Yaginumena xuanzan Lin & Li, 2024

Lin, Yejie, Li, Shuqiang, Mo, Haolin & Wang, Xihao, 2024, Thirty-eight spider species (Arachnida: Araneae) from China, Indonesia, Japan and Vietnam, Zoological Systematics 49 (1), pp. 4-98 : 86-89

Yaginumena xuanzan Lin & Li , sp. nov. ( Figs 70–71 , 73C–D )

Etymology. The species is named after Xuan Zan, a character in the classic Chinese novel Outlaws of the Marsh; noun in apposition.

Diagnosis. The male of the new species is similar to Y. mutilata (Bösenberg & Strand, 1906) (see Yoshida, 2002) by the needle-shaped embolus and the same shaped sperm duct. However, the new species can be distinguished from Y. mutilata by the conductor directed dorsally in ventral view (vs. directed retrolaterally in ventral view). The female of the new species is similar to Y. castrata (see Yoshida, 2002) by the oval atrium. However, it can be distinguished by the primary and secondary spermathecae being equal in size (vs. primary spermathecae about twice as large as secondary spermathecae).

Description. Male (holotype). Total length 1.37, carapace 0.54 long, 0.46 wide, opisthosoma 0.78 long, 0.69 wide. Eye sizes and interdistances: AME 0.03, ALE 0.03, PME 0.03, PLE 0.03, AME–AME 0.05, AME–ALE 0.03, PME–PME 0.02, PME–PLE 0.03, AME–PME 0.04, ALE–PLE 0. Leg measurements: I 1.79 (0.52, 0.59, 0.40, 0.28), II 1.42 (0.42, 0.44, 0.32, 0.24), III 1.15 (0.35, 0.34, 0.25, 0.21), IV 1.62 (0.48, 0.55, 0.34, 0.25).

Coloration ( Fig. 73C ). Carapace black-brown, edge black, eyes with black rings. Chelicerae black-brown. Endites and labium yellowish brown. Sternum yellowish brown. Legs pale yellow, covered with dense setae. Opisthosoma gray-brown, with dense setae. Spinnerets yellowish brown.

Palp ( Fig. 70 ). Patella almost as long as tibia. Cymbium almost 1.3 times longer than wide. Sperm duct with 3 loops. Tegular apophysis triangular. Conductor tip triangular. Embolic base expanded, terminal of embolus needle shaped.

Female (paratype Ar44893). Total length 2.36, carapace 0.70 long, 0.56 wide, opisthosoma 1.60 long, 1.23 wide. Eye sizes and interdistances: AME 0.04, ALE 0.03, PME 0.04, PLE 0.03, AME–AME 0.05, AME–ALE 0.01, PME–PME 0.01, PME–PLE 0.02, AME–PME 0.04, ALE–PLE 0. Leg measurements: I 1.95 (0.59, 0.63, 0.43, 0.30), II 1.58 (0.48, 0.49, 0.35, 0.26), III 1.38 (0.36, 0.43, 0.32, 0.27), IV 1.92 (0.58, 0.62, 0.45, 0.27).

Coloration ( Fig. 73D ). Similar to that of male.

Epigyne ( Fig. 71 ). Epigynal plate oval. Atrium oval, copulatory openings inconspicuous, situated anteriorly. Copulatory and fertilization ducts connected to secondary spermathecae anteriorly, straight. Primary spermathecae membranous, as wide as secondary spermathecae, secondary spermathecae more sclerotized. Fertilization ducts directed at 12:00-o’clock-position from secondary spermatheca.

Material examined. Holotype ♂ (IZCAS-Ar44892), China: Chongqing, Chengkou Co., 16.VI.2023, Yuyang Zhou leg. Paratypes. 5♂ 8♀ (IZCAS-Ar44893–Ar44903), same data as holotype .

Distribution. Known only from the type locality.

Figures

Figure 70. Yaginumena xuanzan Lin & Li, sp. nov., holotype male. A. Left palp, ventral view; B. Same, retrolateral view. Abbreviations: C—conductor; E—embolus; SD—sperm duct; ST—subtegulum; TA—tegular apophysis. Scale bars=0.05mm.

Figure 71. Yaginumena xuanzan Lin & Li, sp. nov., paratype female. A. Epigyne, ventral view; B. Vulva, dorsal view. Abbreviations: A—atrium; CD—copulatory duct; CO—copulatory opening; FD—fertilization duct; PS—primary spermatheca; SS—secondary spermatheca. Scale bars=0.03mm.

Figure 73. Theridiidae spp., dorsal view, holotype males (A, C) and paratype females (B, D), habitus. A–B. Theridion chenzhangfui Lin & Li, sp. nov.; C–D. Yaginumena xuanzan Lin & Li, sp. nov. Scale bars=0.3mm.