Marcepania daifuku, Jałoszyński, 2020

Jałoszyński, Paweł, 2020, Three new species of Marcepania Jałoszyński (Coleoptera: Staphylinidae Scydmaeninae), Zootaxa 4852 (2), pp. 223-230 : 228-229

Marcepania daifuku sp. n.

( Figs 3 , 12–13 )

Type material. Holotype: THAILAND (Surat Thani Province): ♂, two labels: “THAILAND: 30m / Surat Thani Prov. / Ko Samui, Nam Tok / Na Muang For. Park / Schwendinger 5.1.92” [white, printed], “ MARCEPANIA / daifuku m. / P. Jałoszyński, 2020 / HOLOTYPUS ” [red, printed] ( MHNG).

Diagnosis. Body moderately stout, EI approximately 1.35, and small (BL clearly below 1 mm); head, prono- tum and elytra with dense but fine and inconspicuous punctures; aedeagus conspicuously stout, pear-shaped with broadly rounded apex; endophallus with a pair of diffuse, barely discernible elongate structures, parameres about as long as median lobe, each with one conspicuously short apical seta.

Description. Body of male ( Fig. 3 ) elongate and slender, moderately convex, light brown, covered with yellowish setae; BL 0.80 mm.

Head broadest at large, weakly convex, bean-shaped and coarsely faceted eyes, HL 0.08 mm, HW 0.18 mm; vertex and posterior region of frons confluent and only slightly convex; anterior portion of frons flattened; supraantennal tubercles barely marked; frons and vertex covered with dense but indistinct, fine, inconspicuous punctures; setae sparse and short, suberect. Antennae moderately long, AnL 0.38 mm; antennomeres 1–2 strongly elongate; 3 about as long as broad, 4–10 each weakly to distinctly transverse, 11 much shorter than 9–10, about 1.6 × as long as broad, with truncate apex.

Prothorax nearly semi-oval, broadest indistinctly behind middle; PL 0.25 mm, PW 0.30 mm. Anterior margin rounded; lateral margins strongly and nearly evenly rounded on entire length; hind corners nearly right-angled; posterior margin shallowly bisinuate; lateral ante-basal impressions small and shallow but with relatively sharp margins. Punctures on disc very dense, those near middle separated by spaces shorter than puncture diameters, but punctures are so small and shallow that entire surface appears matt; setae sparse, short, suberect.

Elytra together oval, broadest near anterior fourth; EL 0.48 mm, EW 0.35 mm, EI 1.36; apices broadly, sepa- rately rounded; punctures similar to those on pronotum but slightly more distinct, partly arranged into irregular longitudinal rows; setae short, sparse, suberect.

Legs short, robust; unmodified.

Aedeagus ( Figs 12–13 ) stout; AeL 0.09 mm; median lobe in ventral view pear-shaped with broadly rounded apex; endophallic structures weakly sclerotized and barely discernible, indistinctly demarcated from surrounding areas, with pair of elongate components; parameres about as long as median lobe, each with one conspicuously short apical seta.

Distribution. Ko Samui island off E coast of southern Thailand ( Fig. 14 ).

Etymology. The name daifuku (a noun in apposition) refers to the traditional Japanese sweet confection.

Remarks. The aedeagus of M. daifuku resembles that of M. elongata Jałoszyński, 2013 of Malaysia: Sabah; these are the only known Marcepania species with such stout median lobes. Marcepania daifuku has smaller adults (0.8 mm vs. 0.95 mm in M. elongata ), with antennal clubs less thickened and less distinctly delimited from proximal antennomeres; more distinctly transverse pronotum (which is nearly as long as broad in M. elongata ), and much stouter elytra (EI 1.36 in M. daifuku vs. 1.57 in M. elongata ). Marcepania daifuku is the first species of this genus found in Thailand.

Figures

FIGURE 14. Distribution of Marcepania species.

FIGURES 1–3. Dorsal habitus of Marcepania halva sp. n. (1), M. krowka sp. n. (2), and M. daifuku sp. n. (3).

FIGURES 8–13. Aedeagus in ventral view. Marcepania halva sp. n. (8–9), M. krowka sp. n. (10–11; one paramere broken off), and M. daifuku sp. n. (12–13; 12 includes also a fragment of abdominal segment, omitted in 13).