Domene (Macromene) leigongensis, Lin & Peng, 2021

Lin, Xiao-Bin & Peng, Zhong, 2021, Two new species and additional records of mainland Chinese Domene (Coleoptera: Staphylinidae: Paederinae), Zootaxa 5081 (3), pp. 444-450 : 447

Domene (Macromene) leigongensis X.-B. Lin and Z. Peng, new species

( Fig. 2B , 3 )

Type material (3 ♂♂, 3 ♀♀). Holotype ♂: “ China: Guizhou Prov., Leishan County, Leigong Shan, Xiannütang , 26°22’22.11’’N, 108°11’52.12’’E, 1550 m, 06. V.2021, Tang, Peng, Cai & Song leg.” ( SNUC) . Paratypes: 1 ♂, 1 ♀: same data as holotype ( SNUC) ; 2 ♂, 1 ♀: same data, except “ 06. V.2021 ” ( SNUC) .

Description. Measurements (in mm) and ratios: TL 9.73–10.40, FL 5.36–5.75 HL 1.75–1.88, HW 1.69–1.75, AnL 4.39–4.51, NW 0.54–0.66, PL 1.75–2.00, PW 1.55–1.86, EL 1.75–1.88, EW 1.75–1.95, AW 1.57–1.67, AL 1.21, HL/HW 1.03–1.12, HW/PW 1.03–1.10, HL/PL 0.94–1.00, NW/HW 0.32–0.38, PL/PW 1.09–1.23, EL/PL 0.91–1.03.

Habitus as in Fig. 2B . Body black with distinctly paler abdominal apex; legs black to brown; antennae blackish brown to brown.

Head orbicular, widest behind eyes; punctation fine, distinctly umbilicate, and very dense, surface rather matt. All antennomeres longer than broad; antennomeres IV–X of equal length; antennomere I 2.1 times, II 1.3 times, III 1.6 times, XI 1.5 times as long as IV. Maxillary palpus very slender, preapical joint 3.2–3.7 times as long as broad.

Pronotum short, widest in the middle; lateral margins weakly convex in dorsal view; punctation similar to that of head; midline with short and very narrow rudiment of a glossy line posteriorly.

Elytra without distinct longitudinal ridges; macropunctation coarse, irregular; interstices with irregular micropunctation. Hind wings present. Protarsomeres I–IV moderately dilated.

Abdomen with fine and dense punctation on tergites III–VIII; posterior margin of tergite VIII ( Fig. 3A ) truncate; interstices with shallow microreticulation; posterior margin of tergite VII with palisade fringe.

Male. Sternites III–VI unmodified; sternite VII ( Fig. 3D ) with unmodified pubescence, posterior margin broadly and weakly emarginate; sternite VIII ( Fig. 3E ) moderately transverse, with pronounced oblong postero-median impression, in anterior portions of this impression with numerous strongly modified, short black setae; posterior excision U-shaped; aedeagus as in Figs 3F–G , ventral process short and stout; dorsal plate with long, sclerotized apical portion and with thin basal portion; internal sac with dark membranous apical structures.

Female. Posterior margin of sternite VIII ( Fig. 3B ) broadly convex; genital segment with tergite X narrowly truncated at the apex ( Fig. 3C ).

Comparative notes. The fine, dense and uniform punctation of the elytra, and the similar shape and chaetotaxy of the male sternite VII and sternite VIII suggest that D. leigongensis is allied to D. exicta . The species is distinguished from D. exicta by the morphology of the aedeagus (shape of ventral process), as well as by the somewhat smaller body size and the numerous strongly modified short black setae of the male sternite VIII. For illustrations of D. exicta see Assing (2016).

Distribution and natural history. The type locality is situated in Leigong Shan to the north of Leishan County, southeast Guizhou. The specimens were sifted from leaf litter at an altitude of 1550 m.

Etymology. The species is named after its type locality (Leigong Shan).

Figures

FIGURE 2. Habitus of Domene spp. (A–B) and abdominal segments of D. aqiang (C–E). A—D. hui; B—D. leigongensis. C—female tergite VIII; D—female sternite VIII; E—female tergites IX–X. Scale bars: A–B 2.0 mm, C–E 0.5 mm.

FIGURE 3. Domene leigongensis. A—female tergite VIII; B—female sternite VIII; C—female tergites IX–X. D—male sternite VII; E—male sternite VIII; F—aedeagus in lateral view; G—aedeagus in ventral view. Scale bars: 0.5 mm.