Cephennomicrus tuberculifrons, Jałoszyński, 2018

Jałoszyński, Paweł, 2018, Revision of Cephennomicrus of Australia (Coleoptera, Staphylinidae, Scydmaeninae), Zootaxa 4422 (2), pp. 151-183 : 171-172

Cephennomicrus tuberculifrons sp. n.

( Figs 79–84 , 123 )

Type material. Holotype: AUSTRALIA (QUEENSLAND): ♂, two labels: "Mt Formartine South / 10km N.Kuranda,N.Qld / 23 Nov 1990,700m / Monteith&Thompson / Pyrethrum-Trees&Logs" [white, printed], " CEPHENNOMICRUS / tuberculifrons m. / P. Jałoszyński, '18 / HOLOTYPUS " [red, printed] (QM).

Diagnosis. BL 0.75 mm; body slender, EI 1.33; antennomeres III–X each as long as broad; antennal club trimerous and indistinctly delimited; pronotum with a median longitudinal groove; inner pair of pronotal antebasal pits connected by a diffuse and shallow groove; frons in males modified, with an anteromedian tubercle between antennal insertions, area behind tubercle slightly impressed; aedeagus stout, endophallus complicated, containing two pairs of elongate distal projections.

Description. Body of male ( Fig. 79 ) slender and moderately convex, uniformly umbra-brown; setae on head, pronotum and elytra extremely short, dense and recumbent, barely discernible at magnification 80 ×. BL 0.75 mm.

Head ( Fig. 80 ) broadest at large, strongly convex and coarsely faceted eyes, HL 0.08 mm, HW 0.19 mm; vertex evenly and weakly convex; frons modified, with an anteromedian asetose tubercle between antennal insertions and slightly impressed behind tubercle; 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, about as long as broad.

Pronotum subtrapezoidal, broadest near anterior fourth; PL 0.23 mm, PW 0.26 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 nearly right-angled; disc with a median longitudinal groove; base with two lateral pairs of small but distinct pits, inner pair connected by a diffuse and shallow transverse groove; lateral pronotal carinae not serrate. Punctures on pronotal disc fine, inconspicuous.

Elytra oval, broadest distinctly anterior to middle; EL 0.45 mm, EW 0.34 mm, EI 1.33; humeral calli distinct; apices separately rounded. Punctures similar to those on pronotal disc.

Legs moderately long and slender, unmodified.

Aedeagus ( Figs 81–84 ) stout; AeL 0.23 mm; median lobe in ventral view drop-shaped, endophallus with one pair of long, pointed sclerites and one pair of shorter, recurved projections; flagellum not coiled; each paramere with one long apical, and one long and one short subapical setae.

Female. Unknown.

Distribution ( Fig. 123 ). Queensland.

Etymology. The name tuberculifrons refers to the anteromedian tubercle on the frons of males.

Remarks. This remarkable species can be easily identified on the basis of a slender body form, the median longitudinal groove on the pronotal disc, and the uniquely modified frons in males, bearing a distinct median tubercle between antennal insertions.

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.