Cephennomicrus curvidens, Jałoszyński, Paweł, 2015

Jałoszyński, Paweł, 2015, Four new species of Cephennomicrus Reitter (Coleoptera, Staphylinidae, Scydmaeninae) from Malaysia, Zootaxa 3911 (2), pp. 273-279 : 274-275

Cephennomicrus curvidens sp. n.

( Figs. 1 , 5 , 9–10 )

Type material. Holotype: WEST MALAYSIA (Pahang/Selangor States): ♂, two labels: " MALAYSIA, / GENTING Highlands / # 49, 8 II 1998 / G. O'Reilly" [white, printed]; " Cephennomicrus / curvidens m. / det. P. Jałoszyński, '14 / HOLOTYPUS " [red, printed] ( MNHW).

Diagnosis. BL about 1 mm; pronotum with two pairs of pits; each elytron with two macrosetae; aedeagus in ventral view with sharply demarcated apical part and two robust elongate sclerites curved mesally and projecting distally.

Description. BL 1.05 mm. Body of male ( Figs. 1 , 5 ) elongate and convex, brown with slightly lighter macrosetae.

Head broadest at large, strongly convex and coarsely faceted eyes, HL 0.15 mm, HW 0.25 mm; vertex and frons confluent and convex; supraantennal tubercles feebly marked. Punctures on head dorsum fine and inconspicuous; setae indiscernible under magnification 80x. Antennae slender and with club composed of enlarged antennomeres X–XI, AnL 0.45 mm, antennomeres I–II elongate; III–IX about as broad as long; X distinctly transverse; XI only slightly longer than X and about 1.2x as long as broad; antennomeres X–XI with several strongly erect, long setae among short and suberect basic setation.

Pronotum ( Fig. 5 ) subrectangular, broadest near anterior fourth; PL 0.28 mm, PW 0.35 mm; anterior and lateral margins in anterior third broadly rounded, sides in posterior half slightly concave; anterior corners visible only in anterodorsal view, distinct and sharp but with rounded tips; posterior margin slightly arcuate with indistinct flattening in front of mesoscutellum; posterior corners nearly right-angled; pronotal base with two pairs of small but distinct pits. Punctures on pronotal disc as fine as those on frons and vertex; pronotal disc with very short, sparse and recumbent setae and macrosetae: two lateral pairs and one posterior pair in front of mesoscutellum.

Elytra ( Fig. 5 ) oval, broadest anterior to middle; EL 0.63 mm, EW 0.48 mm, EI 1.32; humeral calli wellmarked, elongate. Punctures on elytra fine and inconspicuous; basic setation extremely short so that elytra appear asetose under magnification 80x, except two lateral macrosetae on each elytron. Hind wings well developed.

Legs moderately long and slender, unmodified.

Aedeagus ( Figs. 9–10 ) in ventral view stout and approximately drop-shaped; AeL 0.21 mm; median lobe with sharply demarcated apical part, apex subtrapezoidal; internal armature complicated and asymmetrical, with a subapical and exposed pair of large hook-like sclerites strongly curved mesally; parameres slender and not reaching apex of median lobe, each with two apical setae.

Female. Unknown.

Distribution. Peninsular Malaysia, a border area between states Pahang and Selangor.

Etymology. The epithet curvidens reflects the curved sclerites of the endophallus.

Remarks. The structure of endophallus is unique in C. curvidens and the large curved sclerites are an unambiguous key character. These sclerites resemble shorter structures known in the Cephennomicrus nomurai species group. However, in the latter lineage of Cephennomicrus , known to occur in Japan and Taiwan, the external morphology is clearly different: all species have a longitudinal median groove on the pronotum, macrosetae are absent and males have various modifications of the frons ( Jałoszyński 2009).

Figures

FIGURES 1 – 4. Dorsal habitus of holotype males. 1 ― Cephennomicrus curvidens sp. n.; 2 ― Cephennomicrus gentingensis sp. n.; 3 ― Cephennomicrus santubongensis sp. n.; 4 ― Cephennomicrus muluensis sp. n.

FIGURES 5 – 8. Body outline and distribution of macrosetae. 5 ― Cephennomicrus curvidens sp. n.; 6 ― Cephennomicrus gentingensis sp. n.; 7 ― Cephennomicrus santubongensis sp. n.; 8 ― Cephennomicrus muluensis sp. n.

FIGURES 9 – 16. Aedeagi of holotype males in ventral (9, 11, 13, 15) and lateral (10, 12, 14, 16) views. 9 – 10 ― Cephennomicrus curvidens sp. n.; 11 – 12 ― Cephennomicrus gentingensis sp. n.; 13 – 14 ― Cephennomicrus santubongensis sp. n.; 15 – 16 ― Cephennomicrus muluensis sp. n.