Stilicoderus brevisetosus, 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 : 489-491

Stilicoderus brevisetosus nov.sp. ( Figs 16-21 )

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 brevisetosus sp. n. det. V. Assing 2013" ( SMNS).

E t y m o l o g y: The specific epithet (Latin, adjective) refers to the short setae on the head and pronotum.

D e s c r i p t i o n: Body length 5.7 mm; length of forebody 3.5 mm. Habitus as in Fig. 16 . Coloration: body black; legs with dark-brown femora (except for the reddish apices) and with reddish tibiae and tarsi; antennae reddish.

Head ( Fig. 17 ) 1.25 times as broad as long, lateral margins behind eyes smoothly curving towards posterior constriction, posterior angles not marked; punctation dense, rather fine, and not umbilicate; interstices narrow, but noticeable, glossy; dorsal surface with some shine; postero-lateral and dorsal surfaces with relatively short setae. Eyes large and strongly bulging, approximately 0.8 times as long as distance from posterior margin of eye to posterior constriction in dorsal view. Antenna 1.8 mm long

Pronotum ( Fig. 17 ) weakly oblong, 1.15 times as long as broad and 0.78 times as broad as head, distinctly convex in cross-section; punctation very dense and distinctly granulose; interstices barely noticeable; surface practically matt; lateral margins with few thin and not conspicuously long dark setae; midline without impunctate band.

Elytra ( Fig. 17 ) 1.02 times as long and 1.25 times as broad as pronotum; humeral angles marked; punctation dense and granulose, similar to that of pronotum, but less dense, with numerous additional coarser, non-setiferous puncture-like impressions; interstices without microreticulation; surface with some shine. Hind wings not examined, but probably present.

Abdomen approximately as broad as elytra; punctation very fine and dense; pubescence fine, short, and inconspicuous; anterior impressions of tergites III-VI with pronounced microsculpture, posterior portions of tergites with shallow microreticulation; posterior margin of tergite VII with palisade fringe.

: sternite VII ( Fig. 18 ) strongly transverse, posterior margin symmetrically, weakly concave in the middle; sternite VIII ( Fig. 19 ) strongly transverse and with dense pubescence, very weakly concave; aedeagus ( Figs 20-21 ) 0.86 mm long and of distinctive shape both in lateral and in ventral view.

C o m p a r a t i v e n o t e s: From the similar and syntopic S. seticollis and S. sociabilis , S. brevisetosus is distinguished by slightly larger body size, slightly different head shape, the slightly less dense punctation of the head, the distinctly shorter setae on the head and pronotum, the different shape and chaetotaxy of the male sternite VII, the different shape and chaetotaxy of the male sternite VIII (pubescence much denser; posterior margin less distinctly concave), as well as by the larger and differently shaped aedeagus.

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 identical to that of S. seticollis and S. sociabilis .

Figures

Figs 16-22: Stilicoderus brevisetosus nov.sp. (16-21) and Stiliderus depressus ROUGEMONT (22): (16) habitus; (17) forebody; (18) male sternite VII; (19) male sternite VIII; (20-22) aedeagus in lateral and in ventral view. Scale bars: 16-17: 1.0 mm; 18-22: 0.2 mm.