Drusilla borneoacuta, Pace, 2014

Pace, R., 2014, Aleocharinae from Sabah (Borneo) collected by Guillaume de Rougemont (Coleoptera, Staphylinidae), Linzer biologische Beiträge 46 (1), pp. 727-794 : 755

Drusilla borneoacuta nov.sp. ( Figs 41 and 174-177 )

T y p e m a t e r i a l Holotype, Sabah, Danum Valley , B.R.L., f.i.t., 14-16.II.2007, G. de Rougemont leg. ( CROU).

D e s c r i p t i o n: Length 6.96 mm. Body shiny, blackish-brown, antennae blackishbrown with eleventh antennomere reddish, legs reddish with femora yellow. Second antennomere shorter than the first, third longer than the second, fourth to sixth as long as wide, seventh to tenth transverse. Eyes shorter than the postocular area in dorsal view. Reticulation of head and pronotum evident, absent on elytra, that of the abdomen irregular, polygonal, slightly transverse on two basal free tergites, with a longitudinal mesh on the male fifth free tergite. Puncturation of the head dense, that of pronotum, elytra and abdomen also very dense, but strong. Pronotum without a median sulcus, but with a broad median depression with a circular depression distant from the posterior margin. Male first free tegite with two lateral appendices and a sinuous posterior margin ( Fig. 177 ). Male fifth free tergite with a posterior median carina ( Fig. 177 ). Aedeagus: Fig. 174 . (?)

C o m p a r a t i v e n o t e s: In its habitus and in the form of the aedeagus, this new species is similar to D. bruneiorum PACE, 2008 also from Borneo. It differs in the colour of the body: pronotum brown in the new species, reddish in D. bruneiorum . The aedeagus of the new species is flexed to the ventral side in the preapical area, in D. bruneiorum it is almost rectilinear. The apex of the aedeagus of the new species is acute in ventral view, and broadly curved in D. bruneiorum .

E t y m o l o g y: The name of the new species means "Borneo acute" in reference to the acute apex of the aedeagus in ventral view.

Figures

Figs 34-45: Habitus. (34): Orphnebius concavus nov.sp., scale bar 3.4 mm; (35): Orphnebius parabigladiosus nov.sp., scale bar 3.9 mm; (36): Lambanus borneensis nov.sp., scale bar 6 mm; (37): Lambanus rougemonti nov.sp., scale bar 7.1 mm; (38): Drusilla divergens nov.sp., scale bar 7.1 mm; (39): Drusilla bulbosa nov.sp., scale bar 4.6 mm; (40): Drusilla serrulae nov.sp., scale bar 4.6 mm; (41): Drusilla borneoacuta nov.sp., scale bar 6.9 mm; (42): Drusilla caputserpentis nov.sp., scale bar 7.1 mm; (43): Drusilla bilobata nov.sp., scale bar 5 mm; (44): Drusilla sabahensis nov.sp., scale bar 3.9 mm; (45): Drusilla profunda nov.sp., scale bar 3.9 mm.

Figs 169-180: Aedeagus in lateral and ventral view, sixth free urotergum of male (171, 176) and female (172, 180), spermatheca and abdomen. (169-173): Drusilla serrulae nov.sp.; (174-177): Drusilla borneoacuta nov.sp.; (178): Drusilla caputserpentis nov.sp.; (179-180): Drusilla bilobata nov.sp. Scale bars: 0.1 mm.