Spinirta forcipata, Jin & Zhang, 2020

Jin, Chi & Zhang, Feng, 2020, Spinirta gen. nov., a new dark sac spider genus from southern China (Araneae: Corinnidae), Zootaxa 4838 (3), pp. 301-330 : 310

publication ID	https://doi.org/ 10.11646/zootaxa.4838.3.1
publication LSID	lsid:zoobank.org:pub:112D4DC3-723A-4216-A608-3D03B392E973
DOI	https://doi.org/10.5281/zenodo.4404463
persistent identifier	https://treatment.plazi.org/id/F86787F2-FF82-FF9F-25C0-CFA67CB915FF
treatment provided by	Plazi
scientific name	Spinirta forcipata
status	sp. nov.

Treatment

Spinirta forcipata View in CoL sp. nov. (ṘḦẊĦ)

Figs 1C View FIGURE 1 , 3B View FIGURE 3 , 8–10 View FIGURE 8 View FIGURE 9 View FIGURE 10

Type material. Holotype: ♂, CHINA: Chongqing Municipality: Wanzhou, Wangerbao Mountain (30°39.498′N, 108°43.878′E), 1231 m a.s.l., 10 August 2012, leg. Luyu Wang. GoogleMaps Paratypes: 1♀, same data as holotype GoogleMaps .

Etymology. The specific name is from the Latin word forcipata meaning “forceps-like”, referring to the shape of the male palpal embolus.

Diagnosis. The male resembles S. aurita sp. nov. in having long, sharp lateral and main embolar branches, but can be distinguished from it by: 1) the retrolateral edge of RTA is not concave in the middle ( Fig. 9B View FIGURE 9 ), whereas it is concave in S. aurita sp. nov. ( Fig. 14G View FIGURE 14 ); 2) palpal tibia ventral protrusion digitiform, and apex with a laminate modification ( Figs 9C, F View FIGURE 9 ), whereas it is slightly raised as a low hump in S. aurita sp. nov. ( Figs 14E, H View FIGURE 14 ). The female resembles S. jinyunshanensis sp. nov., for detailed diagnosis see above.

Description. Male ( Figs 3B View FIGURE 3 , 8 View FIGURE 8 A–D, 9A–F, 10A–D). Holotype: body 10.18 long; carapace 5.36 long, 4.10 wide, width: length = 0.76; abdomen 4.82 long, 3.24 wide. Diameters of eyes: AME 0.34, ALE 0.26, PME 0.27, PLE 0.28. Eye interdistances: AME–AME 0.17, AME–ALE 0.13, ALE–ALE 1.11, PME–PME 0.32, PME–PLE 0.36, PLE–PLE 1.52, ALE–PLE 0.11. OAW 1.83, CRW 2.57, OAW/CRW= 0.71. CRW: carapace width = 0.63. MOA 0.64 long, front width 0.79, back width 0.83. Clypeus height 0.38, 1.12 times AME diameter. Chelicerae with three promarginal teeth and five retromarginal teeth. Labium 0.86 long, 0.77 wide. Sternum 2.34 long, 2.14 wide. Measurements of legs: leg I 14.03 (3.91 + 1.75 + 3.33+ 3.09 + 1.95), II 13.47 (3.86 + 1.71 + 2.97+ 3.10 + 1.83), III 11.34 (3.20 + 1.55 + 2.35 + 2.69 + 1.55), IV 15.21(4.10 + 1.65 + 3.55 + 4.25 + 1.66).

Palp as illustrated ( Figs 3B View FIGURE 3 , 6 View FIGURE 6 A–F, 7A–D). Tibial ventral protrusion digitiform, apex with laminate modification. RTA outer edge oval; ventral surface with dense, thick, relatively long scimitar-like spines. PTA triangular. Tegulum retrolateral apex round. Subtegulum with several staggered grooves on prolateral surface. Embolus and embolar apophysis both long and sharp, straight in ventral view; embolar apophysis with tiny file-like grooves on surface.

Female ( Figs 1C View FIGURE 1 , 8 View FIGURE 8 E–H, 9G, H, 10E, F). Paratype: body 12.31 long; carapace 5.22 long, 4.13 wide, width: length = 0.79; abdomen 7.09 long, 4.59 wide. Diameters of eyes: AME 0.30, ALE 0.25, PME 0.27, PLE 0.27. Eye interdistances: AME–AME 0.21, AME–ALE 0.17, ALE–ALE 1.10, PME–PME 0.29, PME–PLE 0.35, PLE–PLE 1.55, ALE–PLE 0.14. OAW 1.88, CRW 2.68, OAW/CRW= 0.70. CRW/carapace width = 0.65. MOA 0.65 long, front width 0.79, back width 0.83. Clypeus height 0.30, 1.00 times AME diameter. Chelicerae with three promarginal teeth and five retromarginal teeth. Labium 0.86 long, 0.78 wide. Sternum 2.43 long, 2.12 wide. Measurements of legs: leg I 13.8(3.89 + 1.86 + 3.25 + 2.95 + 1.85), II 13.16(3.75 + 1.81 + 2.92 + 2.92 + 1.76), III 11.51 (3.30 + 1.60 + 2.42 + 2.65+ 1.54), IV 15.64 (4.30 + 1.73 + 3.68 + 4.29 + 1.64).

Epigyne ( Figs 9G View FIGURE 9 , 10E View FIGURE 10 ): copulatory openings kidney-shaped, separated and parallel to each other. Vulva ( Figs 9H View FIGURE 9 , 10F View FIGURE 10 ): copulatory ducts thick, running parallel backward, anteriorly with large membranous parts; accessory glands small, spherical; spermathecae separated by less a spermatheca’s diameter.

Distribution. China (Chongqing) ( Fig. 26 View FIGURE 26 ).