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

Figures 12 , 36-40

Material examined.

Holotype. China - Yunnan Prov. • ♂; glued on a card with labels as follows: " China: Yunnan, Lushui County, Yaojiapin ; alt. 2540 m; 21 Jun 2010; Liang Tang leg." " Holotype / Hesperosoma (s.str.) languidum / Cai, Tang & Schillhammer" [red handwritten label]; SHNU.

Description.

Measurements of male: BL: 15.63 mm, FL: 7.48 mm. HL: 2.19 mm, HW: 2.68 mm, EYL: 0.68 mm, TL: 1.21 mm, PL: 2.72 mm, PW: 2.27 mm, EL: 3.06 mm, EW: 3.05 mm. HW/HL: 1.22, TL/EYL: 1.78, PL/PW: 1.20, EL/EW: 1.00.

Head and pronotum metallic violaceous blue to deep blue, elytra dark metallic violaceous blue, usually a bit more opaque than head and pronotum; abdomen with segments III-VI dark red, segment VII dark red with posterior margin broadly reddish-yellow, segments VIII and X entirely reddish-yellow, segment IX reddish-yellow with apical third of latter blackish; antennae black, base and apex of segments 1 and 2 and base of segment 3 reddish, four outer segments creamy white; mandibles dark reddish-brown; maxillary palpi with segments I-III black, segment IV brown, labial palpi with segments I and II black, segment III brown.

Head (Fig. 12 ) 1.22 times as wide as long, rounded trapezoid, tempora regularly convex, eyes moderately protruding; surface with dense and shallow punctation, mostly contiguous; frons impunctate; with short, weakly delimited impunctate mid-line, extending from impunctate frons to about half of mid-length; antennae with segments 4-8 markedly oblong, segment 9 slightly oblong.

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

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

Abdominal tergites III-V with basal transverse depression, punctation of abdominal tergites III-V feeble at base; posterior halves of abdominal tergites III-V and entire surface of remaining tergites with very fine and dense punctation.

Male. Protarsomeres 1-4 moderately dilated, heart-shaped; sternite VII with patch of long bright yellow setae on median portion; sternite VIII with posterior margin emarginate at middle; aedeagus (Figs 38-40 ) with median lobe and paramere slightly asymmetrical, paramere (Fig. 40 ) relatively shorter than median lobe, aedeagus very similar to that of H. puetzi , but paramere narrower and apex of the median lobe markedly slender in lateral view.

Female. Unknown.

Etymology.

The specific epithet refers to the shallow punctation of the new species

Distribution.

China (Yunnan).

Diagnosis.

The new species is very similar to H. puetzi (Sichuan), but can be easily distinguished from it by smaller eyes with TL/EYL about 1.70 (1.47 in H. puetzi ); head, pronotum and elytra with dense and shallow punctation (punctation in H. puetzi dense and coarse); abdominal tergites III-V without pit-like punctures in basal half. In appearance, it is also similar to H. flavoterminale (Sichuan), H. tarasovi from Laos and H. kleebergi from China (Xizang) and Nepal, but can be distinguished from H. flavoterminale and H. kleebergi by the antennal segments VIII-XI being creamy white (segments VII-XI creamy white in H. flavoterminale and H. kleebergi ); and from H. tarasovi by the narrower head.

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 36 - 40. Hesperosoma languidum sp. nov. 36 - 37 habitus 38 - 40 aedeagus, lateral (38) and ventral (39) views, paramere (40). Scale bars: 2 mm (36 - 37), 0.2 mm (38 - 40).