Platydracus aureolus, Huang & Chen & Tang, 2024

Huang, Jia-Yi, Chen, Jia-Wei & Tang, Liang, 2024, The genus Platydracus Thomson in Hainan, South China (Coleoptera, Staphylinidae, Staphylininae), ZooKeys 1212, pp. 129-141 : 129-141

Platydracus aureolus sp. nov.

Figs 4 , 17–20

Material examined.

Holotype. China – Hainan Prov. • ♂; glued on a card with two labels as follows: “ China: Hainan, Lingshui County, Diaoluoshan N. R. ; 18 ° 42 ' 2.66 ″ N, 109 ° 53 ' 19.32 ″ E; alt. 950 m – 1050 m; Aug. 2023; FIT; Zhao leg. ” “ Holotype / Platydracus aureolus / Huang, Chen & Tang ” [red handwritten label]; SHNU . Paratypes. China – Hainan Prov. • 1 ♂; Lingshui County, Diaoluoshan N. R. ; 18 ° 42 ' 2.66 ″ N, 109 ° 53 ' 19.32 ″ E; alt. 950 m – 1050 m; Aug. 2023; FIT; Zhao leg.; SHNU • 7 ♂♂ 2 ♀♀; Lingshui County, Diaoluoshan N. R. ; 18 ° 42 ' 2.66 ″ N, 109 ° 53 ' 19.32 ″ E, alt. 700 m; 9–16 Nov. 2022; FIT, Cai & Zhou leg; SHNU • 15 ♂♂ 6 ♀♀; Lingshui County, Diaoluoshan N. R. ; 18 ° 42 ' 2.66 ″ N, 109 ° 53 ' 19.32 ″ E; alt. 950–1050 m; Aug. 2023; FIT; Zhao leg.; SHNU, NHMD . VIETNAM – Vinh Phu Prov. • 1 ♂; Tam Dao ; 20–28 Jun. 1990; Mir. Dvořák leg.; NMPC • 1 ♂; Hanoi TAM DAO nat. park ; 75 km; 15 May – 16 Jun. 1991; leg. [collector illegible]; CNC .

Diagnosis.

The new species can be easily recognized from other Chinese species by larger body size and distinct coloration.

Description.

Measurements of male: BL: 21.9–25.2 mm, FL: 9.33–10.78 mm. HL: 2.34–2.78 mm, HW: 3.09–3.58 mm, EYL: 1.18–1.32 mm, TL: 0.88–1.03 mm, PL: 3.52–4.20 mm, PW: 3.70–4.20 mm, EL: 4.07–5.12 mm, EW: 4.81–5.68 mm. HW / HL: 1.29–1.32, TL / EYL: 0.75–0.78, PL / PW: 0.95–1.00, EL / EW: 0.85–0.90.

Body mostly black, except head and pronotum with strong golden tint on dorsal side, elytra light reddish-brown with several small dark marks, maxillary palpi, labial palpi and mandibles partially reddish-brown, legs reddish-brown, except for the trochanters, basal profemora and basal mesofemora blackish, tibial spurs dark brown, tarsomeres especially terminal segment more or less dark.

Head 1.29–1.32 times as wide as long, eyes large, tempora 0.75–0.78 times as long as eye; surface with punctation dense and umbilicate; pubescence mostly golden; antennomeres 1–3 distinctly longer than wide, antennomere 4 as long as wide, antennomeres 5–10 distinctly transverse, gradually incrassate, segments 4 to 11 covered with dense pubescence; maxillary palpi slender; mandibles relatively slender, inner edge of left mandible with two small teeth and two teeth on lower plane, inner edge of right mandible with small tooth on upper plane and small tooth on lower plane.

Pronotum 0.95–1.00 times as long as wide; punctation similar to that of head, pubescence golden, relatively longer and more distinct than that of head; disc with small middle specular patch near posterior margin; scutellum with dense rugulose punctation and black pubescence.

Elytra 0.85–0.90 times as long as wide, punctation fine and dense, pubescence mostly golden. Mesoventrite and metaventrite covered with golden pubescence laterally.

Abdomen with tergites densely punctate; tergites III – V each with a pair of large dark tomentose spots, the rest portions covered with golden pubescence, tergite VI and VII each with a pair of small dark tomentose spots near posterior margin which can be indistinct in some specimens, the rest portions covered with golden pubescence though that of basolateral portions more or less dark, tergite VIII covered with golden pubescence on basal two-thirds, and tergite VII with apical palisade fringe.

Male. Abdominal sternite VIII with posterior margin emarginate in the middle; aedeagus (Figs 19 , 20 ) asymmetrical, twisted to the right side in ventral view; median lobe with slender and elongate tip; paramere broad, with apical setae, subapical portion with cavity to accommodate the large apical tooth of the median lobe.

Etymology.

The specific epithet refers to the coloration of the new species.

Distribution.

China (Hainan).

Figures

Figures 1–4. Punctation of head and setae on the head and pronotum 1 P. hainanensis 2 P. juang 3 P. marmorellus with two types of setae 4 P. aureolus with one type of setae.

Figures 13–20. Habitus and aedeagus of Platydracus 13–16 P. hainanensis 17 – 20 P. aureolus 13, 17 dorsal habitus 14, 18 ventral habitus 15, 19 aedeagus in ventral view 16, 20 aedeagus in lateral view. Scale bars: 1.0 mm (13, 14), 2.0 mm (17, 18), 0.5 mm (15, 16), 0.2 mm (19, 20).