Yaginumia sia (Strand, 1906)

Mi, Xiaoqi, Wang, Cheng & Su, Ming, 2025, Revision of the orb-weaving spider genus Yaginumia Archer, 1960 (Araneae, Araneidae) from China, ZooKeys 1223, pp. 169-184 : 169-184

Yaginumia sia (Strand, 1906)

Figs 5 , 6 , 7

Aranea sia Strand , in Bösenberg and Strand 1906: 237, pl. 4, fig. 24 (♀); Song 1980: 94, fig. 40 a – d (♂ ♀) (type material in Senckenberg Museum, Frankfurt am Main ( SMF), Germany, not examined).

Araneus sia Yaginuma, 1960: 115, fig. 50.1–3; Lee 1966: 40, fig. 10 m – o; Yaginuma 1971: 54, fig. 50.1–3 (♂ ♀); Yin 1978: 2, fig. 3 A – D (♂ ♀); Hu 1984: 97, fig. 92.1–2 (♂ ♀); Zhao 1993: 233, fig. 107 a – b (♂ ♀); Zhao 1995: 950, fig. 446 a – b (♂ ♀).

Yaginumia sia Archer, 1960: 14, figs 1–4 (♂ ♀); Namkung et al. 1972: 93, fig. 11 (♀); Guo 1985: 75, fig. 2–27.1 – 3 (♂ ♀); Yaginuma 1986: 109, fig. 57.6 (♂ ♀); Zhang 1987: 89, fig. 73.1–4 (♂ ♀); Ishinoda 1989: 21, figs 12, 13 (♂ ♀); Chikuni 1989: 75, fig. 39 (♂ ♀); Feng 1990: 101, fig. 76.1–3 (♂ ♀); Chen and Gao 1990: 73, fig. 92 a – c (♂ ♀); Chen and Zhang 1991: 91, fig. 82.1–3 (♂ ♀); Zhao 1993: 262, fig. 123 a, b (♂ ♀); Zhao 1995: 979, fig. 462 a, b (♂ ♀); Yin et al. 1997: 395, fig. 286 a – d (♂ ♀); Song et al. 1999: 309, figs 184 G – I, 185 L (♂ ♀); Namkung 2002: 303, fig. 19.64 a, b (♂ ♀); Kim and Kim 2002: 225, figs 69, 155, 288, 289 (♂ ♀); Kim and Cho 2002: 270, figs 685–690 (♀); Namkung 2003: 305, fig. 19.64 a, b (♂ ♀); Tanikawa 2007: 93, figs 299, 300, 760–763 (♂ ♀); Tanikawa 2009: 463, figs 331–334 (♂ ♀); Zhu and Zhang 2011: 248, fig. 179 A – D (♂ ♀); Yin et al. 2012: 762, fig. 381 a – e (♂ ♀); Kim and Lee 2012: 109, fig. 81 A – C, plate 24 (♂ ♀); Baba and Tanikawa 2015: 69, 4 fig. (♂ ♀).

Material examined.

China – Guizhou Province • 2 ♂♂ 4 ♀♀; Tongren City, Shiqian County, Pingshan Township, Fodingshan Village, Yaoshang ; 27 ° 20.54 ' N, 108 ° 9.50 ' E; ca 640 m elev.; 11. VII. 2017; X. Q. Mi et al. leg.; TRU - Araneidae -344 –349 • 2 ♂♂ 24 ♀♀; Tongren City, Bijiang District, Chuangdong Township, around campus of Tongren University ; 27 ° 46.66 ' N, 109 ° 13.00 ' E; ca 570 m elev.; 7–15. VII. 2017; L. F. Chen et al. leg.; TRU - Araneidae -350 –375 • 3 ♂♂ 10 ♀♀; Qiandongnan Miao and Dong Autonomous Prefecture, Shibing County, Baiduo Township, Baiduo Village, Heichong ; 27 ° 9.37 ' N, 108 ° 7.40 ' E; ca 980 m elev., 20. VII. 2019; X. Q. Mi et al. leg.; TRU - Araneidae -376 –388 • 4 ♂♂ 2 ♀♀; Zunyi City, Huichuan District, Banqiao Township, Loushanguan Village ; 27 ° 58.06 ' N, 106 ° 53.20 ' E; ca 920 m elev.; 17. VII. 2024; X. Q. Mi leg.; TRU - Araneidae -389 –394 . – Hubei Province • 4 ♂♂ 12 ♀♀; Wuhan City, Hongshan District, Ma’anshan Forest Park ; 30 ° 31.65 ' N, 114 ° 26.12 ' E; ca 30 m elev.; 3. VI. 2018; X. Q. Mi leg.; TRU - Araneidae -395 –410 .

Diagnosis.

This species resembles Y. medog Mi & Wang , sp. nov. in appearance and genitalia structures, but it can be distinguished as follows: 1) median apophysis with a projection on middle part (Fig. 6 A, C – E ) vs lacking (Fig. 2 A, C – E ); 2) median apophysis curled about 45 ° in ventral view (Fig. 6 C ) vs about 90 ° (Fig. 2 C ); 3) copulatory openings almost rounded in ventral view (Fig. 5 A, B ) vs arcuate (Fig. 1 A ); and 4) diameter of spermathecae about 1 / 4 width of epigynal base (Fig. 5 D ) vs about 2 / 5 width of epigynal base (Fig. 1 D ).

