Singaporemma banxiaoensis, Lin, Yucheng & Li, Shuqiang, 2014

Lin, Yucheng & Li, Shuqiang, 2014, New cave-dwelling armored spiders (Araneae, Tetrablemmidae) from Southwest China, ZooKeys 388, pp. 35-67 : 38-39

Singaporemma banxiaoensis sp. n. Figs 4-6, 16 C–D, 20A, 22

Material.

Holotype ♂, paratypes 5♂ and 10♀ (IZCAS), CHINA, Guangxi: Pingxiang City, Xiashi Town, Xinming Village, Banxiaotun, Banxiao Cave, 22°5.542'N, 106°52.148'E, elevation ca. 175 m, 26 July 2011, Xiaoxiao Wang leg.

Etymology.

The specific name refers to the type locality; adjective.

Diagnosis.

This new species is similar to Singaporemma halongense Lehtinen, 1981 (see Lehtinen 1981: 31, figs. 43, 49, 54, 58, 62), but can be distinguished by the white vestigial eyespots in both sexes (Figs 4A, C, G–H), the shape of bulb and psembolus in the male (Figs 5 A–D, 16 C–D), the inverted triangular inner vulval plate and the wide, robust central process (Figs 6C, 20A), and the presence of a rhombic vulval dorsal plate (Figs 6C, 20A) in the female.

Description.

Male (holotype). Coloration: body brownish-yellow; legs yellowish-orange.

Measurements: total length 1.02; carapace 0.45 long, 0.36 wide, 0.21 high; abdomen 0.64 long, 0.55 wide, 0.55 high; clypeus 0.16 high; sternum 0.28 long, 0.29 wide. Length of legs: I 1.15 (0.38, 0.12, 0.27, 0.20, 0.20); II 1.13 (0.36, 0.11, 0.27, 0.20, 0.20); III 1.04 (0.30, 0.11, 0.23, 0.20, 0.20); IV 1.35 (0.43, 0.12, 0.34, 0.23, 0.23).

Carapace (Figs 4 A–B, G, E) reticulated, margin rugose; eyes white, vestigial; clypeus sloping forward, marginally rounded; cephalic part flat; sternum finely re ticulated, margin rugose, with sparse setae. Legs: cuticle striated; all tibiae with 2 trichobothria, and one on metatarsi I–IV.

Abdomen (Figs 4 A–B, E): dorsal scutum oval, finely reticulated, covered with sparse setae; ventral scutum reticulated; perigenital scutum present; postepigastral scutum slightly recurved; preanal scutum rectangular.

Palp (Figs 5 A–D; 16C, D): femoral cuticle sculptured and granulated, approximate 3 times patella in length; tibia strongly swollen, approx. 2.2 times femur in width (Figs 5A, B); cymbium posteriorly narrow and anteriorly wide (Fig. 5C); bulb egg-shaped, its surface with irregular lines (Fig. 5C); embolus long, proximally straight but distally flexible (Figs 16 C–D).

Female (paratype). Coloration: same as in male.

Measurements: total length 1.11; carapace 0.47 long, 0.38 wide, 0.22 high; abdomen 0.68 long, 0.64 wide, 0.64 high; clypeus 0.14 high; sternum 0.29 long, 0.29 wide. Lengths of legs: I 1.22 (0.41, 0.13, 0.28, 0.20, 0.21); II 1.15 (0.38, 0.12, 0.27, 0.20, 0.20); III 1.06 (0.32, 0.12, 0.24, 0.20, 0.19); IV 1.41 (0.45, 0.13, 0.36, 0.25, 0.23).

Carapace (Figs 4 C–D, H and F) as in male; clypeus slightly lower than in male. Legs: the chaetotaxy as in male.

Abdomen (Figs 4 C–D, F; 6A): dorsal scutum reticulated, covered with sparse setae; lateral scutum I anteriorly short, not extending beyond posterior rim of operculum; operculum centrally smooth, laterally rugose; postepigastral scutum slightly curved, medially narrow and laterally wide; perigenital plates long; preanal scutum reticulated, rectangular, with sparse serrated setae.

Genitalia (Figs 6C; 20A): epigynal pit distinct, oval; vulval posterior margin strongly sclerotized (Fig. 6B); vulval dorsal plate rhombic, fused to vulval posterior margin (Figs 6C; 20A); vulval stem triangular (Fig. 20A); vulval ducts proximally narrow, distally wide; lateral horns and vulval ducts forming a “V” -shape; spermathecae rugose, translucent, and membranous; inner vulval plate inverted triangle, distinctly sclerotized, wider than central process (Figs 6C; 20A); central process contracted basally, medially wide (Fig. 20A).

Variation.

Total length from 1.00 to 1.07 in males (n = 6) and from 1.05 to 1.14 in females (n = 10).

Distribution.

Known only from the type locality (Fig. 22).