Yaginumaella spinapophysis C. Wang, Mi & Li, 2025

Wang, Cheng, Wang, Ying, Mi, Xiaoqi & Li, Shuqiang, 2025, Description of two new genera and seven new species of Plexippina Simon, 1901 (Araneae, Salticidae, Plexippini) from Southwest China, with a review of Yaginumaella Prószyński, 1979, ZooKeys 1257, pp. 215-247 : 215-247

Yaginumaella spinapophysis C. Wang, Mi & Li sp. nov.

Figs 13 , 14

Type material.

Holotype • ♂ ( IZCAS -Ar 45885 ), China: Sichuan: Miyi County, Binggu Township, Maidichong Village ( 26°40.76'N, 102°3.75'E, ca 2,240 m), 7. vi. 2024, X. Q. Zhang, Y. Wang, and Q. Z. Meng leg. Paratypes • 3 ♀ ( IZCAS -Ar 45886 –45888), same data as for holotype .

Diagnosis.

The male of Yaginumaella spinapophysis sp. nov. can be easily distinguished from congeners except Y. orthomargina Shao, Li & Yang, 2014 and Y. hagiang Wang, Li & Pham, 2023 by the presence of embolic division, but can be easily distinguished from those of two species by the bifurcated RTA with spinous ventral ramus (Fig. 13 C ) vs non-bifurcated in both of those species ( Shao et al. 2014: fig. 11; Wang et al. 2023 a: fig. 22 B). The female of this new species resembles that of Y. orthomargina in general shape of epigyne, especially the anteriorly located, single atrium, but differs by the almost round atrium (Fig. 14 A – D ) vs elongate-oval in Y. orthomargina ( Shao et al. 2014: figs 8, 9).

Description.

Male (Figs 13 A – C , 14 E, F, H, I ). Total length 5.89. Cephalothorax 2.83 long, 2.23 wide. Abdomen 3.25 long, 2.11 wide. Eye sizes and inter distances: AME 0.53, ALE 0.30, PLE 0.26, AERW 1.74, PERW 1.66, EFL 1.17. Legs: I 6.36 (1.83, 1.03, 1.60, 1.20, 0.70), II 5.42 (1.63, 0.98, 1.28, 0.93, 0.60), III 6.03 (1.75, 0.88, 1.40, 1.35, 0.65), IV 6.48 (1.88, 0.90, 1.50, 1.55, 0.65). Carapace elevated, mainly red-brown, with paler area anteriorly on central portion of thorax, clusters of white setae on anterolateral portion of eye field and posterior portion of thorax, pair of white lateral sub-marginal setal bands extending from spaces between ALEs and AMEs to posterior end, and dense dark setae on lateral sides of thorax and near AMEs; fovea dark red, line-shaped. Chelicerae red-brown, with typical dentition. Endites broadened distally, with dense disto-inner marginal dark setae. Labium darker than endites. Sternum dark brown, with two sub-round spots. Legs spiny. Dorsum of abdomen mainly dark, spotted, with longitudinal, central dark yellow patch followed by pair of oblique yellow stripes bearing white setae, and several transverse, arc-shaped dotted lines; venter mainly dark, with pair of longitudinal median dotted lines with slight curves.

Palp (Fig. 13 A – C ): tibia almost as long as wide in retrolateral view; retrolateral tibial apophysis bifurcated with spinous ventral ramus and flat, sheet-shaped dorsal ramus; cymbium setose, with truncated anterior edge; tegulum elongate-oval, with posteriorly extended posterior lobe; embolus strongly sclerotized, arises at ca 9 o′clock position, runs along tegular margin at origin, and then antero-retrolaterally extended to pointed tip, basally fused with twisted division with blunt terminus.

Female (Fig. 14 A – D, G ). Total length 5.88. Cephalothorax 2.39 long, 1.76 wide. Abdomen 3.53 long, 2.83 wide. Eye sizes and inter distances: AME 0.50, ALE 0.29, PLE 0.26, AERW 1.54, PERW 1.51, EFL 1.10. Legs: I 4.04 (1.33, 0.80, 0.73, 0.68, 0.50), II 4.04 (1.28, 0.75, 0.88, 0.63, 0.50), III 4.83 (1.45, 0.75, 1.03, 1.00, 0.60), IV 5.34 (1.58, 0.78, 1.18, 1.20, 0.60). Habitus (Fig. 14 G ) similar to that of male except lacking pair of white lateral sub-marginal setal bands and with dense white setae centrally on thorax.

Epigyne (Fig. 14 A – D ): slightly longer than wide, with pair of posteriorly extended hoods ~ 1.5 × longer than wide and lateral to basal portion of atrium; atrium anteriorly located, almost round; copulatory ducts forming complicated coils, anteromedially attached straight, bar-shaped, anterolaterally extended secondary spermathecae / accessory glands; spermathecae without distinct border, distinct from each other ~ 2 / 3 atrial width; fertilization ducts originate from anterior-most edges of spermathecae.

Distribution.

Known only from the type locality in Sichuan, China (Fig. 2 ).

Etymology.

The specific name is a combination of spin (refers to spinosus) and apophysis, which refers to the spiniform ventral ramus of retrolateral tibial apophysis; noun in apposition.

Figures

Figure 2. Geographical records of the new species.

Figure 13. Male palp of Yaginumaella spinapophysis sp. nov., holotype (IZCAS - Ar 45885). A. Palp, prolateral; B. Ditto, ventral; C. Ditto, retrolateral. Abbreviations: E = embolus, ED = embolic division, RTA = retrolateral tibial apophysis, PL = posterior tegular lobe, SD = sperm duct. Scale bars: 0.1 mm.

Figure 14. Yaginumaella spinapophysis sp. nov., male holotype (IZCAS - Ar 45885) (E, F, H, I), female paratype (IZCAS - Ar 45886) (A, B, G) and female paratype (IZCAS - Ar 45887) (C, D). A, C. Epigyne, ventral; B, D. Vulva, dorsal; E, G. Habitus, dorsal; F. Ditto, ventral; H. Carapace, frontal; I. Chelicera, posterior. Abbreviations: At = atrium, CD = copulatory duct, FD = fertilization duct, H = epigynal hood, S = spermatheca, SS / AG = secondary spermatheca / accessory gland. Scale bars: 0.1 mm (A – D, I); 0.5 mm (H); 1.0 mm (E – G).