Penicillidmus maquilingensis, Jałoszyński, 2019

Jałoszyński, Paweł, 2019, Three new species of Penicillidmus in the Philippines (Coleoptera, Staphylinidae, Scydmaeninae), Zootaxa 4563 (1), pp. 185-190 : 186-187

Penicillidmus maquilingensis sp. n.

( Figs 1, 4–5 , 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 leaf litter" [white, printed], " PENICILLIDMUS / maquilingensis m. / P. Jałoszyński, 2018 / HOLOTYPUS " [red, printed] ( EUMJ).

Diagnosis. Male: BL ~ 1 mm; frons and vertex with punctures much more distinct than those on pronotum and elytra; pronotal base with only one pair of small and shallow pits connected by a distinct transverse groove; aedeagus with broadly subtriangular apex.

Description. Body of male ( Fig. 1 ) elongate but moderately slender, strongly convex, with short and robust appendages, BL 1.08 mm; cuticle glossy, pigmentation reddish-brown with elytra slightly darker than remaining body parts, vestiture of setae yellowish.

Head slightly flattened and transverse, broadest at eyes, HL 0.20 mm, HW 0.25 mm; tempora in dorsal view distinctly shorter than eyes; vertex weakly and evenly convex; frons confluent with vertex, weakly convex at middle and slightly flattened at eyes; supraantennal tubercles small and feebly elevated. Eyes large, weakly emarginate posteriorly, each composed of about 18 ommatidia, distinctly projecting laterally from the head silhouette. Punctures on vertex and frons distinct and dense, with sharply marked margins and separated by spaces subequal to diameters of punctures; setae short and dense, nearly recumbent. Antennae slender but short, AnL 0.45 mm; antennomere I about as long as broad, II distinctly elongate, III–VIII each indistinctly transverse, IX strongly transverse, much broader than VIII, X slightly transverse, distinctly broader and longer than IX, XI about as long as X but slightly narrower, about as long as broad.

Pronotum broadest near middle, PL 0.30 mm, PW 0.35 mm; anterior margin weakly arcuate, lateral margins rounded in anterior half, weakly angulate at 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 only one pair of small and shallow pits connected by a distinct transverse groove. Sides of pronotum lacking longitudinal carinae. Punctures on pronotal disc fine, superficial, inconspicuous; setae dense, longer than those on vertex and suberect.

Elytra oval, as convex as pronotum, broadest in front of middle, EL 0.58 mm, EW 0.50 mm, EI 1.15; basal impressions short; elytral apices separately rounded. Punctures on elytral disc more distinct than those on pronotum, nearly as dense as those on frons but superficial and diffuse; setae short, moderately dense and suberect, additionally sides of elytra with sparse, long and erect setae. Hind wings long, functional.

Legs moderately long and slender, unmodified.

Aedeagus ( Figs 4–5 ) moderately slender, AeL 0.13 mm; basal half nearly parallel-sided, apical third gradually narrowed distad, subtrapezoidal, with triangular, obtuse-angled apex; endophallus with a symmetrical pair of curved bunches of elongate sclerites in subapical region and a pair of rod-like structures in sub-basal area. Parameres slender, short, each with one long apical seta.

Female. Unknown.

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

Etymology. Locotypical, after Mt. Maquiling.

Remarks. The aedeagus of P. maquilingensis differs from that of all known congeners in a distinctly stouter median lobe, and especially its apical portion, which forms an obtuse apical angle, whereas it is sharp-angled in all remaining species.

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).