Marcepania krowka, Jałoszyński, 2020

Jałoszyński, Paweł, 2020, Three new species of Marcepania Jałoszyński (Coleoptera: Staphylinidae Scydmaeninae), Zootaxa 4852 (2), pp. 223-230 : 227-228

Marcepania krowka sp. n.

( Figs 2 , 10–11 )

Type material. Holotype: INDONESIA (West Sumatra Province): ♂, two labels: “ SUMATRA: W Sum. #19 / Anai V. Nat. Res. / 10 km W Padangpanjan / 200 m, 17.XI.1989, / Löbl, Agosti, Burckhardt” [white, printed], “ MARCEPANIA / krowka m. / P. Jałoszyński, 2020 / HOLOTYPUS ” [red, printed] ( MHNG) . Paratype: 1 ♀, same data as for holotype ( MHNG) .

Diagnosis. Body relatively stout, EI approximately 1.35, and small (BL clearly below 1 mm); head, pronotum and elytra with distinct, dense punctures; aedeagus elongate and subtriangular with narrowly rounded apex; endo- phallus with a pair of diffuse, barely discernible elongate structures, parameres slightly longer than median lobe, each with one short apical seta.

Description. Body of male ( Fig. 2 ) elongate and slender, moderately convex, light brown, covered with light grey-brown setae; BL 0.80 mm.

Head broadest at large, weakly convex, bean-shaped and coarsely faceted eyes, HL 0.10 mm, HW 0.20 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 and distinct but shallow punctures; setae sparse and short, suberect. Antennae moderately long, AnL 0.35 mm; antennomeres 1–2 strongly elongate; 3–7 each about as long as broad, 8–10 each transverse, 11 much shorter than 9–10, about 1.4 × as long as broad, with truncate apex.

Prothorax nearly semi-oval, broadest near posterior third; PL 0.35 mm, PW 0.43 mm. Anterior margin rounded; lateral margins strongly and nearly evenly rounded in anterior half, weakly rounded and weakly convergent posterad in posterior third; hind corners weakly obtuse-angled; posterior margin shallowly bisinuate; lateral ante-basal impressions small and shallow but with relatively sharp lateral margins. Punctures on disc distinct, relatively sharply marked and dense, those near middle separated by spaces slightly shorter than puncture diameters; setae sparse, short, suberect.

Elytra together oval, broadest near anterior third; EL 0.48 mm, EW 0.35 mm, EI 1.36; apices broadly, separately rounded; punctures similar to those on pronotum but denser, partly arranged into irregular longitudinal rows; setae short, sparse, suberect.

Legs short, robust; unmodified.

Aedeagus ( Figs 10–11 ) stout; AeL 0.10 mm; median lobe in ventral view elongate subtriangular with narrowly rounded apex; endophallic structures weakly sclerotized and barely discernible, indistinctly demarcated from surrounding areas, with pair of elongate components; parameres slightly longer than median lobe, each with one short apical seta.

Female. Externally indistinguishable from male. BL 0.80 mm; HL 0.08 mm, HW 0.19 mm, AnL 0.33 mm; PL 0.25 mm, PW 0.34 mm; EL 0.48 mm, EW 0.35 mm, EI 1.36.

Distribution. Western Sumatra ( Fig. 14 ).

Etymology. The name krowka (a noun in apposition) refers to the traditional Polish fudge, krówka (pronounced [‘krufka]).

Remarks. Marcepania krowka co-occurs with M. halva on Sumatra, but adults are distinctly smaller than those of the latter species ( Fig. 1 vs. 2). The aedeagus with the subtriangular median lobe with sides converging towards the apex from median area is unique for M. krowka , all remaining species have truncated or broadly rounded apices. Only in M. minutissima Jałoszyński, 2013 a short apical region is subtriangular, but sides are weakly converging towards apex from the sub-basal third and then are rapidly bent distomesad in subapical 1/6.

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).