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

Jałoszyński, Paweł, 2020, Three new species and new records of Stenichnodes Franz (Coleoptera Staphylinidae: Scydmaeninae), Zootaxa 4779 (2), pp. 289-296 : 291-292

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

( Figs 2–3 , 11–14 )

Type material. Holotype: IVORY COAST: ♂, two labels: «IVORY COAST Tai / Forêt de Tai 20.X.80 / tamis- age bois mort / Mahnert - Perret» [white, printed], « STENICHNODES (s. str.) / spinosus m. / P. Jałoszyński, 2020 / HOLOTYPUS » [red, printed] ( MHNG) . Paratype: 1 ♀, same data as for holotype ( MHNG) .

Diagnosis. Each elytron in male with long apical spine; protarsomere I in male unmodified; antennae relatively thick, antennomeres IX and X each slightly transverse; aedeagus with slender, rod-like parameres, of which one is distinctly longer than the other.

Description. Body of male ( Fig. 2 ) elongate and slender, strongly convex, light brown, covered with yellowish vestiture; BL 0.84 mm.

Head broadest at large, strongly convex and finely faceted eyes, HL 0.15 mm, HW 0.18 mm; tempora vestigial; vertex weakly convex and anteriorly confluent with frons; frons slightly flattened, supraantennal tubercles indistinct. Each eye bean-shaped, 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 relatively robust, with slightly flattened, trimerous clubs, AnL 0.35 mm; antennomeres I–II strongly elongate, III slightly transverse, IV–VII each about as long as broad, VIII–X each slightly transverse, 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 0.23 mm, PW 0.20 mm. Anterior and posterior margins weakly rounded, sides in anterior half strongly rounded; posteriorly weakly rounded, not constricted; base with shallow but distinct transverse groove indistinctly deepened at each end. Punctures on pronotal disc inconspicuous, fine and sparse; setae sparse, short and recumbent.

Elytra together oval, broadest distinctly in front of middle; EL 0.46 mm, EW 0.35 mm, EI 1.32; humeral calli distinct, elongate; basal impressions shallow but distinct; apices separately rounded, each with long spines ( Fig. 3 ). Punctures on elytra slightly more distinct than those on pronotum, but superficial and inconspicuous; setae sparse, short, suberect.

Hind wings present, long.

Legs long and slender, unmodified.

Aedeagus ( Figs 11–14 ) elongate and with relatively thin walls, in ventral view median lobe slightly asymmetrical, with a group of broad and short apical projections; parameres present, very slender, of unequal lengths, each with one apical seta; AeL 0.20.

Female. Externally similar to male, but with rounded elytral apices, lacking spines. BL 0.88 mm; HL 0.15 mm, HW 0.18 mm, AnL 0.33 mm; PL 0.23 mm, PW 0.23 mm; EL 0.50 mm, EW 0.35 mm, EI 1.43.

Distribution. Southwestern Ivory Coast.

Etymology. The adjective spinosus refers to the apical elytral projections in male.

Remarks. Stenichnodes spinosus differs from all congeners in the unusual male dimorphic character, the long spines on elytral apices.

Figures

FIGURES 1–6. Dorsal habitus (1−2, 4, 6) and elytral apices in male (3, 5). Stenichnodes cordicollis sp. n. (1); S. spinosus sp. n. (2−3); S. bouakensis sp. n. (4−5); S. ceylonensis (Franz), specimen from India (6).

FIGURES 7–14. Aedeagus in ventral (7, 9, 11, 13) and lateral (8, 10, 12, 14) views. Stenichnodes cordicollis sp. n. (7−10); S. spinosus sp. n. (11−14).