Stenohya gibba sp. nov.

Figs 1, 2, 3, 4, 5, 6 Chinese name. 驼峰狭伪蝎

Type material.

Holotype male (Ps. - MHBU - HN 2023111901), China: Hunan Province, Suining County, Huangsang Nature Reserve in Nanshan National Park [26 ° 24 ' 32 " N, 110 ° 05 ' 38 " E], 460 m a. s. l., 19 November 2023, in leaf litter (Fig. 2 C, D), Jiaqi Zhao, Jianzhou Sun, Tao Zheng & Songtao Shi leg. Paratypes: three males (Ps. - MHBU - HN 2023111902–04), four females (Ps. - MHBU - HN 2023013105–08), same data as for holotype.

Etymology.

The specific name is derived from the Latin word “ gibbus ”, meaning hump-shaped, which refers to the shape of the projections on the basitarsus and telotarsus of the male leg I.

Diagnosis.

Carapace with four well-developed eyes, epistome triangular (Figs 3 A, 4 A, 5 A, 6 A). Male pedipalpal trochanter with a process and small frosted projections on the prolateral position (Figs 3 G, 4 E); femur with three projections (Figs 3 G, 4 E); patella with a small projection medially on the prolateral position (Figs 3 G, 4 E); chelal hand concaved distally at the dorsal side, with 15–18 small, triangular apophyses on the dorsal side, extending into the dorsal face of fixed finger (Figs 3 H, 4 C). Male leg I specialized, femur and patella enlarged, basitarsus and telotarsus semi-fused, the dividing line between the two limb segments visible, basitarsus and telotarsus each with a large columnar projection laterally (Figs 3 I, K, 4 F – H). Female pedipalpal movable chelal finger with 79–87 teeth; female pedipalpal chela (with pedicel) 4.67–4.98 times longer than wide.

Description.

Adult male (holotype and male paratypes) (Figs 1 A, 2 A).

Carapace (Figs 3 A, 4 A). Carapace 1.30–1.36 times longer than broad, with a total of 30–32 setae, including six near anterior margin and 6–7 near posterior margin; eight lyrifissures near the eyes, four lyrifissures near posterior margin; epistome small, triangular, with rounded top; with four corneate eyes. Carapace divided into three parts by two transverse, shallow grooves, the anterior part uplifted, the median part smooth, the posterior part uplifted, and with microgrooves.

Chelicera (Figs 3 B, 4 B). Hand with 6–7 setae and two lyrifissures, movable finger with one seta; fixed finger with 13–15 teeth; movable finger with 7–9 teeth; serrula exterior with 44–46 lamellae; serrula interior with 36–37 lamellae; galea developed, divided into two main branches, one branch five, while the other two (Fig. 3 D); rallum consisting of 7–8 blades, all with anteriorly directed spinules, the basal-most blade shortest (Fig. 3 C).

Pedipalps (Figs 3 G, H, 4 C, E). Apex of pedipalpal coxa rounded, with seven long setae. Trochanter with a process on the median prolateral position, as well as some small frosted projections; femur with a curved cylindrical process on the median prolateral position, as well as a projection on the subdistal prolateral surface, and with a columnar process adjacent to this projection; patella with a small projection on the median prolateral position and two lyrifissures (Figs 3 G, 4 E); chelal hand deeply concaved at the dorsal side of distal half, with 15–18 small, triangular, spinous apophyses arranged in a row on the dorsal side, each spinous apophysis with a seta at the base, a few spinous apophyses extended into the dorsal face of fixed finger. On the posterior side, several small granular processes located at the distal of the hand and near the base of the fixed finger, at the ventral of the hand from the distal to two-thirds with shallow invagination. Fixed chelal finger slightly curved upward at median to distal part (Figs 3 H, 4 C). Trochanter 1.46–1.65, femur 3.96–4.37, patella 3.47–3.71, chela with pedicel 3.98–4.16, chela without pedicel 3.71–3.89 times longer than broad, movable finger 1.98–2.35 times longer than hand without pedicel. Fixed chelal finger with eight, movable chelal finger with four trichobothria: eb and esb situated on the base of hand, grouped very closely with ib and isb; est, et and it grouped distally; ist closer to est - et - it than to isb - ib - esb - eb in fixed chelal finger; b and sb situated closer to each other in basal half, st and t close to each other in distal half of movable finger. Venom apparatus present only in fixed chelal finger, venom duct short. Fixed chelal finger with 117 pointed teeth, movable finger with 103–108 teeth, 47–51 rounded teeth at base, and 56–57 pointed teeth at distal position.

