Cephennula sibugana sp. n. (Figs. 10, 27, 28) Holotype: E MALAYSIA: 3, two labels: "Borneo Sabah \ Sepilok Sibuga Forest Res. \ nr. Sandakan 9.vi.1968 \ 68.378 \ R.W. Tazlor" [white, partly printed, “Sepilok” crossed out, “Sibuga” and numbers handwritten in black ink]; " CEPHENNULA \ sibugana m. \ det. P. Jałoszyński, 2011 \ HOLOTYPUS " [red, printed] (MHNG). Diagnosis. Body length between 0.7 and 0.8 mm; antennal club strongly flattened and compact; head nearly evenly covered with large, deep and dense punctures; punctures on median part of pronotum moderately large, dense; sublateral pronotal carinae as long as pronotum; ante-basal pronotal groove with distinct median fovea; subhumeral carinae nearly as long as 1/ 2x EL, humeral carinae less distinct and about half shorter; aedeagus in ventral view bottle-shaped with subtrapezoidal and rounded apex; endophallus composed of lightly pigmented elongate tubular structure. Description. Body of male (Fig. 10) strongly convex, elongate, with shallow but distinct constriction between pronotum and elytra, moderately glossy, dark brown, covered with yellowish vestiture, legs and antennae slightly lighter. BL 0.75 mm. Head broadest at large, coarsely faceted and strongly convex eyes, HL 0.10 mm, HW 0.19 mm; vertex and frontoclypeal area convex; supraantennal tubercles barely marked. Punctures on head dorsum nearly equally distributed, large, deep and dense; setae very short and sparse, nearly recumbent. Antennae with strongly enlarged, strongly flattened and compactly assembled antennomeres X–XI and only slightly enlarged antennomere IX, so that club appears two-segmented, AnL 0.25 mm; antennomere I about 1.3x as long as broad; II 2.2x as long as broad; III and IV each about 1.1x as long as broad; V 1.2x as long as broad; VI 1.1x as long as broad; VII 1.2x as long as broad; VIII slightly broader but shorter than VII, as long as broad; IX distinctly broader and slightly longer than VII, distinctly transverse; X much broader and longer than IX, strongly transverse; XI about as broad as X but only 1.1x as long as broad. Pronotum approximately semielliptical, broadest between middle and anterior 1/3; PL 0.25 mm, PW 0.31 mm, anterior margin weakly rounded; lateral margins distinctly microserrate, broadly rounded in anterior 2/3, straight and parallel in posterior 1/4; hind angles sharp and acute; posterior margin very weakly bisinuate; sublateral carinae distinct and as long as pronotum.. Transverse ante-basal groove shallow and indistinct, slightly arcuate and with distinct median foveae; sublateral ante-basal foveae small and indistinct; lateral ante-basal foveae larger and deeper. Punctures on median part of pronotal disc slightly smaller and shallower than those on head but distinct and dense, areas between sublateral carinae and lateral margins of pronotum covered with much larger and denser, coarse punctures; setae sparse, moderately long, only slightly suberect. Elytra strongly convex, oval, broadest between middle and anterior 1/3; EL 0.40 mm, EW 0.35 mm, EI 1.14; base of each elytron with rudimentary basal fovea located much closer to scutellum than to base of humeral carina; subhumeral carinae very distinct and nearly as long as 1/ 2x EL, nearly twice as long as less distinct humeral carinae. Punctures on elytra very fine and very shallow, barely discernible under 100x magnification; setae similar as those on pronotum. Legs moderately long and slender; pro- and mesotibiae nearly straight, metatibiae distinctly curved. Aedeagus (Figs. 27, 28) in ventral view bottle-shaped with moderately narrow, subtrapezoidal apex and strongly rounded apical margin; AeL 0.13 mm. Endophallus lightly pigmented, with median tubular structure; parameres slender, not exceeding apex of median lobe, each bearing two apical and one subapical seta. Female. Unknown. Distribution. East Malaysia (Borneo: Sabah). Etymology. Locotypical, after the Sibuga Forest in Borneo.

Published as part of Jałoszyński, Paweł, 2011, Ten new species of Cephennula Jałoszyński (Coleoptera, Staphylinidae, Scydmaeninae) from Malaysia, pp. 36-52 in Zootaxa 3113 on pages 49-50, DOI: 10.5281/zenodo.279337