Stiliderus tridentatus, 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 : 495-498

Stiliderus tridentatus nov.sp. ( Figs 39-44 )

T y p e m a t e r i a l: Holotype: " SULAWESI: Kotamobagu, Modoinding, Gn. Ambang, 6.XII.1999, 1450 m, leg. A. Riedel / Holotypus Stiliderus tridentatus sp. n. det. V. Assing 2013" (SMNS). Paratypes: 6, 12 [partly somewhat teneral]: same data as holotype (SMNS, cAss).

E t y m o l o g y: The specific epithet (Latin, adjective) alludes to the three dorsal teeth on the dorsal side of the apex of the ventral process of the aedeagus.

D e s c r i p t i o n: Body length 5.4-6.6 mm; length of forebody 3.5-3.8 mm. Habitus as in Fig. 39 . Coloration: body black; legs with dark-brown femora and yellowish-brown tibiae and tarsi; antennae reddish.

Head ( Fig. 40 ) very weakly transverse, approximately 1.02 times as broad as long; lateral margins behind eyes smoothly rounded towards posterior constriction, posterior angles obsolete; punctures moderately coarse, very dense, somewhat oval, and not umbilicate; interstices without microsculpture, distinctly narrower than diameter of punctures. Eyes strongly bulging, approximately 0.4 times as long as distance from posterior margin of eye to posterior constriction in dorsal view. Antenna approximately 2.2 mm long

Pronotum ( Fig. 40 ) slender, approximately 1.3 times as long as broad and 0.75 times as broad as head, strongly convex in cross-section; punctation moderately coarse, extremely

dense, largely diagonally confluent (directed postero-laterad) on either side of midline; middle with narrow impunctate band without microsculpture.

Elytra ( Fig. 40 ) 0.80-0.85 times as long and approximately 1.45 times as broad as pronotum; humeral angles pronounced; punctation much coarser than that of head and pronotum and rather dense; interstices without microreticulation; laterally with an indistinct and somewhat irregular, narrow, slightly elevated, longitudinal glossy band. Hind wings present.

Abdomen as broad as, or slightly narrower than elytra, widest at segments V and VI; punctation extremely fine and extremely dense; pubescence very fine and indistinct; anterior portions of tergites III-VI with distinct transverse microsculpture, posterior portions of tergites with shallow microsculpture; posterior margin of tergite VII with palisade fringe.

: sternite VII ( Fig. 41 ) strongly transverse, posterior margin broadly concave; sternite VIII ( Fig. 42 ) transverse, posterior excision large and of semi-circular shape, apices on either side of this excision each with a tuft of dense and long black setae; aedeagus ( Figs 43-44 ) slender, approximately 1.05 mm long; ventral process distinctly asymmetric, apex with one left and two right dorsal teeth (ventral view).

C o m p a r a t i v e n o t e s: Based on the similar modifications of the male sternite VIII and of the aedeagus, S. tridentatus is closely allied to S. kakimerah ROUGEMONT 1996 and S. kakihitam ROUGEMONT 1996 , both described from Sulawesi, too. It is best distinguished from them by the shape of the aedeagus. For sketches of the aedeagi of S. kakimerah and S. kakihitam see ROUGEMONT (1996).

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 locality is situated near Kotamobagu in Sulawesi Utara, Celebes, Indonesia. The specimens were collected together with an unidentified Stiliderus species.

Figures

Figs 39-44: Stiliderus tridentatus nov.sp.: (39) habitus; (40) forebody; (41) male sternite VII; (42) male sternite VIII; (43-44) aedeagus in lateral and in ventral view. Scale bars: 39-40: 1.0 mm; 41- 44: 0.2 mm.