Stilicoderus dilatatus, Assing, 2014

Assing, V., 2014, Seven new species and additional records of Stilicoderus and Stiliderus (Coleoptera: Staphylinidae: Paederinae), Linzer biologische Beiträge 46 (1), pp. 481-498 : 483

Stilicoderus dilatatus nov.sp. ( Figs 45-49 )

T y p e m a t e r i a l: Holotype: " TAIWAN: Anmashan, Taichung Hsien , 2100 m, Route second. km 34, L. LeSage LL90-36 / Holotypus Stilicoderus dilatatus sp. n. det. V. Assing 2013" (cAss).

E t y m o l o g y: The specific epithet is the past participle of the Latin verb dilatare (to broaden) and refers to the broad ventral process of the aedeagus, the character best distinguishing this species from the similar and closely related S. formosanus .

D e s c r i p t i o n: Body length 6.8 mm; length of forebody 4.2 mm. Habitus as in Fig. 45 . Coloration: body black; legs dark-reddish; antennae reddish.

Head ( Fig. 46 ) 1.07 times as long as broad, broadest behind eyes; lateral margins smoothly curved towards posterior constriction, posterior angles obsolete; punctation fine and dense, somewhat sparser in median dorsal portion; interstices without microsculpture. Eyes weakly convex and of moderate size, approximately one-third as long as distance from posterior margin of eye to posterior constriction in dorsal view. Antenna 2.4 mm long

Pronotum ( Fig. 46 ) 1.1 times as long as broad and 0.86 times as broad as head, strongly convex in cross-section; punctation dense and granulose, distinctly less fine than that of head; interstices without microsculpture; midline rather broadly impunctate.

Elytra ( Fig. 46 ) approximately as long as, and much broader than, pronotum; humeral angles marked; disc with double punctation, i.e., with rather coarse, dense, and somewhat irregular punctures and with granulose micropunctation. Hind wings present.

Abdomen as broad as elytra; punctation very fine and dense; interstices with distinct microsculpture; posterior margin of tergite VII with palisade fringe.

: sternite VII ( Fig. 47 ) with dense and fine pubescence and with nearly truncate posterior margin; sternite VIII ( Fig. 48 ) noticeably transverse, with dense and fine pubescence, and with shallow median impression, posterior excision deep and narrow, nearly half as deep as length of sternite, apices on either side of posterior excision somewhat elongated; aedeagus ( Fig. 49 ) 1.05 mm long and of distinctive shape.

C o m p a r a t i v e n o t e s: This species is distinguished from the externally highly similar S. formosanus by the posteriorly more strongly projecting apices and the deeper posterior excision of the male sternite VIII, as well as by the larger aedeagus with a distinctly broader ventral process (lateral view) of the aedeagus. For illustrations of the male sexual characters of S. formosanus see Figs 50-52.

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: Theholotypewascollectedin the Anma Shan, a mountain in Taichung Hsien, Taiwan, at an altitude of 2100 m.

Figures

Figs 45-52: Stilicoderus dilatatus nov.sp. and S. formosanus ROUGEMONT: (45) habitus; (46) forebody; (47, 50) male sternite VII; (48, 51) male sternite VIII; (49, 52) aedeagus in lateral view. Scale bars: 45-46: 1.0 mm; 47-52: 0.5 mm.