Abdomen. Pleural membrane granulated. Tergites and sternites undivided, tergal chaetotaxy (I – XI): 4–5: 7–8: 7–11: 9–10: 9–10: 10–12: 11–12: 11–12: 11–12: 12: 11, sternal chaetotaxy (IV – XI): 22–28: 21–24: 19–24: 18–19: 19: 17–19: 12–15: 4, sternites VI – VIII with 3–6 medial scattered glandular setae, anal cone with two dorsal and two ventral setae. Genital area (Figs 3 F, 4 D): anterior genital sternite with 75–80 setae and two lyrifissures; posterior genital sternite with 55–59 setae and two lyrifissures.

Legs (Figs 3 I – K, 4 F – I). Leg I specialized, femur and patella enlarged, basitarsus and telotarsus semi-fused, the dividing line between the two limb segments visible, basitarsus and telotarsus each with a large columnar projection on the lateral side (Figs 3 I, K, 4 F – H), femur with three lyrifissures. Leg IV generally typical, long, and sinewy, trochanter with three lyrifissures (Figs 3 J, 4 I). Leg I: trochanter 1.40–1.55, femur 2.06–2.24, patella 2.61–3.27, tibia 3.25–3.43, basitarsus 2.31–2.52, telotarsus 2.52–2.89 times longer than deep. Leg IV: trochanter 2.23–2.73, femur + patella 4.08–4.72, tibia 6.96–7.52, basitarsus 4.19–4.38, telotarsus 6.67–7.15 times longer than deep; tibia with two submedial tactile setae (TS = 0.60–0.67, 0.96), basitarsus with two tactile setae (TS = 0.12–0.14, 0.82–0.83), telotarsus with two tactile setae (TS = 0.20, 0.55–0.58); subterminal tarsal seta bifurcate (Fig. 3 E). Arolium not divided, shorter than the slender and simple claws.

Adult female (paratype females) (Figs 1 B, 2 B): mostly same as males, except where noted.

Carapace (Figs 5 A, 6 A). Carapace 1.02–1.19 times longer than broad, with a total of 29–30 setae, including six near anterior margin and 4–5 near posterior margin; ten lyrifissures near the eyes, five lyrifissures near posterior margin; the front half of carapace uplifted, the back half smooth and with triangular invagination at 1 / 3 and 2 / 3 positions.

Chelicera (Figs 5 B, 6 B). Fixed finger with 14–15 teeth; movable finger with 6–7 teeth; serrula exterior with 45–51 lamellae; serrula interior with 38–40 lamellae; galea divided into two main branches, one branch five, while the other three (Fig. 5 D); rallum consisting of 8–9 blades, all with anteriorly directed spinules, the basal-most blade shortest (Fig. 5 C).

Pedipalps (Figs 5 G, H, 6 C, E). Apex of pedipalpal coxa with six long setae. Femur with a few tubercles prolaterally. Trochanter 1.87–1.94, femur 4.56–4.80, patella 3.15–3.71, chela with pedicel 4.67–4.98, chela without pedicel 3.94–4.14 times longer than broad, movable finger 1.60–1.72 times longer than hand without pedicel. Fixed chelal finger with 99–100 pointed teeth, movable finger with 79–87 teeth, 39–44 rounded teeth at base, and 40–43 pointed ones.

Abdomen. Tergal chaetotaxy (I – XI): 3–5: 7–8: 8–10: 9–10: 11: 10–11: 10–13: 11–12: 11–12: 11–13: 8–10, sternal chaetotaxy (IV – XI): 22–24: 21–24: 18–20: 18–20: 16–18: 16–18: 13–14: 4–6, sternites VI – VIII with two medial scattered glandular setae; genital area (Figs 5 F, 6 D): sternite II with total of 29–34 setae and two lyrifissures; sternite III with a row of 31–34 setae and two lyrifissures along posterior margin.

