Stenohya biverticis Zhao, Guo & Zhang, 2025

Zhao, Jiaqi, Guo, Xiangbo, Gao, Zhizhong & Zhang, Feng, 2025, Review of the pseudoscorpion genus Stenohya Beier, 1967 from China (Pseudoscorpiones, Neobisiidae), European Journal of Taxonomy 993, pp. 1-104 : 6-15

publication ID	https://doi.org/10.5852/ejt.2025.993.2909
publication LSID	lsid:zoobank.org:pub:697E434D-7C75-42BC-9943-367D46743DEB
DOI	https://doi.org/10.5281/zenodo.15555835
persistent identifier	https://treatment.plazi.org/id/ED4EC161-FF88-FFBE-FE31-F90DBA6DD6F9
treatment provided by	Plazi
scientific name	Stenohya biverticis Zhao, Guo & Zhang
status	sp. nov.

Treatment

Stenohya biverticis Zhao, Guo & Zhang sp. nov. (双峰狭伪$)

urn:lsid:zoobank.org:act:29484BAF-E833-4B3C-8B59-6BF6D2261771

Figs 1.12 View Fig , 2–8 View Fig View Fig View Fig View Fig View Fig View Fig View Fig , 69U View Fig , 70F View Fig

Diagnosis

Male pedipalpal femur with a bimodal projection in the subterminal prolateral position, a unimodal protuberance in the median prolateral position, as well as two intumescences in the ⅓ and ⅔ position on the dorsal side ( Figs 5H View Fig , 6D–E View Fig ). Apex of female pedipalpal coxa with six long setae; pedipalpal femur 4.44–4.79 times as long as broad; pedipalpal chela (with pedicel) 4.04–4.30 times as long as broad; movable finger length 2.05–2.13 mm.

Etymology

The specific epithet is derived from the Latin word ‘ biverticis ’, meaning ‘bimodal’, which refers to the male pedipalpal femur with a bimodal projection on the subterminal prolateral surface; adjective.

Type material

Holotype CHINA • ♂; Guangxi Zhuang Autonomous Region, Fuchuan Yao Autonomous County, Xiling National Park ; 24°45′03″ N, 111°14′19″ E; 267 m a.s.l.; 3 Dec. 2023; in leaf litter ( Fig. 2C View Fig ); Jiaqi Zhao, Jianzhou Sun, Tao Zheng and Songtao Shi leg.; Ps.- MHBU-GX2023120301 . GoogleMaps

Paratypes CHINA • 2 ♀♀; same collection data as for holotype; Ps.- MHBU-GX2023120302–03 GoogleMaps • 1 ♂, 4 ♀♀; same locality as for holotype; 24°44′53″ N, 111°14′38″ E; 283 m a.s.l.; 17 Jan. 2024; in leaf litter; Jiaqi Zhao, Jianzhou Sun and Yiting Xu leg.; Ps.- MHBU-GX2024011701–05 GoogleMaps .

Description

Adult male s (holotype and male paratype) ( Figs 3A View Fig , 4A View Fig )

CARAPACE ( Figs 5A View Fig , 6A View Fig , 69U View Fig ). Carapace 1.20–1.24 times as long as broad, with a total of 36–39 setae, including six near anterior margin and 5–7 near posterior margin; five lyrifissures near the eyes, three lyrifissures near posterior margin; with four corneate eyes, epistome large and triangular, with rounded apex. Carapace with slight elevations in the middle of the eye area and the posterior half of carapace in lateral view.

CHELICERA ( Figs 5B View Fig , 6B View Fig ). Hand with seven setae and two lyrifissures, movable finger with one seta; fixed finger with 10–11 teeth; movable finger with 5–6 teeth; serrula exterior with 42–45 lamellae; serrula interior with 33–36 lamellae; galea developed, divided into two main branches, one branch secondarily divided into four terminal rami, the other branch secondarily divided into three terminal rami ( Fig. 5E View Fig ); rallum consisting of eight blades, all with anteriorly directed spinules, the basalmost blade shortest ( Fig. 5C View Fig ).

