Hesperosoma (s.str.) xizangense, 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.) xizangense sp. nov.

Figures 11 , 53-57

Material examined.

Holotype. China - Xizang Prov. • ♂; glued on a card with labels as follows: " China: Xizang, Bomi County, Yigong ; alt. 2397 m; 27 Jul 2016; Yan-Quan Lu leg.; mixed forest." " Holotype / Hesperosoma (s.str.) xizangense / Cai, Tang & Schillhammer" [red handwritten label]; SHNU.

Description.

Measurements of male: BL: 13.67 mm, FL: 8.12 mm. HL: 2.26 mm, HW: 2.91 mm, EYL: 0.74 mm, TL: 1.24 mm, PL: 2.75 mm, PW: 2.34 mm, EL: 3.55 mm, EW: 3.59 mm. HW/HL: 1.29, TL/EYL: 1.68, PL/PW: 1.18, EL/EW: 0.99.

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

Head (Fig. 11 ) 1.29 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; 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 1.18 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 third; scutellum with dense and pit-like punctation, interstices forming small transverse rugae.

Elytra as long as wide, exceedingly densely, coarsely punctate, punctures almost contiguous.

Abdominal tergites III-V with basal transverse depression, punctation of abdominal tergites III-V large, but feeble 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 long yellow setae on median portion and posterior margin broadly emarginate at middle; sternite VIII with posterior margin emarginate at middle; aedeagus (Figs 55-57 ) very similar to that of H. puetzi and H. xizangense sp. nov., but markedly larger, median lobe and paramere slightly asymmetrical, paramere (Fig. 57 ) shorter than median lobe and slightly bent to left side in ventral view.

Female. Unknown.

Etymology.

The species is named after the type locality

Distribution.

China (Xizang).

Diagnosis.

The new species is very similar externally to H. languidum sp. nov. (Yunnan) and H. puetzi (Sichuan), but can be recognised by the emarginated anterior margin of frons (Figs 8 - 9 ), as well as by the different shape of the aedeagus, especially the paramere, which is broad and truncate apically. Additionally, the head is wider, 1.29 times as wide as long (1.14-1.16 in H. puetzi , 1.22 in H. languidum sp. nov.), the mandibles are relatively darker (relatively lighter in H. puetzi and H. languidum sp. nov.) and the legs are relatively darker (relatively lighter in H. puetzi and H. languidum sp. nov.).

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 53 - 57. Hesperosoma xizangense sp. nov. 53 - 54 habitus 55 - 57 aedeagus, lateral (55) and ventral (56) views, paramere (57). Scale bars: 2 mm (53 - 54), 0.2 mm (55 - 57).

Figures 2 - 8. 2 rotten bamboo trap (Photo by Mr. Yu-Jie Cai from Guizhou, Leishan County, Xiannuetang at 1 May 2021) 3 habitat of H. flavoterminale (Photo by Mr. Qin-Hao Zhao from Sichuan, Dujiangyan City, Mt Qingchengshan at 1 Aug. 2021) 4 living H. flavoterminale on decaying tree (Photo by Mr. Qin-Hao Zhao from Sichuan, Dujiangyan City, Mt Qingchengshan at 1 Aug 2021) 5 living H. languidum sp. nov. running on decaying tree with fungi during the night (Photo by Mr. Liang Tang from Yunnan, Lushui County, Yaojiapin at 21 Jun 2010) 6 living H. excellens on rotten bamboo (Photo by Mr. Liang Tang from Anhui, Tangkou Town, Jiulongpu at 1 Jul 2020) 7 living H. guizhouense hunting for maggots in rotten bamboo (Photo by Mr. Yu-Jie Cai from Guizhou, Leishan County, Xiannuetang at 2 May 2021) 8 living H. klapperichi sucking tree sap (Photo by Mr. Zhong Peng from Guangxi, Jinxiu County, ' 16 km' at 13 Jul 2014).