Cephennomicrus basalis, Jałoszyński, 2018

Jałoszyński, Paweł, 2018, Revision of Cephennomicrus of Australia (Coleoptera, Staphylinidae, Scydmaeninae), Zootaxa 4422 (2), pp. 151-183 : 160-161

Cephennomicrus basalis sp. n.

( Figs 32–36 , 123 )

Type material. Holotype: AUSTRALIA (QUEENSLAND): ♂, two labels: "Mossman Bluff Track / 5-10km W Mossman,N.Qld. / 1-16 Jan 1989 / Monteith,Thompson& ANZES / Site 3, 480m, pitfall" [white, printed], " CEPHENNOMICRUS / basalis m. / P. Jałoszyński, '18 / HOLOTYPUS " [red, printed] (QM). Paratypes (7 ♂♂):

QUEENSLAND: 1 ♂, same data as for holotype except for 16-30 Dec 1988 and flight intercept trap ; 1 ♂, 17.06S 145.36E, Mt. Haig (GS1), 1150 m, 4-31 May 1995, FIT, P. Zborowski leg. ; 1 ♂, 17.28S 145.29E, Longlands Gap (BS1), 1150 m, 3 Jan.–4 Feb. 1995, FIT, P. Zborowski leg. ; 1 ♂, same data but 1 Dec. 1994 – 3 Jan. 1995 ; 1 ♂, 16.04S 145.28E, 1 km WNW Cape Tribulation (CT1), 28 Feb.–27 Mar. 1996, pitfall trap, P. Zborowski leg. ; 1 ♂, 17.155S, 145.46E, Upper Mulgrave River , rainforest, 75 m, 19 Jun. 1971, Berlesate, Taylor & Feehan leg. ; 1, 18.55S, 146.10E, Mt. Spec (S2), 880 m, 6 Dec. 1994 – 10 Jan. 1995, FIT, M. Cermak leg. (paratypes in QM, ANIC, cPJ)

Diagnosis. BL 0.73–0.80 mm; body stout, EI 1.13–1.20; antennomeres III–X each at least slightly transverse; antennal club dimerous, sharply delimited and strongly flattened; inner pair of pronotal antebasal pits not connected; frons in males unmodified, aedeagus slender, with small circular diaphragm located on base of median lobe and internally connected with a lentiform sclerotization.

Description. Body of male ( Fig. 32 ) stout, uniformly reddish brown; setae on head, pronotum and elytra very short, dense and recumbent, but discernible at magnification 40 ×. BL 0.73–0.80 mm (mean 0.76 mm).

Head broadest at large, strongly convex and coarsely faceted eyes, HL 0.08–0.10 mm (mean 0.09 mm), HW 0.20–0.21 mm (mean 0.20 mm); frons and vertex unmodified, confluent, evenly and weakly convex; supraantennal tubercles weakly elevated. Punctures fine and inconspicuous. Antennae short, with sharply delimited dimerous and strongly flattened club, AnL 0.30–0.31 mm (mean 0.31 mm), antennomeres I–II distinctly elongate, III–X transverse (III–IX weakly so, X strongly), XI about as long as broad.

Pronotum subtrapezoidal, broadest near anterior fourth; PL 0.23–0.25 mm (mean 0.24 mm), PW 0.30–0.34 mm (mean 0.32 mm); anterior margin arcuate, posterior margin nearly straight, anterior corners broadly rounded, sides rounded in anterior third and nearly straight 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 0.43–0.45 mm (mean 0.44 mm), EW 0.38–0.40 mm (mean 0.38 mm), EI 1.13–1.20; humeral calli distinct; apices separately rounded. Punctures similar to those on pronotal disc.

Legs moderately long and slender, unmodified.

Aedeagus ( Figs 33–36 ) strongly elongate; AeL 0.23 mm; median lobe in ventral view with very short and indistinctly delimited distal part with its distolateral corners broadly rounded, flagellum poorly visible, not coiled; each paramere with one short apical and one long subapical seta.

Female. Unknown.

Distribution ( Fig. 123 ). Queensland.

Etymology. The name basalis refers to the diaphragm of the aedeagus shifted to the base.

Remarks. This species is externally unremarkable and examination of the aedeagus is necessary for identification. This is the only Australian Cephennomicrus with the diaphragm shifted to the base of median lobe, with an internal lentiform sclerotization connected to the diaphragm and well-visible in ventral and lateral view.

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 32–41. Cephennomicrus basalis sp. n. (32–36) and C. proserpinensis sp. n. (37–41). Dorsal habitus (32, 37); aedeagus in ventral (33, 35, 38, 40) and lateral (34, 36, 39, 41) views.