Legs (Figs 5 I, J, 6 F, G). Leg I: trochanter 1.25–1.37, femur 3.64–3.96, patella 3.00–3.45, tibia 3.79–4.56, basitarsus 3.29–4.00, telotarsus 4.77–4.85 times longer than deep. Leg IV: trochanter 2.55–2.79, femur + patella 4.30–4.72, tibia 6.68–7.29, basitarsus 3.93–4.40, telotarsus 6.53–6.79 times longer than deep; tibia with two submedial tactile setae (TS = 0.22–0.29, 0.72–0.76), basitarsus with two tactile setae (TS = 0.12–0.13, 0.80), telotarsus with two tactile setae (TS = 0.20–0.22, 0.59).

Measurements

(in mm; length / breadth or, for legs, length / depth). Male (holotype and paratypes). Body length 4.55–5.30. Carapace 1.84–1.90 / 1.40 – 1.42. Pedipalpal trochanter 0.76–0.86 / 0.48 – 0.57, femur 1.82–2.01 / 0.46, patella 1.56–1.67 / 0.45 – 0.46, chela with pedicel 3.80–3.87 / 0.92 – 0.99, chela without pedicel 3.58–3.67 / 0.92 – 0.99, hand without pedicel length 1.15–1.30, movable finger length 2.58–2.70. Leg I: trochanter 0.56–0.59 / 0.38 – 0.40, femur 1.03–1.14 / 0.50 – 0.52, patella 0.92–1.08 / 0.33 – 0.36, tibia 0.78–0.83 / 0.23 – 0.25, basitarsus 0.53–0.60 / 0.21 – 0.26, telotarsus 0.55–0.58 / 0.19 – 0.23. Leg IV: trochanter 0.69–0.81 / 0.26 – 0.31, femur + patella 1.63–1.84 / 0.39 – 0.40, tibia 1.58–1.64 / 0.21 – 0.23, basitarsus 0.64–0.70 / 0.15 – 0.16, telotarsus 0.93–1.00 / 0.13 – 0.15.

Female (paratypes). Body length 4.45–5.65. Carapace 1.48–1.64 / 1.24 – 1.55. Pedipalpal trochanter 0.83–0.91 / 0.43 – 0.47, femur 1.96–2.06 / 0.41 – 0.44, patella 1.45–1.66 / 0.41 – 0.48, chela with pedicel 3.56–3.72 / 0.84 – 0.90, chela without pedicel 3.38–3.55 / 1.39 – 1.52, hand without pedicel length 1.27–1.37, movable finger length 2.17–2.30. Leg I: trochanter 0.41–0.46 / 0.30 – 0.36, femur 0.95–1.02 / 0.24 – 0.28, patella 0.66–0.78 / 0.22 – 0.24, tibia 0.72–0.82 / 0.18 – 0.19, basitarsus 0.46–0.60 / 0.14 – 0.15, telotarsus 0.58–0.63 / 0.12 – 0.13. Leg IV: trochanter 0.74–0.87 / 0.29 – 0.34, femur + patella 1.74–1.85 / 0.38 – 0.43, tibia 1.47–1.56 / 0.21 – 0.22, basitarsus 0.59–0.70 / 0.15 – 0.16, telotarsus 0.95–0.98 / 0.14 – 0.15.

Distribution.

China (Hunan).

Remarks.

The male of this new species differs from all other species of the genus Stenohya by the presence of a large columnar projection on the lateral side of basitarsus and telotarsus. The female can be distinguished from other Stenohya species reported from China by the presence of 79–87 teeth on pedipalpal movable chelal finger (115–118 in S. arcuatа; 68 in S. bomica; 96–98 in S. hainanensis; 46–51 in S. huangi; 45–55 in S. pengae), the pedipalpal chela with pedicel 4.67–4.98 times longer than wide (4.20 in S. bicornuta; 4.19–4.37 in S. curvata; 4.16–4.27 in S. hainanensis; 3.56 in S. meiacantha; 4.09–4.25 in S. pengae; 4.02–4.10 in S. spinata; 3.44–4.50 in S. tengchongensis) (Zhao and Zhang 2011; Zhao et al. 2011; Hu and Zhang 2012; Yang and Zhang 2013; Guo and Zhang 2016; Guo et al. 2019; Zhan et al. 2023).