Eucibdelus flavipennis He, Schillhammer & Li, 2021

He, Liang, Schillhammer, Harald, Cai, Yanpeng & Li, Xiaoyan, 2021, A new species of the genus Eucibdelus Kraatz, 1859 (Coleoptera: Staphylinidae: Staphylininae) from Yunnan, China, Zootaxa 4969 (3), pp. 594-600 : 595-599

Eucibdelus flavipennis He, Schillhammer & Li , sp. nov.

( Figs 1 , 2 , 3 )

Type material. Holotype ♂: CHINA: Yunnan: Dali prefecture, Dali City, Yinqiao Town , Panqu Village , 25.72653N, 100.11113E, 2156m, light traps, 08-VII.2019, coll. Hu Li ( IZ-CAS) ; Paratypes, 2 ♂♂; CHINA: Yunnan: same data as holotype ( IZ-CAS) ; 24 ♂♂, 21 ♀♀: CHINA: Yunnan: 18 km SW Baoshan , 2100 m, 16.–19.V.2003, leg. S. Murzin (35 CSHUB, 10 NMW) ; 2 ♂♂, 4 ♀♀: CHINA: Yunnan: Weishan mt. , 1800-2500 m, 25.10N 100.21E, 22.–25.VI.1992, leg. V. Kubáň (6 NMB, 1 NMW) .

Measurements (holotype in brackets) in mm. Body length: 15.5–20.4; 8.3–11.7, abdomen excluded. CL: 0.9–1.2 (1.00); EL: 3.90–5.40 (5.29); ELS: 2.50–3.40 (3.12); EW: 3.80–5.00 (4.72); HL: 2.40–3.40 (3.35); HW: 2.45–2.55 (3.31); PO: 1.10–1.60 (1.48); PL: 2.25–3.15 (2.99); PW: 1.85–2.65 (2.65).

Description. Slender, large sized species, larger than most other species of the genus. Head and pronotum black brown to dark brown, rarely reddish brown, in places with slightly brassy sheen; elytra reddish-brown to yellowish brown, markedly paler than head and pronotum, with weakly developed and variably extended dark brown patches; elytral pubescence silvery, or dark reddish brown on dark patches of integument; abdomen black, with paratergites yellowish brown and posterior margins of each tergite narrowly reddish brown; visible tergites 1–4 with silvery to pale golden pubescence along midline and basally laterad of accessory lines; almost entire surface of visible tergites 5 and 6 pubescent; maxillary and labial palpi dark brunneous; antennae dark brown with proximal two or three segments somewhat paler; legs dark brown, with proximal half of femora usually distinctly darker, almost black.

Head slightly trapezoid to rounded quadrangular, widest at eyes, tempora gradually narrowed posteriad, almost parallel in female, with obtusely rounded posterior angles, nearly straight at base, almost as long as wide to inconspicuously wider than long (ratio 1.01–1.04).

Eyes large and strongly protruding, distinctly shorter than tempora (ratio 0.68–0.86) in dorsal view. Punctation on dorsal surface of head very dense, coarse, punctural grooves becoming larger, more oblong and with strigose interspaces in anterior half; impunctate midline usually indicated as a short shiny area. Head disc with 5 pairs of macrosetae, distributed as in Fig. 2A . Antennae moderately long, first 5 segments distinctly longer than wide; segments 6 to 10 distinctly dilated apicad, gradually becoming shorter towards apex; last segment subfusiform. Labrum short, nearly one-seventh as long as head disk, deeply excised medially, very sparsely punctured, with each half bearing about 12 long setae along anterior margin. Mandibles long, exceeding two thirds of head length; apical portion elongate, with sharp apex. Maxillary palpi as in Fig. 2B ; segment 2 bearing few long setae, mostly distributed along inner side; segment 3 also bearing few long setae, mostly distributed near apical margin surrounding the basal part of segment 4; segment 4 subfusiform and elongate, asetose. Labial palpi as in Fig. 2C ; segment 1 subclavate, bearing few long setae; segment 2 also subclavate, slightly dilated apicad, bearing many long setae along inner side, setae near apical portion extremely long; segment 3 subfusiform and elongate, bearing only few short setae.

