Cephennodes (Cephennodes) impressibos, Jałoszyński, 2016

Jałoszyński, Paweł, 2016, The Cephenniini of China. VIII. New species and new records of Cephennodes Reitter of Hunan, Jiangxi, Zhejian and Fujian (Coleoptera: Staphylinidae: Scydmaeninae), Zootaxa 4079 (4), pp. 415-428 : 418-419

Cephennodes (Cephennodes) impressibos sp. n.

( Figs 3−4 , 14–15 )

Type material. Holotype: CHINA (JIANGXI Prov.): ♂, two labels: "China: Jiangxi, Pingxiang City / Wugong Shan National Park, / 27º27'55''N, 114º09'58''E" cab- / leway station to Biaoshui Wate / rfall, broad leaf, sifted, 1000-13 / 50 m, 20.vii.2013, Song, Yin, Yu" [white, printed]; " CEPHENNODES (s. str.) / impressibos m. / det. P. Jałoszyński, 2015 / HOLOTYPUS" [red, printed] (SNUC).

Diagnosis. Frons with broad median longitudinal line composed of loosely distributed fine punctures, lacking median tubercle, anterior portion of median line flanked by distinct impressions, their anterior margins raised and forming pair of lateral clypeal tubercles; projection of antennomere III longer than long and with particularly narrow apical portion; median lobe of aedeagus in ventral view drop-shaped, relatively slender and with subtriangular apex, apical hook-like projection in ventral view with subtriangular apical portion, in lateral view hook curved at slightly obtuse angle.

Description. Body of male ( Fig. 3 ) strongly convex, oval, with shallow constriction between pronotum and elytra, dark reddish-brown with slightly lighter legs and distinctly lighter palps, covered with light brown vestiture. BL 2.10 mm.

Head ( Fig. 4 ) broadest at moderately large but strongly convex and coarsely faceted eyes, HL 0.30 mm, HW 0.55 mm; vertex weakly and evenly convex and anteriorly confluent with frons; frons weakly convex, with distinct and broad median longitudinal line composed of fine and loosely assembled setiferous punctures; supraantennal tubercles distinct; clypeus thickened, elevated, with pair of lateral tubercles, frons behind each clypeal tubercle distinctly impressed. Punctures on vertex and frons ( Fig. 4 ) sharply marked, unevenly distributed and of various diameters, frons medially largely impunctate except for posterior portion and median line; setae on frons and vertex sparse, long and suberect. Antennae moderately long, AnL 1.13 mm, antennomeres I and II slightly broader than long, III distinctly elongate, with moderately long subtriangular mesodorsal projection slightly longer than length of antennomere, its apex strongly curved and rapidly narrowed, slender and pointed, antennomeres IV–VII each distinctly elongate (VII the longest), VIII about as long as broad, IX and X each slightly transverse, XI about twice as long as broad, distinctly broader than X, slightly longer than antennomeres IX–X together, with pointed apex.

Pronotum semi-oval, strongly convex at middle and slightly flattened near hind corners, broadest near middle; PL 0.68 mm, PW 0.95 mm. Anterior margin in strictly dorsal view slightly arcuate; lateral margins strongly rounded and indistinctly and unevenly microserrate, sides posteriorly slightly convergent toward slightly obtuseangled posterior pronotal corners; posterior margin deeply bisinuate; lateral marginal carinae narrow and indistinctly demarcated from disc only in posterior half; lateral antebasal pits shallow but distinct, each located slightly closer to posterior than to lateral pronotal margin. Punctures on median part of pronotal disc small but distinct, deep and with sharp margins, separated by spaces comparable to diameters of punctures; punctures toward anterior and posterior pronotal margins reduced in size and depth, those near posterior margin are also sparser, narrow area along posterior margin and lateral to each antebasal pit impunctate, anterolateral punctures becoming gradually larger, denser and deeper, so that very large area (as broad as nearly third of pronotum) adjacent to each anterior corner is covered with coarse punctures separated by narrow wrinkles, some punctures fused. Setae on pronotal disc long and moderately dense, erect.

Elytra slightly more convex and indistinctly narrower than pronotum, oval, broadest near anterior third; EL 1.13 mm, EW 0.95 mm, EI 1.18; subhumeral lines carinate, sharply marked, as long as 0.47× EL and distinctly divergent caudad; basal elytral fovea on each elytron located slightly closer to subhumeral line than to mesoscutellum; elytral apices unmodified, separately rounded. Punctures on elytra superficial but dense and sharply marked; setae distinctly longer than those on pronotum, dense and erect. Hind wings well-developed.

Metaventrite lacking lateral impressions, convex.

Legs moderately long and slender; all tibiae nearly straight.

Aedeagus ( Figs 14–15 ) simonis form, AeL 0.38 mm, median lobe in ventral view drop-shaped, relatively slender, with subtriangular apex; dorsal apical projection in ventral view with subtriangular apical portion, in lateral view hook-shaped, curved dorsally at obtuse angle; parameres long and slender, each with one apical and two subapical setae.

Female. Unknown.

Distribution. SE China: Jiangxi Province.

Etymology. The specific epithet impressibos reflects the similarity of this species to C. bos and also refers to the impressed frons behind clypeal tubercles.

Remarks. Besides modifications of the vertex, frons and clypeus and uniquely shaped projection of the antennomere III (much shorter and of clearly different shape than that in C. bos Jałoszyński & Nomura, 2009 , C. bubalus Jałoszyński & Nomura, 2009 , C. buceros Jałoszyński & Nomura, 2009 and C. pseudobos Jałoszyński, 2015a , and clearly longer than that in C. brachyspinosus ) C. impressibos has also conspicuously long setae on the dorsal wall of the aedeagus.

Figures

FIGURES 1 – 4. Dorsal habitus of males (1, 3) and head of male in dorsal view (2, 4). Cephennodes (s. str.) brachyspinosus sp. n. (1 – 2); Cephennodes (s. str.) impressibos sp. n. (3 – 4).

FIGURES 12 – 15. Aedeagus in ventral (12, 14) and lateral (13, 15) views. Cephennodes (s. str.) brachyspinosus sp. n. (12 – 13); Cephennodes (s. str.) impressibos sp. n. (14 – 15).