Sernokorba ruanxiaoer, Lin & Li, 2023

Lin, YeJie & Li, Shuqiang, 2023, On nine ground spiders from Xishuangbanna, China (Araneae, Gnaphosidae), including two new genera and seven new species, ZooKeys 1174, pp. 141-174 : 141

Sernokorba ruanxiaoer sp. nov.

Figs 12A-C , 13A, B , 14A, B , 15A, B

Type material.

Holotype: ♂ (IZCAS-Ar44498), China, Yunnan: Menglun Town: Xishuangbanna Botanical Garden, 21.910767°N, 101.2709°E, ca 572 m, 15-31.II.2007, rubber-tea plantation, fogging. Guo Zheng leg. Paratypes: 2♂1♀ (IZCAS-Ar44499-Ar44501), same data as holotype.

Diagnosis.

The male of Sernokorba ruanxiaoer sp. nov. is similar to these of S. fanjing Song, Zhu & Zhang, 2004 and S. pallidipatellis ( Bösenberg & Strand, 1906) by the conductor without serration (Figs 12B , 13B ). Females of the new species are similar to those of S. pallidipatellis by unobvious copulatory openings (Fig. 14A ). However, the new species can be distinguished from S. fanjing by the tip of the conductor blunt (Figs 12B , 13B ) [vs sharped (see Wang et al. 2023: fig. 1B)] and can be distinguished from S. pallidipatellis by the tip of the embolus straight (Fig. 13A ) [vs curved (see Gallé-Szpisjak et al. 2023: figs 23, 33)]. The female can be distinguished from those of S. pallidipatellis by the ratio of the length of the spermathecae to the diameter of the copulatory duct is almost 1:1 and the diameter of the glandular appendage is longer than the diameter of the copulatory duct (Fig. 14B ) [vs 2:3 and shorter than the diameter of the copulatory duct (see Kamura 1992: fig. 7)].

Description.

Male holotype (Fig. 15A ). Total length 5.02; carapace 2.41 long, 1.72 wide, opisthosoma 2.48 long, 1.64 wide. Eye sizes and interdistances: AME 0.08, ALE 0.10, PME 0.09, PLE 0.09, AME-AME 0.05, AME-ALE 0.01, PME-PME 0.07, PME-PLE 0.06, AME-PME 0.09, ALE-PLE 0.09. Anterior eye row and posterior eye row recurved. Chelicerae with eight promarginal and one retromarginal teeth. Leg measurements: I 5.56 (1.63, 1.85, 1.14, 0.94), II 5.45 (1.49, 1.79, 1.21, 0.96), III 5.65 (1.58, 1.75, 1.37, 0.95), IV 8.29 (2.09, 2.32, 2.27, 1.61). Opisthosoma elongate-oval, venter dark brown, with four transverse white bands of setae, dorsal scutum almost 1/2 the length of the opisthosoma. Spinnerets dark brown.

Palp (Figs 12A-C , 13A, B ). Femur unmodified. Tibia slightly longer than patella. Retrolateral tibial apophysis 1.5 × longer than tibia, bent in its middle and with an apical hook. Cymbium almost two× longer than wide. Subtegulum (ST) obvious in prolateral and ventral view. Tegulum obvious, almost 2.5 × wider than long in ventral view, with long and U-shaped sperm duct (SD). Conductor (C) membranous, 1/2 the bulb length, encircled embolus distally. Embolus (E) short, originated from the apical portion of bulb, straight.

Female paratype (IZCAS-Ar44501) (Fig. 15B ). Total length 5.68; carapace 2.53 long, 1.86 wide, opisthosoma 3.13 long, 2.14 wide. Eye sizes and interdistances: AME 0.07, ALE 0.11, PME 0.09, PLE 0.11, AME-AME 0.05, AME-ALE 0.01, PME-PME 0.07, PME-PLE 0.06, AME-PME 0.11, ALE-PLE 0.08. Chelicerae with eight promarginal and one retromarginal teeth. Leg measurements: I 5.46 (1.67, 1.93, 0.97, 0.89), II 5.65 (1.72, 1.84, 1.13, 0.96), III 5.79 (1.54, 1.83, 1.27, 1.15), IV 7.93 (2.06, 2.39, 2.27, 1.21). Opisthosoma as in male but without dorsal scutum. Spinnerets dark brown.

Epigyne (Fig. 14A, B ). Epigynal plate almost as long as wide. Copulatory openings (CO) unobvious, the edge of the copulatory openings strongly sclerotized. Copulatory ducts (CD) slightly curved, with glandular appendage (GA) anteriorly. Spermathecae (S) pear-shaped. Fertilization ducts (FD) sickle-shaped, directed at 2 o’clock position from spermathecae.

Distribution.

Known only from the type locality.

Etymology.

The species is named after Ruan Xiaoer, one of the 108 outlaws in the classical Chinese novel 'Outlaws of the Marsh’; noun in apposition.

Figures

Figure 12. Sernokorba ruanxiaoer sp. nov., holotype male A prolateral view B ventral view C retrolateral view. Abbreviations: C = conductor, E = embolus, RTA = retrolateral tibial apophysis, SD = sperm duct, ST = subtegulum, T = tegulum.

Figure 13. Sernokorba ruanxiaoer sp. nov., paratype male A embolus, ventral view B conductor, ventral view.

Figure 14. Sernokorba ruanxiaoer sp. nov., paratype female A epigyne, ventral view B vulva, dorsal view. Abbreviations: CD = copulatory duct, CO = copulatory opening, FD = fertilization duct, GA = glandular appendage, S = spermatheca.

Figure 15. Sernokorba ruanxiaoer sp. nov., habitus, dorsal view A male holotype B female paratype.