Hesperosoma (s.str.) chenchangchini, Cai 1 & Tang 1 & Schillhammer 2, 2021

Cai 1, Yu-Jie, Tang 1, Liang & Schillhammer 2, Harald, 2021, A review of the genus Hesperosoma Scheerpeltz (Coleoptera, Staphylinidae, Staphylininae) of China, ZooKeys 1075, pp. 137-174 : 137

Hesperosoma (s.str.) chenchangchini sp. nov.

Figures 9 , 13-18

Material examined.

Holotype. China - Yunnan Prov. • ♂; glued on a card with labels as follows: " China: Yunnan Deqin County, Nagu Vill ; alt. 2250 m; 11 Jul 2010; Wen-Xuan Bi leg." " Holotype / Hesperosoma (s.str.) chenchangchini / Cai, Tang & Schillhammer" [red handwritten label]; SHNU . Paratypes. China - Yunnan Prov. • 2♂ ♂, 1 ♀; Gongshan County, Heiwadi ; alt. 2000 m; 07 Jul 2009; Jian-Qing Zhu leg.; SHNU .

Description.

Measurements of male: BL: 12.17-13.87 mm, FL: 6.95-7.63 mm. HL: 1.89-2.07 mm, HW: 2.41-2.79 mm, EYL: 0.65-0.77 mm, TL: 0.96-1.12 mm, PL: 2.30-2.68 mm, PW: 2.00-2.23 mm, EL: 3.13-3.44 mm, EW: 3.06-3.51 mm. HW/HL: 1.24-1.35, TL/EYL: 1.41-1.48, PL/PW: 1.14-1.20, EL/EW: 0.98-1.02.

Measurements of female: BL: 12.73 mm, FL: 7.06 mm. HL: 1.89 mm, HW: 2.34 mm, EYL: 0.68 mm, TL: 0.90 mm, PL: 2.38 mm, PW: 2.07 mm, EL: 3.17 mm, EW: 3.28 mm. HW/HL: 1.24, TL/EYL: 1.32, PL/PW: 1.15, EL/EW: 0.97.

Head, pronotum and elytra metallic dark blue to violaceous blue; abdomen with segments III-V reddish, VI black with anterior margin narrowly reddish, VII black with posterior margin broadly reddish-yellow, segments VIII and X entirely reddish-yellow, segment IX reddish; antennae black, base and apex of segment 1 and 2 reddish, segments 8-11 creamy white; mandibles dark brown, medial margin and distal portion of mandible dark reddish-brown; maxillary and labial palpi deep black, last segments sometimes slightly paler brownish.

Head (Fig. 9 ) 1.24-1.35 times as wide as long, rounded trapezoid, tempora narrowed towards neck in regular arc, eyes moderately protruding; surface with dense and coarse punctation, mostly contiguous; frons impunctate; with short, weakly delimited impunctate mid-line, extending from frons to about half of mid-length; antennae with segments 4-8 markedly oblong, segments 9 and 10 about as long as wide.

Pronotum 1.14-1.20 times as long as wide, widest at level of large lateral seta, narrowed towards base in wide, but shallow concave arc; surface as densely and coarsely punctate as on head, with indistinct, short impunctate mid-line in posterior half; scutellum with dense and pit-like punctation, interstices forming small transverse rugae.

Elytra 0.97-1.02 times as long as wide, exceedingly densely, coarsely punctate, punctures almost contiguous.

Abdominal tergites III-V with basal transverse depression, punctation of abdominal tergites IV-V moderate and sparse at base, abdominal tergite III impunctate at base; posterior halves of abdominal tergites III-V and entire surface of remaining tergites with very fine and dense punctuation.

Male. Protarsomeres 1-4 moderately dilated, heart-shaped; sternite VII with patch of yellow setae on median portion and posterior margin broadly emarginate at middle; sternite VIII with posterior margin broadly emarginate at middle; aedeagus (Figs 15-17 ) with median lobe and paramere slightly asymmetrical, paramere (Fig. 17 ) shorter than median lobe and slightly bent to left side in ventral view.

Female. Tergite X (Fig. 18 ) slightly asymmetrical with posterior margin projecting at middle.

Etymology.

This species is named in honour of Mr. Chang-Chin Chen who donates lots of staphylinid specimens to the SHNU, including the holotype of the new species.

Distribution.

China (Yunnan).

Diagnosis.

Amongst the species of the nominal subgenus with reddish abdomen, H. malaisei from Myanmar, H. chinense (Shaanxi, Hubei, Sichuan) and H. rufomarginatum from Vietnam, the new species may be easily recognised by four outer segments of antennae creamy white (five outer segments of antennae creamy white in H. chinense and H. malaisei ), entirely metallic dark blue to violaceous blue elytra (reddish suture and shoulders of elytra in H. rufomarginatum ).

Figures

Figures 9 - 12. Head of species of subgenus Hesperosoma Hesperosoma 9 H. chenchangchini sp. nov. 10 H. puetzi 11 H. xizangense sp. nov. 12 H. languidum sp. nov. Scale bars: 1 mm.

Figures 13 - 18. Hesperosoma chenchangchini sp. nov. 13 - 14 habitus 15 - 17 aedeagus, lateral (15) and ventral (16) views, paramere (17) 18 female abdominal tergite X. Scale bars: 2 mm (13 - 14), 0.2 mm (15 - 18).