Penicillidmus luzonicus, Jałoszyński, 2019

Jałoszyński, Paweł, 2019, Three new species of Penicillidmus in the Philippines (Coleoptera, Staphylinidae, Scydmaeninae), Zootaxa 4563 (1), pp. 185-190 : 188-190

Penicillidmus luzonicus sp. n.

( Figs 3, 8 , 9 )

Material studied. Holotype: male ( PHILIPPINES, LAGUNA PROVINCE): three labels: "( PHILIPPINES) / Mt. Maquiling / alt. 400 m / Laguna Prov. / Luzon, 12. IX. / 1985, K. Ishikawa " [white, printed], "Tullgren sample / of fallen fruit / of Ficus sp." [white, printed], " PENICILLIDMUS / luzonicus m. / P. Jałoszyński, 2018 / HOLOTYPUS " [red, printed] ( EUMJ).

Diagnosis. Male: BL distinctly less than 1 mm; frons and vertex with punctures as inconspicuous as those on pronotum and elytra; pronotal base with one pair of large submedian and one pair of much smaller lateral pits not connected by groove; aedeagus with moderately narrow subtriangular apex.

Description. Body of male ( Fig. 3 ) elongate but moderately slender, strongly convex, with short and robust appendages, BL 0.75 mm; cuticle glossy, pigmentation uniformly light brown, vestiture of setae yellowish.

Head weakly and evenly convex, broadest at eyes, HL 0.15 mm, HW 0.18 mm; tempora in dorsal view indistinctly shorter than eyes; vertex and frons confluent and weakly, evenly convex; supraantennal tubercles small and feebly elevated. Eyes large, only indistinctly emarginate posteriorly, each composed of about 16 ommatidia, distinctly projecting laterally from the head silhouette. Punctures on vertex and frons dense but very shallow and diffuse, superficial and inconspicuous; setae short and dense, nearly recumbent. Antennae slender but short, AnL 0.24 mm; antennomere I about as long as broad, II distinctly elongate, III–X each transverse, XI indistinctly longer than X but slightly narrower, about as long as broad.

Pronotum broadest near middle, PL 0.23 mm, PW 0.23 mm; anterior margin weakly arcuate, lateral margins rounded in anterior half, weakly angulate at papillate insertions of lateral setal brushes and behind them nearly straight and distinctly convergent posteriorly; posterior pronotal corners obtuse-angled and blunt; posterior margin arcuate; base with two pairs of antebasal pits, of which submedian pits are large and lateral ones much smaller, transverse groove absent. Sides of pronotum lacking longitudinal carinae. Punctures on pronotal disc fine and inconspicuous; setae short, moderately dense, suberect.

Elytra oval, as convex as pronotum, broadest indistinctly in front of middle, EL 0.38 mm, EW 0.28 mm, EI 1.36; basal impressions short but deep; elytral apices separately rounded. Punctures on elytral disc fine and inconspicuous; setae short, moderately dense and suberect. Hind wings long, functional.

Legs moderately long and slender, unmodified.

Aedeagus ( Fig. 8 ) moderately slender, AeL 0.13 mm; median lobe drop-shaped, nearly parallel-sided in proximal half and rapidly narrowing distad in apical half, with its apical portion forming a triangular projection with sharp-angled apex; endophallus weakly sclerotized, with a symmetrical median elongate structure. Parameres broad and short, each with one long apical seta.

Female. Unknown.

Distribution ( Fig. 9 ). Philippines, southern Luzon, Laguna Province.

Etymology. Locotypical, after the island of Luzon.

Remarks. The aedeagus of P. luzonicus differs from that of all congeners in the subtrapezoidal and truncated ventral subapical plate; see remarks for P. lagunensis . The aedeagus of the holotype was studied and illustrated only in ventral view to avoid damage during manipulations; it is particularly weakly sclerotized and prone to distortions.

Figures

FIGURE 9. Distribution of nominal species of Penicillidmus.

FIGURES 1–8. Habitus of holotypes (1–3) and aedeagi in ventral (4, 6, 8) and lateral (5, 7) views of Penicillidmus maquilingensis sp. n. (1, 4–5), P. lagunensis sp. n. (2, 6–7) and P. luzonicus sp. n. (3, 8).