Spinirta sparsula, 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 : 310-317

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.4458084
persistent identifier	https://treatment.plazi.org/id/F86787F2-FF82-FF86-25C0-C92A7C7711EE
treatment provided by	Plazi
scientific name	Spinirta sparsula
status	sp. nov.

Treatment

Spinirta sparsula View in CoL sp. nov. (ẅḦẊĦ)

Figs 2 View FIGURE 2 A–C, 3C, 11–13

Type material. Holotype: ♂, CHINA: Hunan Province, Sangzhi County, Bamaoxi Township, Xiaozhuangping Village , Tianping Mountain (29°47.157′N, 110°05.841′E), 1330 m a.s.l., 15 September 2015, leg. Chi Jin, Xiangbo Guo & Jingchao He. GoogleMaps Paratypes: 1♀, same data as holotype GoogleMaps .

Etymology. The specific name is from the Latin word sparsula , meaning “sparse”, referring to the sparse spines on the ventral surface of the RTA.

Diagnosis. The male can be distinguished from other congeners by: 1) RTA with a digitiform apex and kidneyshaped protrusion at the base ( Figs 12C, F View FIGURE 12 ), and 2) ventral surface of RTA only with a few slender spines ( Fig. 12F View FIGURE 12 ). The female resembles S. qiaoliaoensis ( Lu & Chen, 2019) comb. nov. in having a similar atrium formed by the incomplete fusion of two enlarged COs ( Fig. 12G View FIGURE 12 ; Lu et al. 2019: fig. 2D), but can be distinguished from it by: 1) the posterior margin of the atrium closer to the margin of the epigyne than in S. qiaoliaoensis ( Fig. 12G View FIGURE 12 ; Lu et al. 2019: fig. 2D), and 2) the distance between the spermathecae is obviously larger than that in S. qiaoliaoensis ( Fig. 12H View FIGURE 12 ; Lu et. al. 2019: fig. 2C).

Description. Male ( Figs 2 View FIGURE 2 A–C, 3C, 11A–D, 12A–F, 13A–D). Holotype: body 9.60 long: carapace 4.77 long, 3.76 wide, width: length= 0.79; abdomen 4.83 long, 3.34 wide. Diameters of eyes: AME 0.28, ALE 0.24, PME 0.28, PLE 0.26. Eye interdistances: AME–AME 0.15, AME–ALE 0.10, ALE–ALE 0.96, PME–PME 0.25, PME–PLE 0.33, PLE–PLE 1.40, ALE–PLE 0.16. OAW 1.62, CRW 2.31, OAW/CRW = 0.70. CRW/carapace width = 0.61. MOA 0.63 long, front width 0.70, back width 0.72. Clypeus height 0.33, 1.18 times AME diameter. Chelicerae with three promarginal teeth and five retromarginal teeth. Labium 0.81 long, 0.66 wide. Sternum 2.21 long, 1.99 wide. Measurements of legs: leg I 13.63 (3.84 + 1.65 + 3.26 + 3.05 + 1.83), II 12.78 (3.70 + 1.56 + 3.07 + 2.81 + 1.64), III 11.20 (3.13 + 1.46 + 2.44 + 2.69 + 1.48), IV 14.94 (3.95 + 1.58 + 3.57 + 4.20 + 1.64).

Palp as illustrated ( Figs 3C View FIGURE 3 , 12 View FIGURE 12 A–F, 13A–D). Tibial ventral protrusion digitiform, with blunt apex. RTA with digitiform apex and kidney-shaped protrusion at base; ventral surface only with few slender spines. PTA triangular. Tegulum retrolateral apex low and round. Subtegulum with two transverse grooves on prolateral surface. Embolus with round extension on retrolateral side, with short, spine-like tip; embolar apophysis with truncated tip, with obvious file-like grooves on surface.

Female ( Figs 11 View FIGURE 11 E–H, 12G, H, 13E, F). Paratype: body 11.08 long: carapace 4.56 long, 3.53 wide, width: length = 0.77; abdomen 6.52 long, 4.94 wide. Diameters of eyes: AME 0.25, ALE 0.20, PME 0.23, PLE 0.24. Eye interdistances: AME–AME 0.19, AME–ALE 0.10, ALE–ALE 0.90, PME–PME 0.19, PME–PLE 0.28, PLE–PLE 1.25, ALE–PLE 0.14. OAW 1.52, CRW 2.15, OAW: CRW/0.71. CRW/carapace width = 0.61. MOA 0.51 long, front width 0.66, back width 0.72. Clypeus height 0.29, 1.16 times AME diameter. Chelicerae with three promarginal teeth and five retromarginal teeth. Labium 0.69 long, 0.68 wide. Sternum 2.09 long, 1.90 wide. Measurements of legs: leg I 12.72 (3.53 + 1.57 + 3.12 + 2.82 + 1.68), II 12.00 (3.49 + 1.42 + 2.84 + 2.70 + 1.55), III 10.49 (2.94 + 1.26 + 2.34 + 2.62 + 1.33), IV 14.44 (3.91 + 1.52 + 3.43 + 3.94 + 1.64).

Epigyne weakly sclerotized, likely because specimen had recently moulted before being collected ( Figs 12G View FIGURE 12 , 13E View FIGURE 13 ): anteriorly with an atrium formed by incomplete fusion of two enlarged oval COs. Vulva ( Figs 12H View FIGURE 12 , 13F View FIGURE 13 ): copulatory ducts anteriorly inflated, running apart backward, anteriorly with large membranous parts; accessory glands small, oval; spermathecae separated by more than spermatheca’s width.

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