Stilicoderus seticollis, 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 : 485-487

Stilicoderus seticollis nov.sp. ( Figs 1-6 )

T y p e m a t e r i a l: Holotype: " MALUKU: Is. Morotai, W Daruba, Raja, 16.XI.1999, ca. 250 m, leg. A. Riedel / Holotypus Stilicoderus seticollis sp. n. det. V. Assing 2013" (SMNS). Paratypes: 2, 8: same data as holotype (SMNS, cAss).

E t y m o l o g y: The specific epithet (Latin, adjective) refers to the presence of numerous long setae on the pronotum.

D e s c r i p t i o n: Body length 4.3-4.8 mm; length of forebody 2.8-3.1 mm. Habitus as in Fig. 1 . Coloration: body black; legs with dark-brown to blackish-brown femora and with reddish to reddish-brown tibiae and tarsi; antennae reddish.

Head ( Fig. 2 ) distinctly transverse, approximately 1.25 times as broad as long, somewhat depressed, posteriorly of trapezoid shape, posterior angles moderately marked; punctation very dense, fine, and not umbilicate, interstices very narrow; dorsal surface with very weak shine; postero-lateral and dorsal surfaces with rather numerous very long dark setae. Eyes large and strongly bulging, approximately 0.7 times as long as distance from posterior margin of eye to posterior constriction in dorsal view. Antenna 1.5-1.6 mm long

Pronotum ( Fig. 2 ) weakly oblong, approximately 1.1 times as long as broad and 0.70- 0.75 times as broad as head, distinctly convex in cross-section; punctation very dense and distinctly granulose; interstices barely noticeable; surface practically matt; lateral margins each with numerous (approximately 7-10) very long black setae (often broken off); midline without impunctate band.

Elytra ( Fig. 2 ) approximately 0.95 times as long and 1.20-1.25 times as broad as pronotum; humeral angles marked; punctation dense and granulose, slightly finer and less dense than that of pronotum, and with numerous additional coarser, non-setiferous puncture-like impressions; interstices without microreticulation; surface less matt than that of pronotum. Hind wings not examined, but probably present.

Abdomen noticeably narrower than elytra; punctation very fine and dense; pubescence fine, short, and inconspicuous; anterior portions of tergites with distinct transverse microsculpture, posterior portions of tergites with shallower microreticulation; posterior margin of tergite VII with palisade fringe.

: sternite VII ( Fig. 3 ) strongly transverse, posterior margin asymmetrically, broadly concave, laterally with a cluster of approximately 5-6 long and stout black setae on either side; sternite VIII ( Fig. 4 ) strongly transverse and with sparse pubescence, posterior margin broadly concave; aedeagus ( Figs 5-6 ) 0.55-0.57 mm long and of distinctive shape.

C o m p a r a t i v e n o t e s: Without reference specimens for comparison, this species is reliably identified only based on the distinctive shapes and chaetotaxy of the male sternite VII and VIII, as well as on the morphology of the aedeagus. From the extremely similar following species from Maluku, S. seticollis additionally differs by slightly smaller body size, the more slender abdomen, and the more numerous long setae on the pronotum.

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 in Orotai, the northernmost island of Maluku. The specimens were collected at an altitude of approximately 250 m, together with the two following and one probably undescribed species (represented only by one female).

Figures

Figs 1-7: Stilicoderus seticollis nov.sp. (1-6) and S. bacchusi (ROUGEMONT) (7): (1) habitus; (2) forebody; (3) male sternite VII; (4) male sternite VIII; (5-7) aedeagus in lateral and in ventral view. Scale bars: 1-2: 1.0 mm; 3-7: 0.2 mm.