Leptusa (Yunnaleptusa) parvibulbata, Assing, 2008

Assing, V., 2008, Seven new species and additional records of Palaearctic Leptusa, primarily from Yunnan, China (Coleoptera: Staphylinidae: Aleocharinae), Linzer biologische Beiträge 40 (1), pp. 251-273 : 260-261

Leptusa (Yunnaleptusa) parvibulbata nov.sp. ( Figs 21-24 , 72 , Map 1 )

T y p e m a t e r i a l: Holotype 6: China: Yunnan [ CH 07-22], Nujiang Lisu Aut. Pref., Gaoligong Shan, valley 21 km W Gongshan, 27°47'03"N, 98°27'39"E, 3320 m, moss, alder, bamboo, Rhodod., sifted, 6.VI.2007, leg. A. Pütz / Holotypus 6 Leptusa parvibulbata sp.n. det. V. Assing 2008 (cAss).

D e s c r i p t i o n: 1.8 mm. Habitus as in Fig. 21 . Coloration: head dark brown; pronotum and elytra paler brown; abdomen blackish brown, with the anterior and the posterior segments (III, IV, VIII) indistinctly paler; legs and antennae dark yellowish.

Head approximately 1.10 times as wide as long; puncturation moderately dense and fine; microsculpture shallow, interstices with some shine. Eyes small and weakly projecting from lateral contours of head, composed of about 25 ommatidia, little more than half as long as postocular region in dorsal view. Antennae gradually incrassate apically; antennomere IV approximately as long as wide; V-X of increasing width and increasingly transverse; X more than twice as wide as long.

Pronotum strongly transverse, approximately 1.35 times as wide as long and 1.25 times as wide as head; maximal width slightly before the middle; posterior angles rounded, weakly marked; puncturation dense and fine; microsculpture shallow, but distinct.

Elytra slightly narrower than and at suture approximately 0.7 times as long as pronotum; humeral angles marked; puncturation dense, but less so than that of pronotum, much more pronounced than that of head and pronotum; interstices without evident microsculpture. Hind wings apparently reduced. Metatarsomere I only slightly longer than II.

Abdomen approximately 1.15 times as wide as elytra, maximal width at segments V-VI; segments III-V with rather shallow anterior impressions; segment VI without anterior impression; puncturation very fine and moderately dense; microsculpture shallow; posterior margin of tergite VII with narrow rudiment of a palisade fringe.

6: tergite VII unmodified; tergite VIII very shallowly concave in the middle ( Fig. 22 ); sternite VIII with distinctly convex posterior margin ( Fig. 23 ); median lobe of aedeagus shaped as in Fig. 24 ; apical lobe of paramere similar to that of other species of the subgenus.

♀: unknown.

E t y m o l o g y: The name (Latin, adjective) refers to the relatively small proximal capsule of the median lobe of the aedeagus.

C o m p a r a t i v e n o t e s: See description of the subgenus and the key to species above.

D i s t r i b u t i o n a n d b i o n o m i c s: The species is known only from one locality to the west of Gongshan, western Yunnan province, China ( Map 1 ). The holotype was sifted from moss and the litter of alder, bamboo, and Rhododendron at an altitude of 3320 m ( Fig. 72 ).

Figures

Map 1: Distributions of the species of the subgenus Yunnaleptusa in China: L. curvata ASSING (filled circles), L. recta ASSING (open circle), L. parvibulbata nov.sp. (filled square), and L. cultellata nov.sp. (open square).

Figs 21-24: Leptusa parvibulbata nov.sp.: (21) habitus; (22) male tergite VIII; (23) male sternite VIII; (24) median lobe of aedeagus in lateral view. Scale bars: 21: 0.5 mm; 22-23: 0.2 mm; 24: 0.1 mm.

Fig. 72: Type locality of Leptusa parvibulbata nov.sp. (photo by M. Schülke).