Talaus yuyang Yao & Liu, 2024

Li, Cong-zheng, Yao, Yan-bin, Xiao, Yong-hong, Xu, Xiang & Liu, Ke-ke, 2024, Notes on species of Talaus Simon, 1886 (Araneae, Thomisidae) from China, with descriptions of two new species, ZooKeys 1190, pp. 195-212 : 195

Talaus yuyang Yao & Liu sp. nov.

Figs 8 , 9 , 11

Type material.

Holotype ♂, China: Chongqing Municipality: Chengkou County, Hongjun Park, 31°56'56.89"N, 108°40'15.84"E, late October 2022, Y.Y. Zhou leg. (Tho-322, ASM-JGSU). Paratypes: 1 ♂ 7 ♀, same data as holotype; 1 ♂, 1 ♀; Ledong County, Jianfengling National Natural Reserve, Mingfenggu scenic spot, 18°44'25.87"N, 108°50'47.83"E, 1-31 May 2021, Yun-hu Mo leg. (Tho-322, ASM-JGSU).

Etymology.

The specific name is taken from the first name of Mr Yuyang Zhou, who collected the specimens at Hongjun Park; noun in apposition.

Diagnosis.

The male is similar to that of Talaus sulcus ( Tang and Li 2010: 93, fig. 71B-D) in having the horn-like retrolateral tibial apophysis and the filariform embolus, but can be easily distinguished from it by the tegular ridge arising from ~ 8 o’clock position (vs 9 o’clock) and the very long finger-like ventral tibial apophysis (vs short, hump-like). The females of the new species can be easily recognized by the tunnel-like copulatory openings located anterolaterally, the very long copulatory ducts, and the spermathecae with many constrictions.

Description.

Male (holotype). Habitus (Figs 8A, B , 11 ). Total length 1.68. Carapace (Fig. 8A ) red brown, length 0.71, width 1.0, with densely short setae. Eyes (Fig. 8C ) diameters and interdistances: AME 0.05, ALE 0.11, PME 0.05, PLE 0.07; AME-AME 0.13, ALE-AME 0.26, PME-PME 0.27, PLE-PME 0.26, AME-PME 0.14, AME-PLE 0.42, ALE-ALE 0.76, PLE-PLE 0.79, ALE-PLE 0.18. MOA 0.24 long, front width 0.24, back width 0.38. Chelicerae red brown, straight, robust, without retromarginal or promarginal teeth. Endites yellow brown, longer than wide. Labium yellow brown, longer than wide. Sternum red brown, longer than wide. Legs red brown except yellow metatarsi and tarsi (Fig. 8A, B ); measurements: I 2.33 (0.71, 0.29, 0.51, 0.5, 0.32); II 2.41 (0.71, 0.29, 0.54, 0.53, 0.34); III 1.63 (0.48, 0.23, 0.35, 0.31, 0.26); IV 1.62 (0.49, 0.24, 0.38, 0.29, 0.22); spination: I Pa: d1; Ti: d2, p2, r2, v2; Mt: d4, p2, r2, v4; II Pa: d1; Ti: d2, p2, r2, v2; Mt: d4, p1, r2, v4; III Pa: d1; Ti: d2, p1; Mt: d2; IV: Pa: d1; Ti: r1; Mt: d1, p1, r1. Abdomen (Fig. 8A, B ) 0.98 long, 1.12 wide, ovoid, black brown; venter yellow.

Palp (Fig. 8D-G ). Ventral tibial apophysis digitiform, longer than tibia, apex slightly curved retrolaterally. Retrolateral tibial apophysis slightly shorter than tibia, horn-like, slightly curved in ventral view. Tegular ridge located at ~ 10 o’clock. Embolus filiform, arising from 9 o’clock and ending at ~ 3 o’clock, spiraling 1.5 coils.

Female (paratype). Habitus (Fig. 9A, B ). As in male except as follows. Total length 1.84. Carapace (Fig. 9A ) broadly square, length 0.83, width 0.95, with densely short setae. Eye (Fig. 9C ) diameters and interdistances: AME 0.05, ALE 0.09, PME 0.05, PLE 0.07; AME-AME 0.11, ALE-AME 0.26, PME-PME 0.24, PLE-PME 0.26, AME-PME 0.16, AME-PLE 0.41, ALE-ALE 0.72, PLE-PLE 0.71, ALE-PLE 0.19. MOA 0.24 long, front width 0.22, back width 0.33. Chelicerae yellow, with abundant thick setae on frontal surface. Legs measurements: I 1.98 (0.65, 0.27, 0.41, 0.36, 0.29); II 2.09 (0.71, 0.31, 0.45, 0.34, 0.28); III 1.32 (0.33, 0.24, 0.28, 0.23, 0.24); IV 1.51 (0.48, 0.22, 0.35, 0.27, 0.19); spination: I Fe: d2, p2; Ti: p2, v2; Mt: d4, p2, v2; II Ti: p2; Mt: d4, p2, v2; III Fe: d1; Pa: d1; Mt: d2, p2; IV: Fe: d1; Pa: d1; Mt: d2, p1. Abdomen (Fig. 9A, B ) ovoid, 1.01 long, 1.05 wide, yellow to black brown, with yellow margin dorsally; venter yellow.

Epigyne (Fig. 9D, E ). Copulatory openings located at antero-lateral part of atrium, transversal, tunnel-shaped. Copulatory ducts very long, convoluted, double S-shaped in ventral view, splay in dorsal view. Spermathecae sac-shaped, with many constrictions its surface. Fertilization ducts blade-like, directed anterolaterally.

Distribution.

Known only from the Chongqing Municipality and Hainan Province of China (Fig. 12 ).

Figures

Figure 8. Talaus yuyang sp. nov., male holotype A habitus, dorsal view B habitus, ventral view C prosoma, dorso-frontal view D palp, prolatero-ventral view E palp, ventral view F palp, retrolateral view G palp, dorsal view. Abbreviations: Em - embolus, RTA - retrolateral tibial apophysis, TR - tegular ridge, VTA - ventral tibial apophysis. Scale bars: 0.1 mm.

Figure 9. Talaus yuyang sp. nov., female paratype A habitus, dorsal view B same, ventral view C prosoma, dorso-frontal view D epigyne, ventral view E same, dorsal view. Abbreviations: CD - copulatory duct, CO - copulatory opening, EH - epigynal hood, FD - fertilization duct, Spe - spermatheca. Scale bars: 0.2 mm (A-C); 0.05 mm (D, E).

Figure 11. Photographs of live specimen from China A, B Talaus yuyang sp. nov., male.

Figure 12. Distributional records of Talaus dulongjiang Tang, Yin, Ubick & Peng, 2008 (yellow circles), T. niger Tang, Yin, Ubick & Peng, 2008 (black circle), T. sulcus Tang & Li, 2010 (red triangles), T. triangulifer Simon, 1886 (green circles), T. yuyang sp. nov. (blue circles) and T. zhangjiangkou sp. nov. (red square) from China.