Pronotum ( Fig. 2A ) slender, distinctly longer than wide (ratio 1.13–1.21), distinctly narrower than head (ratio 0.72–0.80), widest at anterior third, gradually narrowed posteriad in concave arc, hind angles rounded but well discernible; punctation and pubescence almost as in posterior half of head; impunctate midline only vaguely present in posterior third of pronotal length; surface slightly elevated in posterior third of midline; chaetotaxy consists of 4 pairs of macrosetae, as in Fig. 2A ; scutellum finely punctate and setose on entire surface. Elytra long and wide, quite distinctly dilated posteriad; elytral length vaguely longer along suture (ratio 1.04–1.11), considerably longer (ratio 1.66–1.77) along sides than pronotum along midline; surface slightly uneven, suture usually elevated immediately behind scutellum and with shallow depression lateral of elevated sutural portion; punctation exceedingly fine and dense, hardly visible on slightly granulose surface; pubescence very short; chaetotaxy of macrosetae as in Fig. 2A ; distribution of macrosetae on elytra not strictly symmetrical; parascutellar macroseta under-developed, about at midlevel of scutellum; humeral macroseta fully developed, accompanied with an additional seta; mid-lateral macroseta and posterolateral macroseta fully developed. Wings fully developed.

Abdomen elongate, almost parallel-sided; visible tergites 1–4 with pair of shallow medio-basal depressions between weakly indicated accessory lines; posterior margin of visible tergite 5 with very broad seam of palisade setae; visible tergite 6 (tergite VIII) with apex almost truncate, feebly emarginate at middle.

Male. Sternite VIII with wide and deep, rounded medioapical emargination ( Fig. 3H ). Sternite IX with rather shallow, rounded, medioapical emargination, asymmetrical basal portion quite short; apical half very densely setose ( Fig. 3G ). Tergite X moderately elongate, narrowed toward obtuse-angled apex in almost straight line, sparsely setose ( Fig. 3E ). Aedeagus elongate, shaped as in Figs 1B, D, E , 3 B−D; apical portion of median lobe elongate, with a tongue shaped projection on the left side of apical margin in ventral view ( Figs 1C , 3F ) pointing toward paramere; paramere also elongate, reaching apex of median lobe; sensory peg setae numerous, arranged in a dense cluster in apical portion of paramere ( Fig. 3A ).

Distribution. The species is at present known from the type locality in Dali as well as from two localities south and southwest of Dali, all of them in Yunnan province, China.

Diagnosis. Eucibdelus flavipennis belongs to the species related to E. varius Fauvel, 1895 and E. orientalis Hayashi, 1997 . The new species differs from both in the almost non-existent impunctate midline of the pronotum, a more densely punctate and less shiny anterior portion of the head, much shorter and hardly variegated elytral pubescence on much paler elytral integument, and the paramere of the aedeagus, which is as long as the median lobe.

Note. A paper dealing with all species related to the above ones is in preparation by the second author. It will provide comparative illustrations, photographs and (re-)descriptions of the known species and a number of new species.

Etymology. The species epithet is an adjective combined from the Latin words flavus (yellow) and penna (wing) and refers to the pale integument of the elytra.

Figures

FIGURE 1. Eucibdelus flavipennis, morphology; A) habitus, dorsal view; B) aedeagus, ventral view; C) apical portion of median lobe, ventral view; D, E) aedeagus, lateral view. Scale bars: 5.00 mm (A); 0.50 mm (B−E).

FIGURE 2. Eucibdelus flavipennis, morphology; A) fore body, dorsal view (PG = postgenal macroseta, O = occipital macroseta, H = humeral macroseta, PS = parascutellar macroseta, ML = mid-lateral macroseta, PL = postero-lateral macroseta); B) right maxillary palpus, ventral view; C) right labial palpus, ventral view. Scale bars: 3.00 mm (A); 0.25 mm (B, C).

FIGURE 3. Eucibdelus flavipennis, morphology; A) underside of apical portion of paramere; B, D) aedeagus, lateral view; C) aedeagus, ventral view; E) male tergite 10; F) apical portion of median lobe, ventral view, paramere removed; G) male sternite 9; H) male sternite 8. Scale bars: 0.50 mm.