Rhyncocheilus huanghaoi Tang, Schillhammer & Zhao, 2021

Tang, Liang, Schillhammer, Harald & Zhao, Xin, 2021, Notes on the genus Rhyncocheilus in China (Coleoptera, Staphylinidae Staphylininae) with descriptions of three new species, Zootaxa 4948 (1), pp. 99-112 : 102-103

Rhyncocheilus huanghaoi Tang, Schillhammer & Zhao sp. n.

( Figs 3, 4 , 16–18 , 34–37)

Type material. Holotype. China: Xizang: ³, glued on a card with labels as follows: “ China : Xizang A. R., Motuo County, Hanmi-A’niqiao, alt. 1560 m, 10.VIII.2011, Bi Wen-Xuan leg.” “ Holotype / Rhyncocheilus huanghaoi / Tang, Schillhammer & Zhao” [red handwritten label] ( SHNU) . Paratypes. 1³, same data as for the holotype ( SHNU) ; 1³, Motuo County, A’niqiao, alt. 1060 m, 8.VIII.2011, Bi Wen-Xuan leg. ( NMW); 2♀♀, Motuo, Bari Vil., alt. 1200–1850 m, 27.VII.2014, Bi Wen-Xuan leg. ( SHNU); 1♀, Motuo, 1400–1800 m, 17.VIII.2013, Bi Wen-Xuan leg. ( SHNU); 1♀, Motuo, 1100 m, 19.VIII.2013, Bi Wen-Xuan leg. ( SHNU); 6♀♀, Motuo, A’niqiao, alt. 1100 m, 16–18.VIII.2005, Huang & Tang leg. ( SHNU, NMW) .

Description. Measurements of male: BL: 20.6–21.9 mm, FL: 12.0– 12.4 mm. HL: 2.61–2.67mm, HW: 3.28 mm, EYL: 1.06–1.11 mm, TL: 1.17–1.28 mm, PL: 2.72–2.89 mm, PW: 2.89–2.95 mm, EL: 5.12–5.34 mm, EW: 5.39–5.95 mm. HW/HL: 1.23–1.26, TL/EYL: 1.10–1.21, PL/PW: 0.94–1.00, EL/EW: 0.90–0.95.

Measurements of female: BL: 19.9–25.0 mm, FL: 13.0– 13.7 mm. HL: 2.89–3.06mm, HW: 3.61–3.84 mm, EYL: 1.11–1.17 mm, TL: 1.17–1.45 mm, PL: 3.00– 3.73 mm, PW: 3.22–3.45 mm, EL: 5.73–6.00 mm, EW: 5.84– 6.51 mm. HW/HL: 1.18–1.27 mm, TL/EYL: 1.05–1.30, PL/PW: 0.90–1.08, EL/EW: 0.90–0.98.

Head dorsally reddish with a small transverse dark patch on vertex and a large median dark patch in posterior third, postgena with pair of longitudinal dark patches on basal portion, labrum reddish, mandibles reddish with inner margins darkened, palpi reddish, antennae with basal seven antennomeres reddish, antennomeres 8–11 black, pronotum reddish with variable dark brown patches, anepisternum black in anterior half, mid coxal cavities blackish, elytra reddish, abdominal segments III–V predominantly blackish with lateral and posterior portions reddish, segment VI blackish, segment VII with basal 2/5 black and apical 3/5 reddish, remaining segments reddish, legs reddish except front tarsomeres darker.

Head subquadrate with lateral margins at tempora almost parallel, posterior margin concave at neck; surface without irregularities, slightly impressed at the dark black patches, punctation very dense with punctures similar in size, pubescence long and golden; labrum ( Fig. 18 ) densely golden setose; antennae long and slender, antennomeres 1–6 distinctly oblong, antennomere 3 shorter than scapus, antennomere 2 about as long as antennomere 4, antennomere 7 a little longer than wide, antennomeres 8 and 9 a little wider than long, antennomere 10 almost as long as wide, antennomere 11 longer than penultimate, antennomeres 7–10 slightly asymmetrical, antennomere 11 asymmetrical.

Pronotum trapezoid, widest at anterior angles, weakly narrowed toward base, almost parallel-sided, anterior margin distinctly emarginate in the middle; dorsal surface uneven with a pair of transverse impressions near anterior margin, a pair of oblique impressions near the middle of lateral margins and a pair of impressions in posterior half; surface with dense and golden pubescence, except a bold short portion on posterior half of the midline.

Elytra long with lateral margins distinctly divergent posteriad and joined posterior margin distinctly angulate, surface slightly uneven due to shallow depressions around sockets of macro-setae; punctation fine and dense, ground pubescence golden. Scutellum finely and densely punctate, with silvery pubescence in anterior third and a heart-shaped black tomentose patch in posterior two thirds.

Abdominal tergites III–VI each with a mediobasal depression laterally delimited by short strongly oblique ac- cessory lines; tergites III–V with golden pubescence except for large patch of black pubescence posteriad of basal depressions, tergite VI mostly with black pubescence except for silvery pubescence along midline and basal margin and two small silvery tomentose patches near lateral margins, tergite VII almost entirely with silvery pubescence except for pair of basal black tomentose patches near lateral margin and pair of admedian exposed dots, tergite VIII–X covered with golden pubescence; tergite X in both sexes triangular with round apex.

Male. Head ( Fig. 16 ) with posterior angle less prominent; sternites VII and VIII emarginate in the middle of posterior margin; aedeagus ( Figs 34, 35 ) slender, median lobe apically with large left facing tooth on ventral side ( Fig. 36 ); paramere longer than median lobe, apex roundly pointed, inner side of apical portion ( Fig. 37 ) densely covered with peg setae, subapical portion close to peg setae area with deep cavity to accommodate the large apical tooth of the median lobe.

Female. Head ( Fig. 17 ) with posterior angle more prominent; sternites VII and VIII with posterior margin en- tire.

Distribution. China (Xizang).

Diagnosis. The new species is similar to Rhyncocheilus rugulipennis Cameron, 1932 in general appearance, but it may be distinguished from the latter by the slender body form and weaker antennal club, fewer black markings on the forebody, and more distinctly developed pubescence on abdominal sternites.

Etymology. This species is named in honor of Mr. Hao Huang, who collected some specimens of the new species.

Figures

FIGURES 1–6. Habitus. 1, 2—Rhyncocheilus rugulipennis; 3, 4—R. huanghaoi; 5, 6—R. henanensis. Scale bars: 2 mm.

FIGURES 13–21. 13–15—Rhyncocheilus rugulipennis; 16–18—R. huanghaoi; 19–21—R. henanensis; 13, 16, 19—male head; 14, 17, 20—female head; 15, 18, 21—Labrum. Scale bars: 1 mm.

FIGURES 30–37. Aedeagal characters. 30–33—Rhyncocheilus rugulipennis; 34–37—R. huanghaoi; 30, 34—aedeagus in lateral view; 31, 35—aedeagus in ventral view; 32, 36—apical portion of aedeagal median lobe in ventrolateral view; 33, 37—inner side of apical parameral portion. Scale bars: 0.5 mm.