Dysanabatium hainanense Peng & Li

Peng, Zhong, Assing, Volker, Li, Li-Zhen & Zhao, Mei-Jun, 2014, A new species of Dysanabatium Bernhauer and additional records of D. jacobsoni Bernhauer (Coleoptera, Staphylinidae, Paederinae), ZooKeys 409, pp. 93-102 : 94-96

Dysanabatium hainanense Peng & Li sp. n. Figs 1A, 2, 5

Type material.

(8 ♂♂, 1 ♀). Holotype: ♂, labelled 'China: Hainan Prov., 24 km NE Wuzhishan, Wuzhi Shan Guanshandian, 18°53'N, 109°40'E, alt. 650 m 19.iv.2012, Peng & Dai leg.' (SNUC). Paratypes: 1 ♀, same label data as holotype (SNUC); 4 ♂♂, same data, but ' 18°54'N, 109°41'E, 21.iv.2012, alt. 650-700 m’ (SNUC); 2 ♂♂, same data, but 'alt. 700 m 18.iv.2012' (SNUC); 1 ♂, same data, but 'Lingshui County, Diaoluo Shan, 18°43'N, 109°53'E, 25.iv.2012, alt. 950-1,000 m’ (SNUC).

Description.

Measurements (in mm) and ratios: BL 5.89-6.43, FL 3.34-3.45, HL 0.80-0.84, HW 1.05-1.15, AnL 1.94-2.08, PL 0.93-0.98, PW 0.78-0.83, EL 1.11-1.19, AL 0.89-0.93, HL/HW 0.73-0.76, HW/PW 1.35-1.39, HL/PL 0.85-0.86, PL/PW 1.16-1.19, EL/PL 1.19-1.23, diameter of eye: 0.50-0.54.

Habitus as in Fig. 1A. Body entirely black, glossy, devoid of microsculpture; labial palpi and segments I, II, IV of maxillary palpi brownish yellow, segment III of maxillary palpi infuscate; antennae blackish brown at base, gradually becoming paler towards the reddish brown apices; basal halves of femora brownish yellow, distal halves gradually infuscate; tibia and tarsi infuscate.

Head transverse, eyes very large and prominent, temples convergent posteriorly in almost straight line, posterior angles inconspicuous; punctation moderately coarse and dense, sparser in median dorsal portion. All antennomeres oblong.

Pronotum with strongly convex lateral margins in dorsal view; punctation shallow, sparser than that of head; impunctate midline broad.

Elytra with coarse simple punctation arranged in longitudinal series in anterior seven tenths, becoming finer and shallower posteriorly; pubescence golden, erect, conspicuous. Hind wings fully developed.

Abdomen strongly dilated from segments III to apex of segment VI, segment VII convexly tapering posteriorly; segments III–VII with strongly reflexed paratergites; punctation sparse and fine; pubescence fine and pale, with interspersed longer, darker pubescence, especially posteriorly.

Protarsi very strongly, slightly asymmetrically dilated in both sexes; profemora with bases slender, very strongly, symmetrically incrassate to apical third; outer surfaces of tibiae with pale pubescence. First metatarsomere longer than second, subequal to or slightly shorter than fifth; fourth tarsomere simple.

Male. Posterior margin of tergite VIII (Fig. 2D) broadly convex; sternites III–VI unmodified; posterior margin of sternite VII broadly concave; sternite VIII (Fig. 2E) symmetric and strongly tapering posteriorly, with moderately deep, subtriangular posterior emargination; aedeagus as in Figs 2F, G, ventral process moderately stout and apically acute; internal sac with simple membranous structures and an apically rounded, weakly sclerotized structure.

Female. Posterior margin of tergite VIII (Fig. 2A) asymmetrically and broadly convex; sternite VIII (Fig. 2B) longer than that of male, posterior margin broadly convex; tergite IX (Fig. 2C) with short antero-median portion and moderately long postero-lateral processes; tergite × 5.0 times as long as antero-median portion of tergite IX (Fig. 2C).

Distribution and natural history.

The type locality is situated in the Wuzhi Shan and Diaoluo Shan, central Hainan. The specimens from Wuzhi Shan were sifted from flood debris, moss, leaf litter and soil near streams in evergreen broad leaved forest, partly together with Dysanabatium jacobsoni Bernhauer, 1915 (Fig. 5).

Etymology.

The specific epithet is derived from Hainan, the province where the type locality is situated.

Comparative notes.

In external (transverse head; elongate elytra; bicolorous femora) and the male sexual characters (shapes and chaetotaxy of the male sternites VIII), Dysanabatium hainanense resembles Dysanabatium jacobsoni Bernhauer, 1915 and Dysanabatium birmana Cameron, 1931. The new species is distinguished from the former by less prominent posterior angles of the head, somewhat larger eyes, the somewhat shorter fifth metatarsomere, and the morphology of the aedeagus (different shape of ventral process and stouter sclerotized structure in internal sac). For illustrations of Dysanabatium jacobsoni see Figs 1 B–H, 3 A–P, 4 A–F and Rougemont (1997: 323, Fig. 1; 324, Figs 3 a– 5). It differs from Dysanabatium birmana by greater body size, the transverse head, the larger eyes, the darker and much longer antennae, the black and glossy pronotum, the denser punctation of the elytra, the larger aedeagus, the somewhat stouter ventral process in lateral view and the weakly sclerotized internal sac of the aedeagus. For illustrations Dysanabatium birmana see Rougemont (1997: 324, Fig. 6).