Yunguirius xiangding B. Li, Zhao & S. Li, 2023

Li, Bing, Zhao, Zhe, Okumura, Ken-ichi, Meng, Kaibayier, Li, Shuqiang & Chen, Haifeng, 2023, Yunguirius gen. nov., a new genus of Coelotinae (Araneae, Agelenidae) spiders from southwest China, ZooKeys 1159, pp. 51-67 : 51

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 ).

Figures

Figure 4. Epigyne and female habitus of Yunguirius xiangding sp. nov. A epigyne, ventral B vulva, dorsal C female habitus, dorsal D same, ventral E same, lateral. Scale bar equal for C-E. Abbreviations: A = atrium; CD = copulatory duct; CO = copulatory opening; F = fold; FD = fertilization duct; H = hood; PES = posterior epigynal sclerite; S = spermatheca; SB = spermathecal base; SH = spermathecal head; St = stalk.

Figure 5. Distribution records of species of Yunguirius gen. nov. in China 1 Y. duoge sp. nov. 2 Y. ornatus 3 Y. subterebratus 4 Y. terebratus 5 Y. xiangding sp. nov.