Cephennomicrus yunnanicus, Jałoszyński, 2019

Jałoszyński, Paweł, 2019, The Cephenniini of China. IX. Cephennomicrus Reitter of Yunnan (Coleoptera: Staphylinidae: Scydmaeninae), Zootaxa 4629 (2), pp. 280-286 : 281-283

Cephennomicrus yunnanicus sp. n.

(Figs 1–2, 4–6, 10–13)

Type material. Holotype: ♂, two labels: " CHINA: Yunnan, Wuding, Lion / Mountain Scenic Area , 2200 m, / 25°31'59''N, 102 v22 '36''E, stream / valley with deciduous forest, moist / litter sifted, 17.VIII.2014, / leg. M. Schül- ke [CH14-11]" [white, printed], " CEPHENNOMICRUS / yunnanicus m. / det. P. Jałoszyński, 2019 / HOLOTY- PUS" [red, printed] (cMS/ MNHUB). Paratypes (2 ♂♂): ♂, " CHINA: Yunnan, mountain NW / Wuding, 2190 m, 25°36'53''N, / 102°18'59''E, degraded mixed / forest with alder, oak, pine, litter, / fungi and dead wood sifted, / 17.VIII.2014, Schülke [ CH14-10 ]; ♂, " CHINA: Yunnan, Baoshan Pref. / mount. range 25 km S Tengchong , / 1900 m, 24°48'21''N, 98°32'05''E, / cleft with devast. primary forest, litter / & mushr. sifte, 30.VIII.2009, / leg. M. Schülke [ CH9-18 ]. Both paratypes with standard yellow " PARATYPUS " labels, deposited at cMS/ MNHUB and cPJ.

Diagnosis. BL> 1.00 mm; head in males unmodified; body with very short and recumbent pubescence, barely noticeable on elytra; punctures on pronotum much larger, deeper and denser than those on head and elytra, densely distributed; antenna with elongate and weakly broadened antennomere IX and strongly enlarged antennomeres X and XI; pronotal base with two pairs of pits, lacking transverse groove; aedeagus pear-shaped, with subtrapezoidal, truncate apical portion of median lobe, subtriangular ventral apical plate, symmetrical endophallus and broad para- meres.

Description. Body of male (Figs 1–2) moderately stout, strongly convex, dark umber brown; setae silverish; BL 1.10–1.14 mm.

Head (Fig. 4) broadest at large, strongly convex and coarsely faceted eyes; HL 0.13–0.15 mm, HW 0.28–0.30 mm; frons and vertex confluent, evenly and weakly convex, unmodified; supraantennal tubercles feebly elevated; clypeus unmodified. Punctures on frons and vertex distinct but small and shallow, with relatively sharp margins, moderately densely distributed; setae very short and recumbent, sparse, barely noticeable.Antennae (Fig. 6) slender, with distinctly delimited dimerous club, but antennomere IX enlarged in relation to antennomeres III–VIII, so the club can be also interpreted as trimerous, indistinctly delimited; AnL 0.50–0.53 mm, antennomeres I–II strongly elongate, III–IV each about as long as broad, V–VI each slightly elongate, VII–VIII each about as long as broad, IX slightly broader and much longer than VIII, distinctly elongate, X indistinctly transverse, much broader but only indistinctly longer than IX, XI distinctly broader and longer than X, shorter than IX–X combined, indistinctly longer than broad, with asymmetrical, rounded apex.

Pronotum (Fig. 5) rectangular and transverse, broadest near anterior fourth; PL 0.33–0.38 mm, PW 0.44–0.49 mm; anterior margin weakly arcuate; lateral margins microserrate, strongly rounded in anterior third and nearly straight in posterior half, where they are indistinctly converging posterad; posterior margin shallowly bisinuate at sides, with distinct shallow emargination in front of scutellum; base with two lateral pairs of distinct, deep circular pits, lacking transverse groove. Punctures on pronotal disc distinct, moderately large, deep and sharply marked, separated by spaces subequal to their diameters; setae longer than those on head, sparse, recumbent; additionally pronotum with two lateral pairs of macrosetae (one near anterior third and one near posterior corners).

Elytra (Figs 1–2) oval, broadest between anterior fourth and third; EL 0.65–0.68 mm, EW 0.53–0.56 mm, EI 1.18–1.24; humeral calli distinct; apices separately rounded. Punctures on elytra inconspicuous, very fine and superficial; setae very short, recumbent and sparse, barely noticeable; additionally each elytron with one lateral subhumeral macroseta (visible in Fig. 5).

Hind wings present, long.

Legs moderately long and slender, unmodified.

Aedeagus ( Figs 10–13 ) elongate, but not very slender; AeL 0.23 mm; median lobe in ventral view pear-shaped, with two distinct apical plates: short subtriangular ventral plate and long subtrapezoidal dorsal plate; ventral dia- phragm large, circular, sub-basal; endophallus with darkly sclerotized, elongate and symmetrical structures; param- eres broad and long, each with four tiny apical and subapical setae.

Female. Unknown.

Distribution. China: Yunnan.

Etymology. Locotypical, after Yunnan.

Remarks. The holotype (Fig. 1) and the paratype from Wuding are slightly more slender and smaller than the paratype from a mountain range near Tengchong (Fig. 2). However, the aedeagi of these specimens are almost iden- tical, with indistinct differences only in the shape of the dorsal apical plate. Also the punctures, setae and proportions of antennomeres do not differ, and I regard all specimens as belonging to one species.

Cephennomicrus yunnanicus differs clearly from two species previously known to occur in China in the ae- deagus (in C. fujianus with a strongly projecting, subtriangular apex, in C. japonigenus broadly subtriangular apex, vs. broadly truncate subtrapezoidal apex in C. yunnanicus ). There are no East Palaearctic species with a similar ae- deagus; a somewhat similar shape of the median lobe can be found in C. leyteanus Jałoszyński, 2009b ( Philippines) . The latter species differs in having very stout adults with numerous lateral and dorsal macrosetae on each elytron.

Figures

FIGURES 10–17. Cephennomicrus yunnanicus sp. n. (10–13) and C. andreasi sp. n. (14–17). Aedeagus in ventral (10, 12, 14, 16) and lateral (11, 13, 15, 17) views.