Atypus dawei Li & Xu sp. nov.

Figs 1, 2, 3

Type material.

Holotype: China • ♂; Hunan Province, Liuyang City, Mount Dawei, Wuzhi Summit; 28.41 ° N, 114.11 ° E; alt. 1200 m; 13 May 2016; X. Xu leg.; LY 001 .

Paratypes: China • 2 ♀♀; same data as for holotype, alt. 740 m; 4–6 May 2022; ATY-2022-001, 002 – Jiangxi Province • 1 ♀; Shangrao City, Guangxin District, Zhengfang Town, Lou Village; 28.69 ° N, 117.90 ° E; alt. 131 m; 30 August 2023; ATY-2023-181 • 1 ♀; Shangrao City, Dexing City, Raoer Town, Damaoshan Scenic Area; 28.84 ° N, 117.72 ° E; alt. 185 m; 30 August 2023; ATY-2023-189 • 1 ♀; Shangrao City, Dexing City, Fenghuanghu Scenic Area; 28.92 ° N, 117.60 ° E; alt. 74 m; 31 August 2023; ATY-2023-192 • 2 ♀♀; Shangrao City, Wuyuan County, Xucun Town, Fenshui Village; 29.22 ° N, 117.61 ° E; alt. 84–92 m; 1 September 2023; ATY-2023-193, 195 • 2 ♀♀; Jingdezhen City, Fuliang County, Jinggongqiao Town; 29.70 ° N, 117.22 ° E; alt. 92 m; 2 September 2023; ATY-2023-204, 207 – Anhui Province, Chizhou City, Dongzhi County • 1 ♀; Muta Town, Hengshan Village; 29.79 ° N, 117.07 ° E; alt. 122 m; 2 September 2023; ATY-2023-209 • 2 ♀♀; Guangang Town, Huangjialong Village; 29.85 ° N, 117.05 ° E; alt. 125 m; 2 September 2023; X. Xu, Y. Zhang, Y. X. Li, J. Y. Yuan leg.; ATY-2023-212, 213 .

Diagnosis.

The male palp of A. dawei sp. nov. resembles that of A. flexus Zhu, Zhang, Song & Qu, 2006 by having the embolus with thick, slightly curved base, but it can be distinguished from the latter by the larger, narrower conductor in prolateral view (Fig. 2 G), and from that of A. liui sp. nov. by slightly curved and thicker base of the embolus, parallel to conductor (Fig. 2 J, K) and by the smaller conductor (Fig. 2 G – K). Female genitalia of A. dawei sp. nov. resemble those of A. suiningensis Zhang, 1985 and A. liui sp. nov. in having almost two equal-sized pairs of receptacula, but the new species can be distinguished from A. suiningensis by its nearly rectangular genital atrium, and from A. liui sp. nov. by the shorter stalks (Fig. 3 A – F).

Description.

Male (holotype; Fig. 1 F). TL (including chelicerae) 10.07. CL 3.82, CW 3.87, AL 3.41, AW 2.12. Carapace reddish brown. Fovea transverse with radial grooves, occupying about 1 / 7 of carapace width at that point (Fig. 2 A). Eye diameter: AME 0.28, ALE 0.19, PME 0.16, PLE 0.07, AME – AME 0.10, AME – ALE 0.14, PME – PME 0.62, PME – PLE 0.05. MOA 0.50, front width 0.66, back width 0.88. Labium wider than long. Sternum yellowish brown, 2.49 long, 2.62 wide. Sigilla deeply imprinted, first pair close to anterior margin of sternum; posterior pair much larger and oval (Fig. 2 B). Chelicerae reddish brown, with 12 teeth in a single row (Fig. 2 C). Abdomen blackish brown with dorsal scutum light yellow. Legs slender and light yellow. Palpal femur with shallow furrow. Only femur I with granular texture on the prolateral side. Metatarsus IV with two dorsal spines. Leg measurements: leg I 13.15 (4.15, 1.58, 2.25, 3.10, 2.07), leg II 11.06 (3.45, 1.54, 1.74, 2.55, 1.78), leg III 10.00 (2.73, 1.39, 1.52, 2.48, 1.88), leg IV 13.46 (3.69, 1.52, 2.13, 3.58, 2.54).

Palp. Half-rounded conductor with an excurved distal edge (Fig. 2 I – K); thick base of embolus slightly curved, and embolus parallel to conductor (Fig. 2 G – K).

Female (ATY-2023-212; Fig. 1 E). TL (including chelicerae) 16.27. CL 4.92, CW 4.86, AL 7.67, AW 5.13. Carapace reddish brown. Fovea transverse, occupying about 1 / 7 of carapace width at that point (Fig. 2 D). Eye region black. Eye diameters: AME 0.24, ALE 0.20, PME 0.21, PLE 0.16, AME – AME 0.26, AME – ALE 0.24, PME – PME 0.91, PME – PLE 0.07. MOA 0.51, front width 0.70, back width 1.47. Sternum orange-brown, 4.34 long, 3.86 width, with dense covering of hairs. Sigilla larger than that in male, second pair smallest, fourth pair largest (Fig. 2 E). Chelicerae reddish brown, with 14 teeth in a single row (Fig. 2 F). Abdomen dark brown in oval, with an oval dorsal scutum in the anterior part. ALS 0.62 long, PMS 1.12 long, PLS four-segments as follows: basal 0.77, median 0.81, subapical 0.96, apical 1.09. Legs yellowish brown, with a dense covering of long hairs; all metatarsus with dorsal spines; metatarsus IV with six dorsal spines. Leg measurements: Leg I 11.35 (4.19, 2.04, 1.74, 2.08, 1.30), Leg II 9.02 (2.94, 2.06, 1.35, 1.58, 1.09), Leg III 7.36 (2.04, 1.66, 1.19, 1.53, 0.94), Leg IV 10.39 (3.62, 1.75, 1.52, 2.20, 1.30).

Vulva. Genital atrium short, wider than long, with oval lateral pore patches; two pairs of pyriform receptacula similar in size, with short stalks (Fig. 3 A – F).

Variation.

Females exhibit variation in body size and the number of cheliceral teeth. Measurements for females (N = 12) are as follows: TL 8.92–16.72, CL 3.13–4.92, CW 2.88–4.86, AL 3.61–7.67, AW 2.51–5.13. The number of cheliceral teeth ranges from 10 to 14 (N = 12). In addition, the female genitalia show intraspecific variation. The middle pair of receptacula are positioned either on the ventral side of the genitalia atrium (Fig. 3 A, E, F) or near the anterior margin of the genitalia atrium (Fig. 3 B – D).

Etymology.

The species epithet, a noun in apposition, refers to the type locality.

Distribution.

China (Anhui, Hunan, Jiangxi).