Drusilla danumensis, Pace, 2014

Pace, R., 2014, Aleocharinae from Sabah (Borneo) collected by Guillaume de Rougemont (Coleoptera, Staphylinidae), Linzer biologische Beiträge 46 (1), pp. 727-794 : 758-759

Drusilla danumensis nov.sp. ( Figs 48 and 189-191 )

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). Paratypes: 6 exx., same provenance as the holotype (CROU, MSNV).

D e s c r i p t i o n: Length 3.35-3.48 mm. Body shiny, head and pronotum blackishbrown, elytra black with the base dirty yellow, abdomen yellowish-red with posterior portion of the paratergites blackish-brown and first to third free tergites reddish-brown on their mid-longitudinal area, fourth free tergite yellowish-red in basal half and blackish-brown in distal half, fifth free tergite brown, antennae reddish-brown with the three basal antennomeres and the eleventh yellowish-red, legs yellowish-red with femora yellow, except to the distal extremities which are yellowish-red. Second antennomere shorter than the first, third longer than the second, fourth to ninth as long as wide, tenth transverse. Eyes longer than the postocular region in dorsal view. Body devoid of reticulation. Puncturation of the head fine and absent on the longitudinal median band, that of the elytra evident and deep. Granulation of the pronotum fine, very superficial and salient. Two large median punctures on each free tergite that are otherwise bare. There is a deep depression between the antennae. Pronotum with a deep median sulcus, an ample anterior median impression, a deep impression on either side and two strong punctures near the median sulcus. Aedeagus: Figs 190-191 ; spermatheca: Fig. 189.

C o m p a r a t i v e n o t e s: In the form of the spermatheca and partly that of the aedeagus, and in the colour of the abdomen this new species is similar D. fontis PACE, 2008 also from Borneo. It differs in the transverse pronotum with length/width ratio of 0.88, whereas in D. fontis the pronotum is longer than wide with a length/width ratio of 1.10. The ventral profile of the aedeagus of the new species has an acute angle near the "crista apicalis", which is absent in D. fontis . The apex of the aedeagus of the new species, in ventral view, is not angled as the apex of the aedeagus of D. fontis .

E t y m o l o g y: The name of the new species is derived from the Danum Valley.

Figures

Figs 46-57: Habitus. (46): Drusilla borneoclara nov.sp., scale bar 5.8 mm; (47): Drusilla rougemontiana nov.sp., scale bar 5.5 mm; (48): Drusilla danumensis nov.sp., scale bar 3.4 mm; (49): Drusilla borneoapicalis nov.sp., scale bar 4.6 mm; (50): Drusilla borneostricta nov.sp., scale bar 7.5 mm; (51): Drusilla sabahorum nov.sp., scale bar 5.3 mm; (52): Drusilla trina nov.sp., scale bar 8 mm; (53): Drusilla borneoruficollis nov.sp., scale bar 6.8 mm; (54): Zyras (Glossacantha) plenus nov.sp., scale bar 9 mm; (55): Porus laminarum nov.sp., scale bar 11.3 mm; (56): Porus borneensis nov.sp., scale bar 5.3 mm; (57): Wroughtonilla sabahensis nov.sp., scale bar 4.6 mm.

Figs 181-194: Aedeagus in lateral and ventral view, spermatheca, sixth free urotergum of male. (181-182): Drusilla sabahensis nov.sp.; (183): Drusilla profunda nov.sp.; (184): Drusilla borneoclara nov.sp.; (185-188): Drusilla rougemontiana nov.sp.; (189-191): Drusilla danumensis nov.sp.; (192-194): Drusilla borneoapicalis nov.sp. Scale bars: 0.1 mm.