Cephennomicrus longissimus, Jałoszyński, 2018

Jałoszyński, Paweł, 2018, Revision of Cephennomicrus of Australia (Coleoptera, Staphylinidae, Scydmaeninae), Zootaxa 4422 (2), pp. 151-183 : 174

Cephennomicrus longissimus sp. n.

( Figs 91–96 , 123 )

Type material. Holotype: AUSTRALIA (QUEENSLAND): ♂, two labels: " 12.41S 142.41E / Batavia Downs QLD / 22 Jun–23 Aug 1992 / Flight Intercept Trap / P.Zborowski & J.Cardale" [white, printed], " CEPHENNOMICRUS / longissimus m. / P. Jałoszyński, '18 / HOLOTYPUS " [red, printed] ( ANIC).

Diagnosis. BL 0.71 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 connected by a shallow and diffuse transverse impression, pronotal base with additional small median pit; frons in males modified, with a pair of subtriangular tubercles in front of eyes, area between and in front of tubercles impressed and asetose, laterally demarcated by a pair of longitudinal angulate ridge and groove; aedeagus stout, with sharply demarcated small apical portion, endophallus with paired lateral elongate sclerites in subapical region.

Description. Body of male ( Fig. 91 ) slender and moderately convex, uniformly light brown; setae on head, pronotum and elytra very short, dense and recumbent, discernible at magnification 80 ×. BL 0.71 mm.

Head ( Fig. 92 ) broadest at large, strongly convex and coarsely faceted eyes, HL 0.08 mm, HW 0.18 mm; vertex evenly and weakly convex; frons in front of eyes with a pair of small subtriangular tubercles with sinuate lateral margins, area between and in front of tubercles impressed and asetose, laterally demarcated by angulate, longitudinal ridges, each accompanied by a lateral groove; supraantennal tubercles weakly elevated. Punctures fine and inconspicuous. Antennae slender, with indistinctly delimited trimerous club, AnL 0.33 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 0.21 mm, PW 0.25 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 connected by a shallow and diffuse transverse impression, 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 93–96 ) stout; AeL 0.20 mm; median lobe in ventral view oval with a sharply delimited short semioval apical region and a subtriangular apex of dorsal wall; sclerotized endophallic structures restricted to subapical region, symmetrical, relatively inconspicuous; each paramere with five apical and subapical setae of various lengths, of which one is remarkably thickened.

Female. Unknown.

Distribution ( Fig. 123 ). Queensland.

Etymology. The name longissimus refers to the unusually elongate, slender body.

Remarks. The slender body form and the modified anterior portion of frons in males are sufficient to identify this remarkable 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 91–102. Cephennomicrus longissimus sp. n. (91–96) and C. bipunctatus sp. n. (97–102). Dorsal habitus (91, 97); head of male in dorsal view (92, 98); aedeagus in ventral (93, 95, 99, 101) and lateral (94, 96, 100, 102) views.