Cephennomicrus lordhowei (Franz)

Jałoszyński, Paweł, 2018, Revision of Cephennomicrus of Australia (Coleoptera, Staphylinidae, Scydmaeninae), Zootaxa 4422 (2), pp. 151-183 : 175-177

Cephennomicrus lordhowei (Franz)

( Figs 103–107 , 121–123 )

Neseuthia lord howei Franz, 1975: 307 , fig. 285.

Cephennomicrus lordhowei (Franz) ; Jałoszyński, 2008: 33.

Type material. Holotype: AUSTRALIA ( LORD HOWE ISLAND): ♂, six labels: "Lord Howe L. / A. M. Lea" [bluish, printed], " Neseuthia / lord-howei m. / det.H.Franz" [white, handwritten and printed], " Type " [red, handwritten], " SAMA Database / No. 25-037044" [white, printed], " SAMA Digital Image / 27.8. 2013 " [green, printed and handwritten], " CEPHENNOMICRUS / lordhowei / ( Franz, 1975) / det. P. Jałoszyński, '18 / HOLOTYPUS " [white, printed] ( SAM). Paratype: 1 ♀, three labels: "On Kentia / Lord Howe I. / A. M. Lea" [bluish, printed], " Neseuthia / lord-howei m. / PARATYPUS " [yellowish, handwritten and printed], "Belongs to / S. A. Museum" [red, printed] ( NHMW).

Additional material studied. 1 ♀, Lord Howe Island , summit of Dawson Point Ridge, 5 Nov. 1979, berlesate of volcanic soil, G.B. Monteith leg. ( ANIC) ; 1 ♀, Lord Howe Island , track to Mutton Bird Point, 12 Nov. 1979, berlesate of volcanic soil, G.B. Monteith leg. ( ANIC) .

Emended diagnosis. BL 0.95–0.98 mm; body slender, EI 1.28; antennomeres III–X each about as long as broad; antennal club trimerous and indistinctly delimited; inner pair of pronotal antebasal pits connected by distinct shallow groove; frons in males unmodified; aedeagus stout, in ventral view with lateral margins of distal half bisinuate, endophallus with straight median flagellum flanked by two small bunches of needle-like sclerites.

Redescription. Body of male ( Fig. 103 ) slender and moderately convex, uniformly light to dark reddish brown; setae on head, pronotum and elytra moderately short and nearly recumbent, well-visible at magnification 40 ×. BL 0.95 mm.

Head broadest at large, strongly convex and coarsely faceted eyes, HL 0.08 mm, HW 0.23 mm; vertex and frons unmodified, confluent, weakly and evenly convex; supraantennal tubercles weakly elevated. Punctures on head dorsum fine and inconspicuous. Antennae slender, with indistinctly delimited trimerous club, AnL 0.45 mm, antennomeres I–II elongate, III–X about as long as broad, XI about as long as IX and X combined, about twice as long as broad.

Pronotum subtrapezoidal, broadest near anterior fourth; PL 0.30 mm, PW 0.35 mm; anterior and posterior margins weakly arcuate, sides rounded in anterior third and indistinctly concave in posterior half; anterior corners broadly rounded, posterior corners weakly obtuse-angled; base with two lateral pairs of small but distinct pits, inner pair connected by a shallow but distinct transverse groove; lateral pronotal carinae not serrate. Punctures on pronotal disc dense but superficial, diffuse and inconspicuous.

Elytra oval, broadest slightly anterior to middle; EL 0.58 mm, EW 0.45 mm, EI 1.28; humeral calli distinct; apices separately rounded. Punctures on elytra similar to those on pronotum.

Legs moderately long and slender, unmodified.

Aedeagus ( Figs 103–107 ) moderately elongate; AeL 0.24 mm; median lobe in ventral view drop-shaped with sides in distal half bisinuate, endophallus with paired and relatively simple elongate sclerites flanking simple, nearly straight flagellum; each paramere with one long and one short apical and one short subapical seta.

Female. Externally indistinguishable from male. BL 0.95–0.98 mm (mean 0.96 mm); HL 0 10 mm, HW 0.23– 0.24 mm (mean 0.23 mm), AnL 0.45–0.48 mm (mean 0.46 mm); PL 0.28–0.30 mm (mean 0.28 mm), PW 0.34– 0.35 mm (mean 0.34 mm); EL 0.58 mm, EW 0.45 mm, EI 1.28.

Distribution ( Fig. 123 ). Lord Howe Island.

Remarks. This is the only species of Cephennomicrus known to occur on Lord Howe Island; it can easily be distinguished from its congeners on the basis of slender body with relatively long setae, which on the elytra are directed posterolaterad, the unmodified head in males and unique shape and structures of the aedeagus.

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 103–112. Cephennomicrus lordhowei (Franz) (103–107) and C. mossmanensis sp. n. (108–112). Dorsal habitus (103, 108); aedeagus in ventral (104, 106, 109, 111) and lateral (105, 107, 110, 112) views.

FIGURES 118–122. Historical labels of type specimens. Cephennomicrus inconspicuus (King), lectotype (118) and paralectotype (119); C. perthi (Franz), holotype (120); C. lordhowei (Franz), holotype (121) and paratype (122).