Tropimenelytron sinuosum, Assing, 2011

Assing, V., 2011, Six new species and additional records of Aleocharinae from China (Coleoptera: Staphylinidae: Aleocharinae), Linzer biologische Beiträge 43 (1), pp. 291-310 : 299-301

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Tropimenelytron sinuosum


Tropimenelytron sinuosum nov.sp. ( Figs 20-23 View Figs 20-27 , 33-35 View Figs 28-37 )

T y p e m a t e r i a l: Holotype: " China: Yunnan, Baoshan Pref., Gaoligong Shan , 32 km SE Tengchong, 2150-2250 m, 24°51-53'N, 98°45'E, devast. prim. and second. forest, litter, dead wood, mushrooms sifted, 26.VIII.2009, leg. M. Schülke [CH09-08/09] / Holotypus Tropimenelytron sinuosum sp. n. det. V. Assing 2010" (cAss). Paratypes: 2: same data as holotype (cSch); 1, 1: " China (Yunnan) Pu´er Pref., Ailao Shan , 37 km NW Jingdong, 24°45'12''N, 100°41'24.5''E, 2300 m (devastated forest remnant, litter/moss/grass roots sifted, 13.IX.2009, D. W. Wrase [48]" (cSch, cAss); 1: " China: Yunnan, Lincang Pref., Wuliang Shan, old pass road, W side, 24°42'58.6''N, 100°29'52.0''E, 2200 m, small creek valley with primary forest remnant, litter & debris sifted, 12.IX.2009, M. Schülke [CH09-47]" (cSch). GoogleMaps

D e s c r i p t i o n: Body length 3.0-4.0 mm. Coloration: head, pronotum, and abdomen (except for the paler apex) blackish; elytra yellowish, with the scutellar region and the postero-lateral angles diffusely and more or less extensively infuscate, rarely most of elytra dark; legs yellowish; antennae blackish-brown.

Head ( Fig. 20 View Figs 20-27 ) approximately as wide as long; punctation sparse and extremely fine, barely noticeable; interstices with very shallow microsculpture, glossy. Eyes large, approximately twice as long as postocular region in dorsal view. Antenna slender; antennomere IV weakly transverse; V-X gradually and weakly increasing in width; X approximately 1.5 times as wide as long; XI approximately as long as the combined length of IX and X.

Pronotum ( Fig. 20 View Figs 20-27 ) with sexual dimorphism, slender, approximately 1.20-1.25 times as wide as head; posterior angles weakly marked; punctation sparse and very fine, but more distinct than that of head; on either side of middle with two larger punctures, the four punctures approximately forming a square or an oblong rectangle; surface with shallow microsculpture and glossy.

Elytra ( Fig. 20 View Figs 20-27 ) with pronounced sexual dimorphism, 0.8 (large male) to 0.95 (female) times as long as, and much broader than pronotum; humeral angles pronounced; punctation fine and dense; interstices with shallow microsculpture. Hind wings fully developed.

Abdomen with very sparse punctation and transverse microsculpture, glossy; posterior margin of tergite VIII with palisade fringe.

: pronotum approximately as long as wide and produced posteriorly, middle of dorsal surface flattened (only in large male), posterior margin pointed in the middle ( Fig. 20 View Figs 20-27 ); elytra with enormous sinuose carinae on either side of middle, extending well beyond middle of suture ( Fig. 20 View Figs 20-27 ); tergite VII near posterior margin with smooth median tubercle ( Fig. 33 View Figs 28-37 ); posterior margin of tergite VIII truncate, serrulate, and with marked lateral angles; sternite VIII broadly convex posteriorly; median lobe of aedeagus 0.35-0.38 mm long, shaped as in Figs 21-22 View Figs 20-27 .

: pronotum approximately 1.05 times as wide as long, posterior margin weakly convex; elytra and abdominal tergite VII without modifications; tergite VIII broadly and weakly convex posteriorly ( Fig. 34 View Figs 28-37 ); posterior margin of sternite VIII distinctly concave in the middle ( Fig. 35 View Figs 28-37 ); spermatheca as in Fig. 23. View Figs 20-27

I n t r a s p e c i f i c v a r i a t i o n: The somewhat smaller male paratype has less pronounced male secondary sexual characters than the holotype; the pronotum is not flattened in the middle and posteriorly less distinctly pointed, the sutural carinae are slightly less conspicuous, and the median tubercle at the posterior margin of the abdominal tergite VIII is smaller.

E t y m o l o g y: The name (Latin, adjective) refers to the conspicuous sinuose carinae on the male elytra.

C o m p a r a t i v e n o t e s: In both external and sexual characters, T. sinuosum is most similar to T. viaticum , from which it is readily distinguished by the distinctly larger eyes ( T. viaticum : eyes only slightly longer than postocular region), the much less pronounced microsculpture of the head and pronotum ( T. viaticum : microreticulation pronounced, surface only with subdued shine), the modifications of the male pronotum and elytra ( T. viaticum : posterior margin of pronotum weakly convex; elytral carinae short, weakly elevated, and straight), the smaller and differently shaped aedeagus, the distinct median concavity of the posterior margin of the female sternite VIII ( T. viaticum : very weakly concave), and the slightly different shape of the spermatheca. For illustrations of T. viaticum see Figs 24-27 View Figs 20-27 and PACE (1998c).

D i s t r i b u t i o n a n d n a t u r a l h i s t o r y: The type specimens were collected in three localities in Yunnan, by sifting litter in primary forest remnants and secondary forests at altitudes of 2150-2300 m.


Tavera, Department of Geology and Geophysics


Royal British Columbia Museum - Herbarium