Drusilla serrulae, Pace, 2014

Pace, R., 2014, Aleocharinae from Sabah (Borneo) collected by Guillaume de Rougemont (Coleoptera, Staphylinidae), Linzer biologische Beiträge 46 (1), pp. 727-794 : 754-755

Drusilla serrulae nov.sp. ( Figs 40 and 169-173 )

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: 11, same provenance as the holotype (CROU, MSNV).

D e s c r i p t i o n: Length 4.5-4.69 mm. Fore-body slightly shiny, abdomen shiny. Body brown, abdomen reddish with the third to fifth free abdominal tergites brown, antennae blackish-brown with the two basal antennomeres and the base of third yellowish-red, legs yellowish-red. Second antennomere shorter than the first, third longer than the second, fourth to tenth transverse. Eyes longer than the postocular region in dorsal view. Reticulation of the fore-body evident, that of the abdomen transverse and clearly visible. Puncturation of head and abdomen very superficial and close, absent on frons. Strong granulation denser in the median occipital area. Granulation of pronotum and elytra dense and evident, more salient near the suture of the elytra. There is a salient umbonate elevation between the antennae. The pronotum bears a fine median sulcus. Male fifth free abdominal tergites with two large posterior median punctures, arranged in a transverse line. Aedeagus: Figs 169-170 ; spermatheca: Fig. 173 , male sixth free tergite: Fig. 171 ; female sixth free tergite: Fig. 172.

C o m p a r a t i v e n o t e s: The habitus and shape of the spermatheca of this new species point to an affinity with D. operosa PACE, 1986 also from Borneo. However the fourth antennomere of the new species is transverse, whereas that of D. operosa is longer than wide. The intermediary portion of the spermatheca between the distal and proximal bulbs is short (0.07 mm) in the new species, whereas it is 0.12 mm long in D. operosa .

E t y m o l o g y: The name of the new species means "serrate" (from the Latin serrula = a saw) in reference to one of the internal sclerotised pieces of the aedeagus which is shaped like the teeth of a saw.

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.