Spinirta forcipata Jin & Zhang 2020, sp. nov.
Creators: name: Jin, Chi
name: Zhang, Feng
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Araneae
Corinnidae
Spinirta
Spinirta forcipata

description: Spinirta forcipata sp. nov. (ṘḦẊĦ)
Figs 1C, 3B, 8–10
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. Paratypes: 1♀, same data as holotype.
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), whereas it is concave in S. aurita sp. nov. (Fig. 14G); 2) palpal tibia ventral protrusion digitiform, and apex with a laminate modification (Figs 9C, F), whereas it is slightly raised as a low hump in S. aurita sp. nov. (Figs 14E, H). The female resembles S. jinyunshanensis sp. nov., for detailed diagnosis see above.
Description. Male (Figs 3B, 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, 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, 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, 10E): copulatory openings kidney-shaped, separated and parallel to each other. Vulva (Figs 9H, 10F): 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).
description: Published as part of Jin, Chi & Zhang, Feng, 2020, Spinirta gen. nov., a new dark sac spider genus from southern China (Araneae: Corinnidae), pp. 301-330 in Zootaxa 4838 (3) on page 310, DOI: 10.11646/zootaxa.4838.3.1, http://zenodo.org/record/4403970