Cephennomicrus siamensis (Franz)

Jałoszyński, Paweł, 2015, Notes on the systematic placement of Eutheia siamensis Franz (Coleoptera, Staphylinidae, Scydmaeninae), Zootaxa 4021 (3), pp. 493-498 : 494-495

Cephennomicrus siamensis (Franz)

( Figs 1–6 )

Euthia siamensis Franz, 1975: 52 , fig. 1 ( Euthia Agassiz, 1847 is an unjustified emendation of Eutheia Stephens, 1830 ).

Type material. Holotype: THAILAND (Nakhon Ratchasima Province): ♂, three original labels ( Fig. 3 ): "Sakaerat Exp. Stat. / Thailand,lg.Franz" [white, printed], " Euthia / siamensis m. / det.H.Franz" [white, handwritten and printed], " Typus " [red, handwritten]; during the present study white printed label was added: " CEPHENNOMICRUS / siamensis ( Franz, 1975) / det. P. Jałoszyński, 2015 " ( NHMW).

Diagnosis. BL <0.80 mm; head with short cushion-like tempora and pair of elongate oblique impressions extending anteromesally from mesal margin of each eye; pronotum with lateral pair of pits and transverse antebasal impression deepened at each end; aedeagus pear-shaped, with nearly symmetrical internal armature composed of elongate sclerites and median tubular component; parameres broad and with apices reaching apex of median lobe.

Description. BL 0.78 mm. Body of male ( Figs 1–2 ) elongate and convex, brown, legs and setae slightly lighter.

Head broadest at large, strongly convex and coarsely faceted eyes, HL 0.10 mm, HW 0.16 mm; vertex and frons confluent, weakly convex; frons between eyes with pair of elongate impressions extending anteromesally from mesal margin of each eye and not connecting at middle; eyes bean-shaped, area in posteromedian emargination of each eye bulging and in dorsal view visible as cushion-like protuberance. Punctures and setae on frons and vertex inconspicuous, fine. Antennae short, AnL 0.30 mm; antennomeres I and II elongate, III–VIII each about as long as broad or slightly transverse; antennomeres IX–XI distinctly enlarged and forming club, antennomeres IX–X distinctly transverse, XI only 1.6× as long as broad, with rounded apex.

Pronotum ( Fig. 2 ) semioval in dorsal view, broadest at base; PL 0.20 mm, PW 0.25 mm; pronotal base with shallow transverse impression deepened at each end and with distinct pair of small lateral pits. Punctures on pronotal disc fine and inconspicuous; setae short, sparse and recumbent.

Elytra oval, broadest near middle; EL 0.48 mm, EW 0.33 mm, EI 1.46; humeral calli distinct, subhumeral line rounded but distinct, basal elytral foveae rudimentary, barely discernible. Punctures on elytra similar to those on pronotum; setae short, dense, recumbent.

Legs moderately long and slender, all tibiae nearly straight.

Aedeagus ( Figs 4–6 ) pear-shaped, AeL 0.15 mm; median lobe in ventral view broadest in basal half and narrowing distally to form subtrapezoidal apex with nearly straight apical margin; internal armature nearly symmetrical, composed of elongate sclerites and median tubular component; parameres broad and short, in studied specimen setae are broken off, but Franz (1975) illustrated both parameres with two apical and one subapical seta.

Female. Unknown.

Distribution. North-eastern Thailand.

Figures

FIGURES 1 – 6. Holotype male of Cephennomicrus siamensis (Franz) comb. n. Dry-mounted specimen (1); reconstructed body outline (2); set of original labels (3); aedeagus in ventral (4, 5) and lateral view (6).