Horaeomorphus calcarifer (Franz) Franz, 2012

Jałoszyński, Paweł, 2012, Taxonomic status of Allohoraeomorphus Franz (Coleoptera, Staphylinidae, Scydmaeninae), Zootaxa 3313, pp. 62-68 : 64-67

Horaeomorphus calcarifer (Franz) comb. n.

( Figs. 1–3, 6–8 )

Allohoraeomorphus calcarifer Franz, 1986a: 164 .

Type material studied. Paratype: FIJI: 3, Viti Levu, Nandarivatu, 1000 m, 17 X 1977, leg. G. Kuschel ( NHMW).

Revised diagnosis. This species differs from all congeners in strongly convex pronotum and elytra; very dark brown pigmentation of pronotum and elytra and distinctly lighter head and appendages; distinctly darkened antennomeres III–VII; lack of lateral pits on frons; finely punctate head and pronotum, contrasting with large punctures on elytra; metatrochanters of males with pointed projection exceeding half length of femur; and central complex of aedeagus with distinct, basally located vesicular part.

Redescription. Body length 2.90 mm. Body of male ( Fig. 1) strongly convex; cuticle glossy; pronotum and elytra very dark brown, nearly pitchy-black, head slightly but distinctly lighter, appendages yet lighter, except for distinctly darkened antennomeres III–VI, maxillary palps light brown, nearly yellowish; vestiture moderately light brown.

Head broadest at small, finely faceted and moderately convex eyes, length 0.53 mm, width 0.63 mm; tempora in dorsal view arcuate, in lateral view twice as long as eye; vertex and frons confluent and convex, without lateral pits; supraantennal tubercles distinct but weakly raised; clypeus convex. Punctures on head dorsum barely noticeable at magnification 40 ×; setae sparse, long, suberect to erect. Antennae slender and only slightly thickening apically, length 1.45 mm, antennomeres I–VII distinctly elongate, VIII–IX about as long as broad, X slightly transverse, XI much longer than X but distinctly shorter than IX–X together.

Pronotum in dorsal view nearly circular, strongly and evenly convex, broadest slightly anterior to middle; length 1.00 mm, width 0.93 mm; anterior and lateral margins confluent and evenly rounded; hind angles strongly obtuse; posterior margin weakly arcuate; base with five distinct circular pits (largest median pit and two pairs of smaller lateral pits). Disc with sparse and fine punctures barely noticeable at magnification 40 ×; setae sparse, long, erect.

Elytra in lateral view slightly more convex than pronotum, in dorsal view equally broad as pronotum, broadest near anterior third; length 1.38 mm, width 1.00 mm, elytral index (length/width) 1.38; humeral calli absent. Punctures moderately large and shallow but well-visible at magnification 40 ×, separated by spaces equal to or slightly wider than puncture diameters; setae distinctly thicker and longer than those on pronotum, erect. Hind wings absent.

Legs long and slender; metatrochanters strongly modified, as in Fig. 6 .

Aedeagus ( Figs. 7, 8 ) elongate, AeL 0.50 mm; endophallus in ventral view with large central complex of moderately darkly sclerotized structures, including basally located thick-walled vesicle and lateral pair of long sclerites; parameres slender, with several apical setae of various length.

Distribution. Fiji, Viti Levu Island.

Figures

FIGURE 6. Right coxa, trochanter and femur of Horaeomorphus calcarifer comb. n. in ventral view. Abbreviations: tr — trochanter. Scale bar: 0.25 mm.

FIGURES 7 – 8. Aedeagus of Horaeomorphus calcarifer comb. n. in ventral (7) and lateral (8) views. Scale bar: 0.2 mm.