Cephennodes (Cephennodes) hystrix, 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 : 419-421

Cephennodes (Cephennodes) hystrix sp. n.

( Figs 5–6 , 16–17 )

Type material. Holotype: CHINA (ZHEJIANG Prov.): ♂, two labels: "China:Zhejiang Prov. / Lishui City / Qingyuan County / Baishanzu / alt. 1500m / 22-23-IX-2008 / TANG & ZHANG leg." [white, printed]; " CEPHENNODES (s. str.) / hystrix m. / det. P. Jałoszyński, 2015 / HOLOTYPUS" [red, printed] (SNUC).

Diagnosis. Antennae distinctly longer than elytra, all antennomeres elongate, antennomeres III–VI each three times or more as long as broad; elytra with apical adsutural flattening, each elytron with long lateral bunch of setae (penicillus) in subapical region; median lobe of aedeagus with long median emargination in ventral apical margin of capsular part.

Description. Body of male ( Fig. 5 ) strongly convex, oval, with shallow constriction between pronotum and elytra, brown with slightly lighter legs and distinctly lighter palps, covered with light brown vestiture. BL 1.63 mm.

Head broadest at moderately large but strongly convex and coarsely faceted eyes, HL 0.23 mm, HW 0.38 mm; vertex weakly and evenly convex and anteriorly confluent with frons; frons flattened. Punctures on anterior portion of vertex, on frons and clypeus distinct and sharply marked, dense, punctures separated by spaces distinctly shorter than their diameters; setae short, sparse and suberect. Antennae very long, longer than elytra, AnL 1.13 mm, all antennomeres elongate, III–VII each three times or more as long as broad, XI distinctly shorter than IX–X together.

Pronotum semi-oval, strongly convex at middle and weakly flattened near hind corners, broadest near middle but barely discernibly narrowing posteriorly; PL 0.53 mm, PW 0.63 mm. Anterior margin in strictly dorsal view slightly arcuate; lateral margins strongly rounded in anterior half and nearly straight in posterior third; posterior pronotal corners nearly right-angled; posterior margin shallowly bisinuate; lateral marginal carinae very narrow and demarcated from disc in posterior 3/4 (but distinctly only in posterior half); lateral antebasal pits shallow but distinct, each located closer to lateral than to posterior pronotal margin. Punctures on median part of pronotal disc small but distinct, deep and with sharp margins, separated by spaces shorter than their diameters; punctures toward anterior and posterior pronotal margins reducing in size and depth, those near posterior margin are sparser, those near anterior margin slightly denser than those at middle, narrow area along posterior margin impunctate, anterolateral punctures becoming gradually larger, denser and deeper, so that a large area adjacent to each anterior corner is covered with coarse punctures separated by narrow wrinkles. Setae on pronotal disc long and moderately dense, suberect, additionally pronotum with four pairs of longer and more erect setae: one submedially near anterior pronotal margin, one near middle of lateral margin, one near posterior corner and one submedially near posterior margin (only the latter visible in Fig. 5 ).

Elytra about as convex as pronotum and distinctly broader, oval, broadest between middle and anterior third; EL 0.88 mm, EW 0.75 mm, EI 1.17; subhumeral lines carinate but moderately distinct, as long as 0.40× EL and divergent caudad; basal elytral fovea on each elytron located at middle between lateral margin of mesoscutellum and subhumeral line; elytral apices modified ( Fig. 6 ), with adsutural flattening and modified setae. Punctures on elytra shallow and fine but dense; setae distinctly longer than those on pronotum, moderately dense and suberect, additionally each elytron with sparse long and strongly erect setae in posterior third, and with lateral subapical penicillus composed of several very long setae directed posterolaterally and curved dorsally. Hind wings welldeveloped.

Metaventrite lacking lateral impressions, convex.

Legs long and slender; all tibiae nearly straight.

Aedeagus ( Figs 16–17 ) latus form, AeL 0.50 mm; median lobe in ventral view elongate, broadest near base and gradually narrowing distally; capsular part of median lobe with deep and narrow emargination of ventral apical margin; apical projections short, in lateral view dorsal apical projection slightly curved dorsally; parameres moderately broad, each with two robust apical setae.

Female. Unknown.

Distribution. SE China: Zhejiang Province.

Etymology. The specific epithet hystrix (Latinized Greek ϋστριζ, a porcupine) refers to the long setae directed posterodorsally on the posterior half of elytra, resembling a porcupine's quills.

Remarks. The slender body, strikingly elongated antennae and unique modifications of elytra are sufficient to distinguish this species from all similar congeners. Additionally, the median lobe of aedeagus with abruptly and deeply emarginated ventral apical margin of the capsular part can be found only in C. longipes Jałoszyński, 2007a , C. nematocerus Jałoszyński, 2007b and C. yinziweii sp. n. described below. Only in the latter species the emargination is similarly deep as that in C. hystrix ; in C. longipes the emargination is subquadrate and in C. nematocerus nearly semicircular, in both cases much shallower than that in C. hystrix . Cephennodes hystrix and C. yinziweii differ clearly in external characters, including the body shape, length or antennae, proportions of antennomeres and the subapical region of the elytra. Interestingly, C. hystrix has the aedeagus most similar to that of C. guizhouanus Jałoszyński, 2012b , a species known to occur in Guihzhou Province of China. Major difference is lack of the deep emargination in the aedeagus of the latter species; externally C. hystrix and C. guizhouanus differ profoundly in nearly all structures.

Figures

FIGURES 5 – 8. Dorsal habitus of males (5, 7, 8) and elytral apex of male in posterodorsal view (6). Cephennodes (s. str.) hystrix sp. n. (5 – 6); Cephennodes (s. str.) setifer sp. n. (7); Cephennodes (s. str.) yinziweii sp. n. (8).

FIGURES 16 – 25. Aedeagus in ventral (16, 18, 20) and lateral (17, 19, 21) views. Cephennodes (s. str.) hystrix sp. n. (16 – 17); Cephennodes (s. str.) setifer sp. n. (18 – 19); Cephennodes (s. str.) yinziweii sp. n. (20 – 21); Cephennodes (s. str.) datianpingensis sp. n. (22 – 23); Cephennodes (s. str.) bicribratus sp. n. (24 – 25).