PEDIPALPS ( Figs 5G–I View Fig , 6C–E View Fig ). Apex of pedipalpal coxa rounded, with six long setae. Trochanter with some small granulations, femur with some small tubercles in the prolateral position, and a bimodal projection in the subterminal prolateral position, a unimodal protuberance in the median prolateral position, as well as two intumescences in the ⅓ and ⅔ position on the dorsal side ( Figs 5I View Fig , 6D–E View Fig ); patella smooth; chelal hand concave on the dorsal side of distal half in lateral view, and with 37–42 triangular-shaped, spinous apophyses on the dorsal side, each apophysis with a seta at the base, a few spinous apophyses extended to the subbase of fixed finger. Several small granular processes located distally on the hand on retrolateral side ( Figs 5G–H View Fig , 6C–D View Fig ). Trochanter 1.42–1.48, femur 4.14–4.24, patella 3.81–4.52, chela (with pedicel) 5.13–5.30, chela (without pedicel) 4.87–5.02 times as long as broad, movable finger 1.61–1.73 times as long as hand (without pedicel). Fixed chelal finger with eight, movable chelal finger with four trichobothria: eb and esb situated basally, grouped very closely with ib and isb; est, et and it grouped distally; ist closer to et -est -it than to eb -esb -isb -ib 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 99–102 pointed teeth, movable finger with 87–88 teeth: 40–45 rounded teeth at base and 43–48 pointed teeth in distal position.

ABDOMEN. Pleural membrane granulated. Tergites and sternites undivided, tergal chaetotaxy (I–XI): 6: 7–8: 8: 10: 10–11:11: 10–11: 12: 10–12:11–13: 8–14, sternal chaetotaxy (IV–XI): 22–27:23– 24: 18–21: 18–20:17–18: 15–17: 11–15: 4, sternites VI–VIII with 6–11 medial scattered glandular setae, anal cone with two dorsal and two ventral setae. Genital area ( Figs 5F View Fig , 6F View Fig ): anterior genital sternite with 51–52 setae and two lyrifissures; posterior genital sternite with 37–44 setae and two lyrifissures.

LEGS ( Figs 5J–K View Fig , 6G–H View Fig ). In leg I, femur with marked enlargement distally, patella enlarged, tibia bent, basitarsus and telotarsus fused, the dividing line between the two segments inconspicuous ( Figs 5J View Fig , 6G View Fig ). Leg I: trochanter 1.18–1.38, femur 2.71–3.03, patella 2.30–2.75, tibia 3.70–3.83, basitarsus +telotarsus 6.06–6.27 times as long as deep. Leg IV: trochanter 2.29–2.48, femur +patella 4.32–4.53, tibia 4.13–5.64, basitarsus 3.53–4.29, telotarsus 6.67–6.83 times as long as deep; tibia with three submedial tactile setae (TS =0.22–0.29, 0.67–0.88, 0.95–1.02), basitarsus with two tactile setae (TS= 0.13–0.20, 0.8–0.87), telotarsus with two tactile setae (TS =0.56–0.60, 0.80–0.81); subterminal tarsal seta distally branched ( Fig. 5D View Fig ). Arolium not divided, shorter than the slender and simple claws.

Adult females (paratypes) ( Figs 3B View Fig , 4B View Fig )

Mostly same as in males, except where noted.

CARAPACE ( Figs 7A View Fig , 8A View Fig , 70F View Fig ). Carapace 1.00–1.02 times as long as broad, with a total of 31–36 setae, including six near anterior margin and 5–6 near posterior margin; five lyrifissures near the eyes, epistome large and triangular. Carapace smooth and nearly rectangular.

CHELICERA ( Figs 7B View Fig , 8B View Fig ). Fixed finger with 12–13 teeth; movable finger with 5–7 teeth; serrula exterior with 43–44 lamellae; serrula interior with 30–38 lamellae.

PEDIPALPS ( Figs 7G–I View Fig , 8D–E View Fig ). Apex of pedipalpal coxa with six long setae. Femur with a few tubercles prolaterally ( Figs 7I View Fig , 8D View Fig ). Trochanter 1.55–1.81, femur 4.44–4.79, patella 3.18–3.40, chela (with pedicel) 4.04–4.30, chela (without pedicel) 3.87–4.10 times as long as broad, movable finger 1.66–1.77 times as long as hand (without pedicel). Fixed chelal finger with 89–103 pointed teeth, movable finger with 89–93 teeth: 39–44 rounded teeth at base and 45–54 pointed ones in distal position.

ABDOMEN. Tergal chaetotaxy (I–XI): 5–6: 7–8: 8: 10: 10: 10:10: 9–10: 12: 10–12: 12–13, sternal chaetotaxy (IV–XI): 25–28: 21–23: 20–21: 17:16–18: 16–17: 14–15: 2–5, sternites VI–VIII with two medial glandular setae; genital area ( Figs 7F View Fig , 8C View Fig ): sternite II with a total of 15–23 setae and two lyrifissures; sternite III with a row of 29–31 setae and two lyrifissures.

