Leptusa (Chondrelytropisalia) quinqueimpressa, 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 : 262-263

Leptusa (Chondrelytropisalia) quinqueimpressa nov.sp. ( Figs 25-37 , Map 2 )

T y p e m a t e r i a l: Holotype 6: China: Yunnan [CH07-27], Nujiang Lisu Aut. Pref., Gaoligong Shan , creek valley 20 km NW Liuku, 25°58'49"N, 98°41'48"E, 3000 m, bamboo, shrubs, litter sifted, 9. VI.2007, M. Schülke / Holotypus 6 Leptusa quinqueimpressa sp.n. det. V. Assing 2007 (cAss) . Paratypes: 2 exs.: same data as holotype (cSch, cAss) ; 2 exs.: China: Yunnan [CH07-26], Nujiang Lisu Aut. Pref., Gaoligong Shan , pass 21 km NW Liuku, 3150 m, 25°58'22"N, 98°41'00"E, bamboo with shrubs, litter sifted, 9. VI.2007, M. Schülke (cSch) .

D e s c r i p t i o n: 2.0- 2.6 mm. Habitus as in Fig. 25 . Coloration: body, including appendages, bright reddish, with abdominal segment VI and anterior half of segment VII blackish.

Head approximately as wide as long; puncturation coarse and dense, interstices narrower than diameter of punctures; microsculpture extremely shallow, barely noticeable. Eyes small, composed of approximately 20 ommatidia, weakly projecting from lateral contours of head, distinctly shorter than postocular region in dorsal view ( Fig. 26 ). Antennae relatively long and slender ( Fig. 27 ); antennomere IV approximately as long as wide; V indistinctly transverse; VI-X of increasing width and increasingly transverse; X slightly less than twice as wide as long. Maxillary palpus with penultimate palpomere little more than twice as long as wide.

Pronotum strongly convex in cross-section, weakly transverse, 1.12-1.20 times as wide as long and 1.15-1.20 times as wide as head; maximal width in anterior half; posterior angles marked; lateral margins in posterior half weakly concave in dorsal view; puncturation somewhat denser, less coarse, less deep, and less defined than that of head; microsculpture very shallow ( Fig. 26 ).

Elytra approximately as wide and at suture 0.8 times as long as pronotum; humeral angles obsolete; puncturation very coarse, well-defined, and dense; microsculpture absent ( Fig. 26 ). Hind wings reduced. Metatarsomere I almost as long as combined length of II and III.

Abdomen approximately 1.15 times as wide as elytra; segments IV-VI subparallel; maximal width at segment VI; tergites III-VII anteriorly with distinct impressions, that of tergite VII slightly shallower than those of tergites III-VI; anterior impressions with very coarse and dense puncturation; puncturation of remainder of tergal regions fine and moderately dense; microsculpture shallow, but distinct; posterior margin of tergite VII with narrow rudiment of a palisade fringe ( Fig. 28 ); tergite VII without evident sexual dimorphism.

6: sternite VII posteriorly truncate, at posterior margin with 6 and in median area with 4 additional conspicuously long black setae; tergite VIII as in Fig. 29 ; posterior margin of sternite VIII broadly convex ( Fig. 30 ); median lobe of aedeagus of highly distinctive morphology, ventral process almost covered by semitransparent and apically incised additional plate in ventral view ( Figs 34-35 ); apical lobe of paramere apically abruptly narrowed ( Figs 36-37 ).

♀: setae of sternite VII much shorter; tergite VIII as in Fig. 31 ; posterior margin of sternite VIII weakly convex ( Fig. 32 ); spermatheca with relatively long coiled duct ( Fig. 33 ).

E t y m o l o g y: The name (Latin, adjective: with five impressions) refers to the presence of anterior impressions on the abdominal tergites III-VII.

C o m p a r a t i v e n o t e s: The new species is readily distinguished from all its congeners by the distinctive morphology of the aedeagus. For characters separating it from other consubgeners known from China see the key 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: Thespeciesisknown from two localities to the northwest of Liuku, western Yunnan province, China ( Map 2 ). The types were collected by sifting the litter of bamboo and shrubs at altitudes of 3000-3150 m.

Figures

Map 2: Distributions of the species of the subgenus Chondrelytropisalia and L. schuelkei PACE in China: L. schuelkei (open square), L. tectusoides ASSING (filled square), L. quinqueimpressa nov.sp. (filled circles), and L. proiecta nov.sp. (open and filled circles).

Figs 25-33: Leptusa quinqueimpressa nov.sp.: (25) habitus; (26) forebody; (27) antenna; (28) abdominal segments III-VII; (29) male tergite VIII; (30) male sternite VIII; (31) female tergite VIII; (32) female sternite VIII; (33) spermatheca. Scale bars: 25: 0.5 mm; 26-32: 0.2 mm; 33: 0.1 mm.

Figs 34-37: Leptusa quinqueimpressa nov.sp.: (34-35) median lobe of aedeagus in lateral and in ventral view; (36) paramere; (37) apical lobe of paramere. Scale bars: 0.1 mm.