Orchestina alata Tong & Li sp. nov.

Figs 1, 2, 3

Material examined.

Holotype China • ♂ (SYNU -1604), fogging; Yunnan, Mengla Co., Menglun Town, XTBG, primary tropical seasonal rain forest; 21°55.035'N, 101°16.500'E, 558 ± 17 m; 22.VII.2007; Zheng G. leg. Paratypes. China • 1 ♂ (SYNU -1605), same data as holotype • 1 ♂ 1 ♀ (SYNU -1477 –78), same data as holotype • 2 ♂ 1 ♀ (SYNU -1418 –20), same data as holotype • 1 ♀ (SYNU -F–4756), fogging; Nanshahe Vill., seasonal rainforest; 21°36.201'N, 101°34.398'E, 826 ± 43 m; 14.VII.2012; Zhao Q. & Chen Z. leg.

Diagnosis.

The new species is similar to Orchestina sinensis Xu, 1987 in the yellowish carapace and the pear-shaped bulbus, but can be distinguished by the sub-apical wing-shaped protrusions of bulbus (vs lacking, but with a crest; cf. Fig. 3 A, D and Xu 1987: figs 5, 6), the basal large denticle of male endites (vs lacking; cf. Fig. 3 C) and the short column-shaped marking of epigaster (vs with a large reddish oval spot; cf. Fig. 2 H and Xu 1987: fig. 4).

Description.

Male (holotype). Carapace (Fig. 1 A, D): 0.61 long, 0.41 wide; yellowish, oval in dorsal view, with some long setae; pars cephalica elevated in lateral view. Eyes (Fig. 1 A, C): well developed, PME largest; posterior eye row recurved from dorsal view. Clypeus (Fig. 1 C, D): margin unmodified, curved downwards in front view, sloping forward in lateral view. Sternum (Fig. 1 B): as long as wide, surface smooth, setae sparse, needle-like, evenly scattered. Mouthparts (Figs 1 B, C, 3 C): chelicerae straight, anterior face unmodified; labium diamond-shaped, not fused to sternum, anterior margin not indented at middle; endites strongly sclerotized on outer margin, with serrula in single row, outer margin smoothly curved. Abdomen ovoid, 0.53 long; dorsum soft portions pale white, without color pattern. Legs: yellow, without color pattern; femur IV thickened, wider than femora I-III. Palp (Fig. 3 A – E): tibia not enlarged, length / width = 1.77, cymbium elongated ovoid; bulb pear-shaped in lateral view, with ventral side strongly protruding proximally, ca 1.72 × as wide as tibia; the sperm duct with four loops in prolateral view; embolus tapered, with sub-apical wing-shaped protrusions.

Female (SYNU -1478). Same as male except as noted. Body: habitus as in Fig. 2 A – C; body length 1.36. Carapace (Fig. 2 E): 0.66 long, 0.49 wide. Abdomen: 0.69 long. Epigaster (Fig. 2 H): without special external features.

Endogyne (Fig. 3 F, G): with stout medial clavate sclerite (AUS), provided with pair of lateral protrusions (Pr); anterior receptaculum (ARe) triangular, semitransparent, slightly longer than AUS; posterior plate (PP) present, large.

Distribution.

Known only from the type locality.

Etymology.

The specific name is derived from the Latin alatus, meaning ‘ winged’, and refers to the subapical wing-shaped protrusions of the bulbus.