Paraneseuthia acehiana, Jałoszyński, 2020

Jałoszyński, Paweł, 2020, Four new Palaearctic, Australian and Oriental species of Paraneseuthia Franz (Coleoptera, Staphylinidae, Scydmaeninae), Zootaxa 4858 (2), pp. 231-240 : 238-239

Paraneseuthia acehiana sp. n.

( Figs 20–24 )

Type material. Holotype: INDONESIA (Aceh Province): ♂, two labels: “ SUMATRA: Aceh #25a / Mt Leuser NP, 300- / 500 m, Ketambe, 23- / 30.XI.1989, Löbl / Agosti, Burckhardt” [white, printed]; “ PARANESEUTHIA / acehiana m. / P. Jałoszyński, 2020 / HOLOTYPUS ” [red, printed] ( MHNG).

Diagnosis. Body small (BL ∼ 0.9 mm), stout, covered with long and suberect setae; eyes moderately large and convex; male head, protibia and metaventrite unmodified; aedeagus with symmetrical median lobe with broadly emarginate apex, one median apical projection, and a pair of lateral apical projections, in lateral view strongly bent ventrad, with circular diaphragm situated in sub-basal region.

Description. Body of male ( Fig. 20 ) stout and moderately strongly convex, light brown, setae yellowish; BL 0.93 mm.

Head broadest at moderately large and relatively strongly convex, coarsely faceted eyes, HL 0.13 mm, HW 0.20 mm; vertex and frons confluent and flattened at middle, slightly impressed at sides; supraantennal tubercles indistinct. Punctures on vertex and frons inconspicuous, setae sparse, short and suberect. Antennae ( Fig. 20 ) short but slender, with distinctly delimited trimerous club, AnL 0.43 mm, antennomeres I–IV each elongate (III–IV weakly so), V–X each about as long as broad, XI indistinctly broader than X, much shorter than IX–X together, about 1.6 × long as broad.

Pronotum ( Fig. 20 ) nearly semicircular, with all margins rounded, broadest between middle and posterior third; PL 0.25 mm, PW 0.35 mm; posterior corners obtuse-angled and blunt, anterior corners not marked; pronotal base with barely discernible, tiny and diffuse median pit and two pairs of small but distinct lateral pits, of which the lateralmost pair is developed as elongate impressions. Punctures on pronotal disc fine and inconspicuous; setae moderately long and dense, suberect.

Elytra ( Fig. 20 ) together oval, broadest between middle and anterior third and weakly narrowing posterad, evenly, moderately strongly convex; EL 0.55 mm, EW 0.43 mm, EI 1.29; humeral calli distinct but small and short; basal impressions lacking; apices separately rounded. Punctures on elytra inconspicuous, small and diffuse; setae long, dense and suberect. Hind wings not studied.

Legs moderately long and slender; unmodified, mesotibiae weakly recurved.

Aedeagus ( Figs 21–24 ) stout, AeL 0.20 mm; median lobe in ventral view symmetrical; apex with deep and broad median emargination, elongate median projection protruding through ostium, and a pair of lateral projections, in lateral view strongly bent ventrad; diaphragm circular and situated in sub-basal region; parameres slender, each with 2 apical setae.

Female. Unknown.

Distribution. North-westernmost Sumatra.

Etymology. After the Indonesian province of Aceh.

Remarks. Paraneseuthia acehiana is externally unremarkable and examination of the aedeagus is necessary to identify this species. No other known species has the median lobe in lateral view with lateral apical projections forming slender hooks strongly bent ventrad; the entire apical region of the median lobe in this species is uniquely shaped.

Figures

FIGURES 20–24. Paraneseuthia acehiana sp. n., male. Dorsal habitus (20); aedeagus in ventral (21, 23) and lateral (22, 24) views.