sided, 5th to 7th abdominal segments short and transverse, visible part of 8th ( Fig. 10 ) semicircular, emarginate at apex, 9th not visible in dorsal view, strongly arcuate at middle, 4th ventrite broad and transverse, slightly convex, covered with setae in apical area, 5th to 6th each short and transverse, 7th ( Fig. 11 ) strongly incurved at the middle, 8th oval, slightly emarginate at apex. Aedeagus well sclerotized apically, parameres paired and almost symmetrical, slender and slightly pointed at apex, each with two long setae at apex, median lobe asymmetrical, tridentate at apex, basal capsule bulbous, with an elliptical membranous part, endophallus weakly sclerotized.

Female unknown.

Remarks. This new species is characteristic in the unique shape of the 4th segment of maxillary palpi and aedeagus, as discussed for the genus. On the basis of these characters, it can easily be distinguished from all others from the Palaearctic region.

Distribution. Southwest China (Ningxia Autonomous Region).

Etymology. The specific name is referred to the name of the type locality.

Figures

FIGURES 1 – 14. Details of Buobellenden jingyuanensis sp. nov. 1 — left antenna in dorsal view; 2 — left elytron (showing positions of the foveae, carinae and hairs (hairs are replaced by dots )); 3 — meso- and metaventrite; 4 — head, in dorsal view; 5 — left maxillary palpus; 6 — pronotum, in dorsal view; 7 — foreleg; 8 — mid leg; 9 — hind leg; 10 — 7 th – 8 th tergites; 11 — 6 th – 8 th ventrite; 12 — aedeagus, in lateral view; 13 — ditto, in dorsal view; 14 — ditto, in ventral view. Scale bars 0.2 mm.