Protoconnus angustus, Jałoszyński, 2018

Jałoszyński, Paweł, 2018, Revision of the Neotropical genus Protoconnus Franz (Coleoptera: Staphylinidae: Scydmaeninae), Zootaxa 4392 (1), pp. 41-82 : 67-69

Protoconnus angustus sp. n.

( Figs 52 , 68–69 , 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 / angustus m. / P. JAŁOSZYŃSKI, 2018 / HOLOTYPUS" [red, printed] (cSBP). Paratypes (4 exx.): 3 ♂♂, same data as for the holotype; 1 ♂, " BOLIVIA: Cochabamba Dep. / Villa Tunari, Hotel El Puente, / S16°59.02', W65°24.50', 357m / 15-27.XII.2005, rainforest FIT / S.&J. Peck, 05-45" (cSBP, cPJ; all paratypes with standard yellow "Paratypus" labels).

Diagnosis. BL 0.88–0.93 mm; body slender, elytra 1.52–1.70 times as broad as indistinctly transverse pronotum; frons in male between supraantennal tubercles very narrow and impressed; 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 very broad basal capsule gradually narrowed distally, distal region broad, shorter than basal capsule and with subtriangular, pointed apex, distal region conspicuously broad in lateral view; parameres long and slender.

Description. Body of male ( Fig. 52 ) strongly convex, brown, covered with setae distinctly lighter than cuticle; BL 0.88–0.93 mm (mean 0.90 mm).

Head broadest at extremely large, strongly convex and coarsely faceted eyes, HL 0.13 mm, HW 0.19–0.20 mm (mean 0.20 mm); tempora absent; vertex weakly convex, posterior margin rounded; frons between large supraantennal tubercles very narrow and impressed. Punctures on frons and vertex inconspicuous; setae short, sparse and suberect. Antennae slender, AnL 0.39–0.40 mm (mean 0.40 mm), shorter than half BL, club distinctly delimited; antennomere I twice as long as broad, II about 1.5 × as long as broad, III–VIII each indistinctly transverse, IX and X each strongly transverse, XI much longer than X, as long as broad.

Pronotum indistinctly transverse, subtrapezoidal, broadest at base; PL 0.23–0.25 mm (mean 0.23 mm), PW 0.25–0.28 mm (mean 0.26 mm). Anterior and posterior margins weakly convex, lateral margins weakly rounded in anterior third and nearly straight in posterior half; 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 0.53–0.55 mm (mean 0.55 mm), EW 0.40–0.45 mm (mean 0.42 mm), EI 1.22–1.38; 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 68–69 ) relatively stout; AeL 0.15 mm; in ventral view basal capsule about as long as distal region, strongly narrowed distad; distal region laterally confluent with sides of basal capsule, broad, subtriangular, with pointed apex, in lateral view distal half very broad and indistinctly curved dorsad; in lateral view area above parameral bases lacking projection, weakly rounded; parameres conspicuously long, slender, each with one long apical and one short subapical seta.

Female unknown.

Distribution. Central Bolivia ( Fig. 101 ).

Etymology. The name angustus (Latin "narrow") refers to the slender body.

Remarks. Protoconnus angustus can be easily identified on the basis of its unusually slender body and the shape of the aedeagus, which is very broad at base, its distal region is gradually narrowed toward subtriangular and pointed apex and unusually broad in lateral view.

Figures

FIGURE 101. Distribution of nominal Protoconnus species.

FIGURES 48–53. Dorsal habitus of Protoconnus species. Protoconnus quillabambanus sp. n. (48); P. ecuadoranus sp. n. (49); P. napoanus sp. n. (50); P. impressifrons sp. n. (51); P. angustus sp. n. (52); P. maximus sp. n. (53).

FIGURES 68–75. Aedeagi of Protoconnus species. Protoconnus angustus sp. n. (68–69); P. maximus sp. n. (70–71); P. acutus sp. n. (72–73); P. minusculus sp. n. (74–75).