Cephennomicrus semidividus, Jałoszyński, 2018

Jałoszyński, Paweł, 2018, Revision of Cephennomicrus of Australia (Coleoptera, Staphylinidae, Scydmaeninae), Zootaxa 4422 (2), pp. 151-183 : 172

Cephennomicrus semidividus sp. n.

( Figs 85–90 , 123 )

Type material. Holotype: AUSTRALIA (AUSTRALIAN CAPITAL TERRITORY): ♂, three labels: " 35.22 S 148.50 E / Blundells Ck. 3km / E of Picadilly / Circus,850,ACT / Apr.1995 Weir, Lawrence,Johnson" [white, printed], "flight intercept / window/trough / trap" [white, printed], " CEPHENNOMICRUS / semidividus m. / P. Jałoszyński, '18 / HOLOTYPUS " [red, printed] ( ANIC).

Diagnosis. BL 0.73 mm; body slender, EI 1.31; antennomeres III–X each as long as broad; antennal club trimerous and indistinctly delimited; inner pair of pronotal antebasal pits not connected, pronotal base with additional small median pit; vertex and frons in males unmodified, but clypeus partly demarcated from frons by deep lateral transverse sulci; aedeagus stout, endophallus weakly sclerotized.

Description. Body of male ( Fig. 79 ) slender and moderately convex, uniformly dark reddish brown; setae on head, pronotum and elytra short, dense and recumbent, but well-discernible at magnification 40 ×. BL 0.73 mm.

Head ( Fig. 86 ) broadest at large, strongly convex and coarsely faceted eyes, HL 0.10 mm, HW 0.18 mm; vertex and frons evenly and weakly convex; clypeus partly demarcated from frons by a lateral pair of deep transverse sulci and with distinctly angulate, slightly projecting anterolateral corners; supraantennal tubercles weakly elevated. Setae on frons directed anteromesad, those on vertex forming a pair of lateral patches, in each setae directed mesad and posteromesad; punctures fine and inconspicuous. Antennae slender, with indistinctly delimited trimerous club, AnL 0.30 mm, antennomeres I–II distinctly elongate, III–X each about as long as broad, XI about as long as IX and X combined, indistinctly shorter than broad.

Pronotum subtrapezoidal, broadest near anterior fourth; PL 0.20 mm, PW 0.23 mm; anterior and posterior margins weakly arcuate, anterior corners broadly rounded, sides strongly rounded in anterior third and indistinctly concave in posterior half, posterior corners weakly obtuse-angled; base with two lateral pairs of small but distinct pits, inner pair not connected, additionally a small median pit is present; lateral pronotal carinae not serrate. Punctures on pronotal disc fine, inconspicuous.

Elytra oval, broadest distinctly anterior to middle; EL 0.43 mm, EW 0.33 mm, EI 1.31; humeral calli distinct; apices separately rounded. Punctures similar to those on pronotal disc.

Legs moderately long and slender, unmodified.

Aedeagus ( Figs 87–90 ) stout; AeL 0.13 mm; median lobe in ventral view oval, endophallus and flagellum weakly sclerotized and poorly visible; each paramere with one moderately long apical seta.

Female. Unknown.

Distribution ( Fig. 123 ). Australian Capital Territory.

Etymology. The name semidividus refers to the modified clypeus in males; it is not entirely and indistinguishably fused with the frons, as in most other congeners, but partly demarcated by deep lateral transverse sulci.

Remarks. The clypeal modification, elongate body and an additional median antebasal pronotal pit represent a unique combination of characters to identify C. semidividus .

Figures

FIGURE 123. Distribution of Cephennomicrus in Australia; white circles denote nominal species, solid black circles denote undescribed species known from females only (distribution of undescribed species known from the same localities as nominal ones is omitted).

FIGURES 79–90. Cephennomicrus tuberculifrons sp. n. (79–84) and C. semidividus sp. n. (85–90). Dorsal habitus (79, 85); head of male in dorsal view (80, 86); aedeagus in ventral (81, 83, 87, 89) and lateral (82, 84, 88, 90) views.