Protoconnus impressifrons, Jałoszyński, 2018

Jałoszyński, Paweł, 2018, Revision of the Neotropical genus Protoconnus Franz (Coleoptera: Staphylinidae: Scydmaeninae), Zootaxa 4392 (1), pp. 41-82: 66-67

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Protoconnus impressifrons

sp. n.

Protoconnus impressifrons   sp. n.

( Figs 51 View FIGURES 48–53 , 60–61 View FIGURES 54–61 , 101 View FIGURE 101 )

Type material. Holotype: BOLIVIA (Cochabamba Department): ♂, two labels: " BOLIVIA: Cochabamba Dep. / Est. Biol. Sacta, Univ. Mayor / S.Simeon, S17°06.48, W64°46.94, / 300m, 16-27.XII.2005, rainforest FIT / S.&J. Peck, 05-47" [white, printed], " PROTOCONNUS   / impressifrons   m. / P. JAŁOSZYŃSKI, 2018 / HOLOTYPUS" [red, printed] (cSBP). Paratype: 1 ♂, same data as for the holotype, with a standard yellow "Paratypus" label (cSBP).

Diagnosis. BL 0.83–0.85 mm; body stout, elytra 1.56–1.80 times as broad as strongly transverse pronotum; frons in male between large supraantennal tubercles developed as a narrow groove; vertex weakly convex, its posterior margin rounded; pronotal base with small but distinct pits and distinct groove; lateral pronotal carinae distinct in posterior half; humeral carinae distinct, rounded and broad anteriorly, distinctly narrowing posterad; aedeagus in ventral view with basal capsule very long, longer than half length of median lobe, gradually narrowed distally, and a slender distal region with a conspicuous subapical broadening and narrow, rod-like apex.

Description. Body of male ( Fig. 51 View FIGURES 48–53 ) strongly convex, brown, covered with setae distinctly lighter than cuticle; BL 0.83–0.85 mm.

Head broadest at extremely large, strongly convex and coarsely faceted eyes, HL 0.15 mm, HW 0.20 mm; tempora absent; vertex weakly convex, posterior margin rounded and indistinctly elevated; frons between large supraantennal tubercles very narrow and impressed. Punctures on frons and vertex inconspicuous; setae short, sparse and suberect. Antennae slender, AnL 0.40 mm, slightly shorter than half BL, club distinctly delimited; antennomere I twice as long as broad, II about 1.5 × as long as broad, III –IV and VI each slightly transverse, V, VII –VIII each about as long as broad, IX and X each strongly transverse, XI much longer than X, about 1.2 × as long as broad.

Pronotum moderately transverse, subtrapezoidal, broadest at base; PL 0.20–0.23 mm, PW 0.25–0.29 mm. Anterior and posterior margins weakly convex, lateral margins weakly rounded; lateral carinae distinct and sharp in posterior half; transverse antebasal groove and five pits distinct. Punctures on pronotal disc inconspicuous; setae sparse, short, suberect.

Elytra much more convex than pronotum, oval, broadest in front of middle; EL 0.48 mm, EW 0.45 mm, EI 1.06; humeral carinae distinct and long, anteriorly broad and rounded, posteriorly narrowing and sharply marked, although weakly elevated. Punctures and setae similar to those on pronotum.

Legs moderately long and slender, unmodified.

Aedeagus ( Figs 60–61 View FIGURES 54–61 ) slender; AeL 0.18 mm; in ventral view basal capsule slightly longer than distal region, strongly narrowed distad; distal region laterally confluent with sides of basal capsule, very slender, narrowed distad but with a large subapical broadening, in lateral view distal half strongly recurved; in lateral view area above parameral bases forming a very long, narrow projection, its tip reaching level of the subapical broadening of distal region; parameres strongly divergent distad, each with one long apical and one short subapical seta.

Female unknown.

Distribution. Central Bolivia ( Fig. 101 View FIGURE 101 ).

Etymology. The name impressifrons   refers to the narrow and impressed frons between supraantennal tubercles.

Remarks. No other species of Protoconnus   has an aedeagus with a distinct subapical broadening; this character allows for an easy identification of males of P. impressifrons   .