Stilicoderus sociabilis, 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 : 487-489

Stilicoderus sociabilis nov.sp. ( Figs 8-13 )

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 sociabilis sp. n. det. V. Assing 2013" (SMNS). Paratypes: 1, 4: same data as holotype (SMNS, cAss).

E t y m o l o g y: The specific epithet (Latin, adjective) alludes to the fact that this species apparently shares its habitat with the syntopic S. seticollis .

D e s c r i p t i o n: Body length 4.8-5.5 mm; length of forebody 3.1-3.2 mm. Length of antenna 1.6-1.7 mm. Habitus as in Fig. 8 . Lateral margins of pronotum with few (<5) setae. Other external characters ( Fig. 9 ) highly similar to those S. seticollis .

: sternite VII ( Fig. 10 ) strongly transverse, posterior margin symmetrically bisinuate (i.e., general outline concave, in the middle broadly convex), laterally with dense moderately long black setae; sternite VIII ( Fig. 11 ) strongly transverse and with dense pubescence, posterior margin broadly concave; aedeagus ( Figs 12-13 ) approximately 0.8 mm long and of distinctive shape.

C o m p a r a t i v e n o t e s: Aside from its slightly larger size and the presence of fewer long setae on the pronotum, S. sociabilis is distinguished from the syntopic S. seticollis by the different shape and chaetotaxy of the male sternite VII, the broader, more transverse, and posteriorly more strongly concave male sternite VIII, and by the much 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 .

Figures

Figs 8-15: Stilicoderus sociabilis nov.sp. (8-13) and S. bacchusi (ROUGEMONT) (14-15): (8) habitus; (9) forebody; (10, 14) male sternite VII; (11, 15) male sternite VIII; (12-13) aedeagus in lateral and in ventral view. Scale bars: 8-9: 1.0 mm; 10-15: 0.2 mm.