LEGS ( Figs 7J–K View Fig , 8F–G View Fig ). Leg I: trochanter 1.21–1.41, femur 3.44–4.38, patella 2.91–3.00, tibia 4.25– 5.14, basitarsus 3.08–3.73, telotarsus 4.18–4.67 times as long as deep. Leg IV: trochanter 2.45–2.79, femur +patella 4.05–4.18, tibia 5.91–6.71, basitarsus 3.13–3.93, telotarsus 6.36–6.62 times as long as deep; tibia with two submedial tactile setae (TS=0.66–0.71, 0.97–1.02), basitarsus with two tactile setae (TS =0.17–0.20, 0.83–0.98), telotarsus with two tactile setae (TS=0.24–0.34, 0.58–0.59).

Measurements (in mm; length/breadth or, for legs, length/depth)

Males (holotype and paratypes)

Body length 4.02–4.17. Carapace 1.51–1.52/1.22–1.27. Pedipalpal trochanter 0.68–0.71/0.48, femur 1.74–1.82/0.41–0.44, patella 1.37–1.49/0.33–0.36, chela (with pedicel) 3.08–3.23/0.60–0.61, chela (without pedicel) 2.92–3.06/0.60–0.61, hand (without pedicel) length 1.11–1.18, movable finger length 1.90–1.92. Leg I: trochanter 0.45–0.51/0.37–0.38, femur 0.95–1.00/0.33–0.35, patella 0.69–0.77/0.28– 0.30, tibia 0.69–0.74/0.18–0.20, basitarsus+telotarsus 0.94–0.97/0.15–0.16. Leg IV: trochanter 0.64– 0.72/0.28–0.29, femur +patella 1.54–1.64/0.34–0.38, tibia 1.28–1.31/0.21–0.22, basitarsus 0.53– 0.60/0.14–0.15, telotarsus 0.80–0.82/0.12.

Females (paratypes)

Body length 4.64–5.18. Carapace 1.33–1.35/1.32–1.33. Pedipalpal trochanter 0.68–0.78/0.43–0.44, femur 1.78–1.87/0.39–0.41, patella 1.43–1.53/0.43–0.47, chela (with pedicel) 3.19–3.44/0.79–0.81, chela (without pedicel) 3.06–3.26/0.79–0.81, hand (without pedicel) length 1.16–1.28, movable finger length 2.05–2.13. Leg I: trochanter 0.40–0.42/0.29–0.33, femur 0.86–0.95/0.21–0.25, patella 0.63–0.67/0.21–0.23, tibia 0.68–0.72/0.14–0.16, basitarsus 0.40–0.41/0.11–0.13, telotarsus 0.46– 0.56/0.11–0.12. Leg IV: trochanter 0.76–0.78/0.28–0.31, femur +patella 1.61–1.67/0.39–0.41, tibia 1.30–1.41/0.21–0.22, basitarsus 0.50–0.59/0.15–0.16, telotarsus 0.84–0.89/0.13–0.14.

Distribution

China: Guangxi Zhuang Autonomous Region.

Remarks

The enlarged leg I observed in the male of this new species also occurs in the males of S. gibba Zhao, Guo & Zhang, 2024 , S. papillata Zhao, Guo & Zhang, 2024 and S. guangmingensis Zhao, Guo & Zhang, 2024 . This new species can be distinguished by the differences in the pedipalpal femur: in S. biverticis Zhao, Guo & Zhang sp. nov., the pedipalpal femur has two intumescences in the ⅓ and ⅔ position on the dorsal side (smooth femur in S. gibba , S. papillata and S. guangmingensis ) ( Zhao et al. 2024). Females of this new species are similar to those of S. bicornuta , S. gibba , S. hamata , S. gruberi ( Ćurčić, 1983) , S. papillata and S. guangmingensis , but can be distinguished as follows: the presence of six long setae on the apex of the pedipalpal coxa (eight in S. bicornuta and S. papillata ); pedipalpal femur 4.44–4.79 times as long as broad (5.37 in S. bicornuta ; 4.90–5.39 in S. guangmingensis ); pedipalpal chela (with pedicel) 4.04–4.30 times as long as wide (4.67–4.98 in S. gibba ); and movable finger length 2.05–2.13 (1.53–1.67 in S. hamata ; 1.89 in S. gruberi ) ( Ćurčić 1983; Leclerc & Mahnert 1988; Guo et al. 2019; Zhao et al. 2024).