Description.

Male ( TRU - Araneidae -350 , Figs 5 H – J , 6 ). Total length 6.30. Carapace 3.30 long, 2.50 wide. Abdomen 3.70 long, 2.60 wide. Clypeus 0.08 high. Eye sizes and interdistances: AME 0.18, ALE 0.10, PME 0.13, PLE 0.10, AME – AME 0.15, AME – ALE 0.28, PME – PME 0.05, PME – PLE 0.45, MOA length 0.48, anterior width 0.48, posterior width 0.30. Leg measurements: I 13.30 (3.70, 5.10, 3.20, 1.30), II 11.60 (3.20, 4.20, 3.00, 1.20), III 6.50 (2.10, 2.10, 1.50, 0.80), IV 9.10 (2.70, 3.30, 2.20, 0.90). Carapace dark brown in cephalic region and yellowish-brown in thoracic region. Cervical groove conspicuous. Chelicerae dark brown, with four promarginal and three retromarginal teeth. Endites and labium dark brown at base, with paler tip. Sternum yellowish-brown. Legs yellow with brown annuli. Abdomen ~ 1.42 × longer than wide, dorsal grayish-brown with paler edges. Venter abdomen grayish-yellow with pair of lateral white patches. Spinnerets grayish-yellow.

Pedipalp (Fig. 6 ): tibia ~ 1.96 × longer than wide in ventral view; paracybium enlarged at base, lobe-like distally; tegular projection triangular, with serrated edge; median apophysis wide at base, with projection at middle part, tapered and curled distally; embolus slightly curled, shorter than conductor; conductor membranous, longer than wide; terminal apophysis with weakly sclerotized distal portion, about equal length to tegular projection.

Female ( TRU - Araneidae -351 , Fig. 5 A , TRU - Araneidae -352 , Fig. 5 B – G ). Total length 7.00. Carapace 3.00 long, 2.80 wide. Abdomen 4.30 long, 3.30 wide. Clypeus 0.08 high. Eye sizes and interdistances: AME 0.18, ALE 0.10, PME 0.13, PLE 0.10, AME – AME 0.15, AME – ALE 0.25, PME – PME 0.05, PME – PLE 0.45, MOA length 0.45, anterior width 0.45, posterior width 0.30. Leg measurements: I 11.90 (3.40, 4.40, 3.00, 1.10), II 10.30 (3.00, 3.80, 2.50, 1.00), III 6.20 (2.00, 2.20, 1.30, 0.70), IV 8.90 (2.80, 3.20, 1.90, 1.00). Habitus similar to that of male.

Epigyne (Fig. 5 A – D ): ~ 1.55 × wider than long in ventral view, with heart-shaped scape; copulatory openings rounded, situated on ventral surface; copulatory ducts twisted, a bit longer than spermathecal diameter; spermathecae rounded, touching.

Variation.

Total length: ♂♂ 5.60–8.20 (N = 15); ♀♀ 5.80–13.10 (N = 52). Scape torn off in most individuals.

Distribution.

China (Anhui, Fujian, Guangdong, Guangxi, Guizhou, Henan, Hubei, Hunan, Jiangsu, Shaanxi, Shandong, Sichuan, Taiwan, Xinjiang, Zhejiang), Korea, Japan.

Figures

Figure 1. Yaginumia medog Mi & Wang, sp. nov. A – G female paratype TRU - Araneidae - 327 H – J male holotype A epigyne, ventral view B ibid., posterior view C vulva, posterior view D ibid., dorsal view E, H habitus, dorsal view F, I ibid., ventral view G, J ibid., lateral view. Abbreviations: CD copulatory duct, CO copulatory opening, FD fertilization duct, Sp spermatheca. Scale bars: 0.1 mm (A – D); 1.0 mm (E – J).

Figure 2. Yaginumia medog Mi & Wang, sp. nov. male holotype A pedipalp, prolateral view B ibid., retrolateral view C ibid., ventral view D ibid., apical view E part of expanded bulb. Scale bars: 0.1 mm. Abbreviations: C conductor, E embolus, MA median apophysis, Pc paracymbium, TA terminal apophysis, TP tegular projection.

Figure 5. Yaginumia sia (Strand, 1906) A TRU - Araneidae - 351 B – G TRU - Araneidae - 352 H – J TRU - Araneidae - 350 A epigyne (scape torn off), ventral view B ibid, ventral view C ibid., posterior view D vulva, posterior view E, H habitus, dorsal view F, I ibid., ventral view G, J ibid., lateral view. Abbreviations: CD copulatory duct, CO copulatory opening, FD fertilization duct, Sc scape, Sp spermatheca. Scale bars: 0.1 mm (A – D); 1.0 mm (E – J).

Figure 6. Yaginumia sia (Strand, 1906) TRU - Araneidae - 350 A pedipalp, prolateral view B ibid., retrolateral view C ibid., ventral view D ibid., apical view E part of expanded bulb. Abbreviations: C conductor, E embolus, MA median apophysis, Pc paracymbium, TA terminal apophysis, TP tegular projection. Scale bars: 0.5 mm (A – C), 0.1 mm (D, E).

Figure 7. Distribution in China of the examined specimens of Yaginumia.