Stenichnodes (s. str.) cordicollis, Jałoszyński, 2020

Jałoszyński, Paweł, 2020, Three new species and new records of Stenichnodes Franz (Coleoptera Staphylinidae: Scydmaeninae), Zootaxa 4779 (2), pp. 289-296: 290

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Stenichnodes (s. str.) cordicollis

sp. n.

Stenichnodes (s. str.) cordicollis   sp. n.

( Figs 1 View FIGURES 1–6 , 7–10 View FIGURES 7–14 )

Type material. Holotype: IVORY COAST: ♂, two labels: “IVORY COAST Tai / Forêt de Tai 17.X.80 / tamisage ss. bambous / Mahnert - Perret» [white, printed], « STENICHNODES   (s. str.) / cordicollis   m. / P. Jałoszyński, 2020 / HOLOTYPUS ” [red, printed] ( MHNG).  

Diagnosis. Elytral apex in male unmodified; protarsomere I in male with short anteroventral projection and slightly curved; antennae conspicuously slender, antennomeres IX and X each about as long as broad; aedeagus with asymmetrical parameres, of which one is bifurcate.

Description. Body of male ( Fig. 1 View FIGURES 1–6 ) elongate and slender, strongly convex, moderately dark brown, covered with yellowish vestiture; BL 1.01 mm.

Head broadest at large, strongly convex and finely faceted eyes, HL 0.16 mm, HW 0.20 mm; tempora slightly shorter than half length of eye in lateral view; vertex weakly convex and anteriorly confluent with frons; frons flattened, between indistinct supraantennal tubercles with a pair of tiny and diffuse round impressions. Each eye beanshaped, transverse in relation to the long body axis, with narrow posteromedian emargination. Vertex and frons with fine, inconspicuous punctures; setae fine, nearly recumbent, barely discernible under magnification 100 ×. Antennae conspicuously slender, with slightly flattened, trimerous club, AnL 0.43 mm; antennomeres I–II strongly elongate, III slightly transverse, IV–VIII each indistinctly elongate, IX–X each about as long as broad, XI about 1.2 × as long as broad, much shorter than IX and X combined, with rounded apex.

Pronotum heart-shaped, broadest near anterior third; PL 0.28 mm, PW 0.25 mm. Anterior and posterior margins weakly rounded, sides in anterior half strongly rounded; posteriorly distinctly constricted; base with shallow but distinct transverse groove deepened at middle to form diffuse pit. Punctures on pronotal disc inconspicuous, fine and sparse; setae sparse, short and recumbent, with a few erect setae on sides near each hind corner.

Elytra together oval, broadest distinctly behind middle; EL 0.58 mm, EW 0.43 mm, EI 1.35; humeral calli indistinct, basal impressions absent; apices rounded together. Punctures on elytra slightly more distinct than those on pronotum, but superficial and inconspicuous; setae sparse, short, suberect.

Hind wings absent.

Legs long and slender; protarsi modified, with tarsomere I slightly curved (dorsally convex) and with short anteroventral projection.

Aedeagus ( Figs 7–10 View FIGURES 7–14 ) elongate and with thick walls, in ventral view median lobe asymmetrical, especially in apical region, with long and flat apical projection; parameres present, massive and asymmetrical, one bifurcate, with asymmetrical branches, one bearing two setae, the other one asetose; AeL 0.28.

Female. Unknown.

Distribution. Southwestern Ivory Coast.

Etymology. The adjective cordicollis   refers to the heart-shaped pronotum.

Remarks. Stenichnodes cordicollis   is highly unusual in having the aedeagus with strongly modified, asym- metrical parameres, of which one is bifurcate, with one branch broadening distad and bearing apical setae, and the other tapering and lacking setae. Bifurcate parameres were not known in Scydmaeninae   , and they are rarely found among Staphylinidae   (examples can be found among Euaesthetinae   , e.g., Puthz (2008)).


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