Stenohya ungulata 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 : 88-95

Stenohya ungulata Zhao, Guo & Zhang sp. nov. (Ŕ印狭伪$)

urn:lsid:zoobank.org:act:9347F564-D764-4FDD-A138-F8D507A65498

Figs 1.23 , 64–68 , 69R , 70G

Diagnosis

Male pedipalpal femur with a curved protuberance at a distance of ⅔ from the base in the prolateral position, a projection on the subdistal prolateral surface, and an intumescence in the median dorsal position, surrounded by several tubercles ( Figs 65I , 66C–D ); patella with a small, triangular projection in prolateral position ( Figs 65I , 66D ). In male leg I, femur with a mountain-like prominence in distal position, the basal half of basitarsus and telotarsus with a large irregular projection and a small finger-shaped projection, the large irregular projection concave in the middle, horseshoe-shaped in dorsal view, the tip of the finger-shaped projection semi-transparent ( Figs 65J , 66G–J ). Female pedipalpal femur 4.68–5.06 times as long as broad; presence of 89–93 pointed teeth on pedipalpal fixed chelal finger; the presence of 34–39 rounded teeth at base and 42–47 pointed teeth in distal position on pedipalpal movable chelal finger; pedipalpal chelal movable finger 1.52–1.53 times as long as hand (without pedicel).

Etymology

The specific epithet is derived from the Latin word ‘ ungulata ’, meaning ‘hoofprint’, which refers to the horseshoe-shaped protrusion in the dorsal position of basitarsus +telotarsus in male leg I; noun in apposition.

Type material

Holotype CHINA • ♂; Guangxi Zhuang Autonomous Region, Qixing District, Xinan Village; 25°15′54″ N, 110°20′44″ E; 149 m a.s.l.; 1 Feb. 2024; Haofei Fan leg.; Ps.- MHBU-GX2024020101 .

Paratypes CHINA • 3 ♂♂, 5 ♀♀; same collection data as for holotype; Ps.- MHBU-GX2024020102–09 .

Description

Adult males (holotype and male paratypes) ( Fig. 64A )

CARAPACE ( Figs 65A , 66A , 69R ). Carapace 1.10–1.27 times as long as broad, with a total of 28–32 setae, including 6–7 near anterior margin and six near posterior margin; five lyrifissures near the eyes, four lyrifissures near posterior margin; epistome small, triangular, with rounded top; with four corneate eyes. Carapace with slight elevations in the middle of the eye area and near middle of carapace in lateral view.

CHELICERA ( Figs 65B , 66B ). Hand with six setae and two lyrifissures, movable finger with one seta; fixed finger with 11–12 teeth; movable finger with 5–7 teeth; serrula exterior with 34–39 lamellae; serrula interior with 25–33 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. 65E ); rallum consisting of seven blades, all with anteriorly directed spinules, the basalmost blade shortest ( Fig. 65C ).

PEDIPALPS ( Figs 65G–I , 66C–E ). Apex of pedipalpal coxa rounded, with five long setae. Trochanter with some small granulations, femur with a curved protuberance at a distance of ⅔ from the base in the prolateral position, a projection on the subdistal prolateral surface.An intumescence in the median dorsal position, surrounded by several tubercles ( Figs 65I , 66C–D ); patella with a small, triangular projection in the prolateral position ( Figs 65I , 66D ); chelal hand concave on the ventral side of distal half, and with 29–31 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 ( Figs 65G–H , 66D–E ). Trochanter 2.11– 2.13, femur 4.24–4.46, patella 4.23, chela (with pedicel) 4.93–5.64, chela (without pedicel) 4.81–5.40 times as long as broad, movable finger 1.86–1.89 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 96–97 pointed teeth, movable finger with 84–88 teeth: 39–44 rounded teeth at base and 44–45 pointed teeth in distal position.

ABDOMEN. Pleural membrane granulated. Tergites and sternites undivided, tergal chaetotaxy (I–XI): 4–5: 6–9:9–10: 10:9–11:11–12:11–12: 11–13:11–13:11–12:9, sternal chaetotaxy (IV–XI):20– 26:22: 20–21:20–22: 18–19:15–18: 12–14:4–5, sternites VI–VIII with 7–10 medial scattered glandular setae, anal cone with two dorsal and two ventral setae. Genital area ( Figs 65F , 66F ): anterior genital sternite with 35–44 setae and one lyrifissure; posterior genital sternite with 38–42 setae and three lyrifissures.

LEGS ( Figs 65J–K , 66G–J ). In leg I, femur with a mountain-like prominence distally; patella with an enlargement in the middle and with a small cylindrical protuberance terminally; tibia claviform; basitarsus and telotarsus fused, the dividing line between the two segments disappears, the basal half of basitarsus and telotarsus with a large irregular projection and a smaller finger-shaped projection, the large irregular projection concave in the middle, horseshoe-shaped in dorsal view, the tip of the finger-shaped projection semi-transparent ( Figs 65J , 66I–J ). Leg I: trochanter 1.00–1.07, femur 2.27–2.56, patella 3.15, tibia 3.95–4.25, basitarsus+telotarsus 3.68–3.70 times as long as deep. Leg IV: trochanter 2.67–2.71, femur+ patella 4.71, tibia 7.29–7.39, basitarsus 4.15, telotarsus 8.89–9.33 times as long as deep; tibia with two submedial tactile setae (TS=0.50–0.61, 0.95–0.99), basitarsus with two tactile setae (TS =0.13–0.15, 0.81–0.85), telotarsus with two tactile setae (TS =0.20–0.24, 0.63–0.66); subterminal tarsal seta distally branched ( Fig. 65D ). Arolium not divided, shorter than the slender and simple claws.

Adult female (paratype females) ( Fig. 64B )

Mostly same as in males, except where noted.

CARAPACE ( Figs 67A , 68A , 70G ). Carapace 1.06–1.10 times as long as broad, with a total of 30–31 setae, including six near anterior margin and 7–8 near posterior margin; five lyrifissures near the eyes, four lyrifissures near posterior margin. Carapace nearly smooth and rectangular.

CHELICERA ( