Yunguirius xiangding B. Li, Zhao & S. Li sp. nov.

Figs 4, 5

Type material.

Holotype ♀ (IZCAS-Ar44408): China: Sichuan Province: Luzhou City: Gulin County, Shiping Township, Xiangding Village, Huaer Cave, 28.0294°N, 106.0073°E, elevation: 641 m, 22.IV.2014, Y. Lin, H. Zhao, Y. Li, J. Wu and F. Li leg.

Etymology.

The new species is named after the type locality (Xiangding Village); noun in apposition.

Diagnosis.

Yunguirius xiangding sp. nov. resembles Y. subterebratus by having a cordiform atrium, asymmetric copulatory ducts, arch-shaped spermathecal stalks, fists on both sides, and the unilateral end of spermathecal head exposed. However, it can be distinguished from Y. subterebratus as follows: 1) crevice breaking at lateral margin of the atrium, below its hoods (Fig. 4A) in Y. xiangding sp. nov., but at anterior margin of the atrium, above its hoods (fig. 245A in Zhu et al. 2017) in Y. subterebratus; 2) the mid part of anterior margin of the atrium raised (Fig. 4A) in Y. xiangding sp. nov., but concave (fig. 245A in Zhu et al. 2017) in Y. subterebratus; 3) posterior epigynal sclerite vase-shaped (Fig. 4A) in Y. xiangding sp. nov., but waist-drum-shaped (fig. 245A in Zhu et al. 2017) in Y. subterebratus; and 4) spermathecal stalks extending laterally (Fig. 4B) in Y. xiangding sp. nov., but extending anteriorly (fig. 245B in Zhu et al. 2017) in Y. subterebratus .

Description.

Female (holotype) (Fig. 4). Body length 13.29. Carapace 6.21 long, 4.22 wide. Abdomen 7.08 long, 5.02 wide. Eye sizes and interdistances: AME: 0.14, ALE: 0.17, PME: 0.15, PLE: 0.16; AME-AME: 0.08; AME-ALE: 0.12; AME-PME: 0.06; ALE-PLE: 0.05; PME-PME: 0.07; PME-PLE: 0.22. All legs were used for prophase work of DNA extractions. Carapace dark brown, anterior black; fovea and radial grooves dark; chelicerae black, with three promarginal and two retromarginal teeth; endites and labium dark brown to black, anterior white with several hairs; sternum brownish, lateral brown, c. 1.2 times longer than wide. Abdomen yellowish-brown, nearly oval, posterior widest, with four dark chevrons and dark brown speckles. Epigyne (Fig. 4A, B): posterior epigynal sclerite vase-shaped, atrium cordiform, anterior widest, with sclerotic lateral margin, inside with inverted triangle osteon, outside with brownish markings, fold brown, ridge-shaped, close to the deep hood; copulatory opening small, located anteriorly, near the midline, and symmetric; copulatory duct beloid, and then swollen; first half of spermatheca dumbbell-shaped, long spermathecal head wrapped in copulatory duct, with unilateral end exposed; fertilization duct c. 3.5 times longer than wide, pointed laterally.

Male. Unknown.

Distribution.

Sichuan Province, China (Fig. 5).