Cephennomicrus carinatus, Jałoszyński, 2018

Jałoszyński, Paweł, 2018, Revision of Cephennomicrus of Australia (Coleoptera, Staphylinidae, Scydmaeninae), Zootaxa 4422 (2), pp. 151-183 : 166

Cephennomicrus carinatus sp. n.

( Figs 58–63 , 123 )

Type material. Holotype: AUSTRALIA (QUEENSLAND): ♂, three labels: " 11.45E 142.35E / Heathlands, QLD / 15-26 Jan. 1992. T.A.Weir,I.D.Naumann" [white, printed], "F.I.T. / ANIC 1220 / open forest #1" [white, printed], " CEPHENNOMICRUS / carinatus m. / P. Jałoszyński, '18 / HOLOTYPUS " [red, printed] ( ANIC).

Diagnosis. BL 0.81 mm; body stout, EI 1.13; antennomeres III–IX each as long as broad; antennal club dimerous, sharply delimited and strongly flattened; inner pair of pronotal antebasal pits not connected; frons and vertex in males modified, with a posteromedian longitudinal carina flanked by broad and shallow impressions; aedeagus stout, drop-shaped, with relatively simple endophallus containing two lateral bunches of needle-like sclerites, subapical region of dorsal wall with paired setae.

Description. Body of male ( Fig. 58 ) stout, uniformly light brown; setae on head, pronotum and elytra very short, dense and recumbent, discernible at magnification 80 ×. BL 0.81 mm.

Head ( Fig. 59 ) broadest at large, strongly convex and coarsely faceted eyes, HL 0.10 mm, HW 0.23 mm; vertex and frons modified, with posteromedian longitudinal carina and area laterad the carina distinctly impressed; supraantennal tubercles weakly elevated. Punctures fine and inconspicuous. Antennae short, with sharply delimited dimerous and strongly flattened club, AnL 0.33 mm, antennomeres I–II distinctly elongate, III–IX each as long as broad, X distinctly transverse, XI about as long as broad.

Pronotum subtrapezoidal, broadest near anterior fourth; PL 0.26 mm, PW 0.35 mm; anterior margin arcuate, posterior margin nearly straight, anterior corners broadly rounded, sides strongly rounded in anterior third and indistinctly concave in posterior half, posterior corners strongly obtuse-angled and blunt; base with two lateral pairs of small but distinct pits, transverse groove absent; lateral pronotal carinae distinctly serrate. Punctures on pronotal disc fine, inconspicuous.

Elytra oval, broadest distinctly anterior to middle; EL 0.45 mm, EW 0.40 mm, EI 1.13; humeral calli distinct; apices separately rounded. Punctures similar to those on pronotal disc.

Legs moderately long and slender, unmodified.

Aedeagus ( Figs 60–63 ) moderately elongate; AeL 0.18 mm; median lobe in ventral view drop-shaped, its apex strongly bent dorsad, endophallus complicated, with four lateral bunches of long, needle-like sclerites; dorsal wall with paired setae in subapical region; each paramere with one apical and one subapical seta of equal length.

Female. Unknown.

Distribution ( Fig. 123 ). Queensland.

Etymology. The name carinatus refers to the longitudinal carina of the vertex in males.

Remarks. The simple distinct median carina located on the vertex is unique for males of this species.

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 58–63. Cephennomicrus carinatus sp. n. Dorsal habitus (58); head of male in dorsal view (59); aedeagus in ventral (60, 62) and lateral (61, 63) views.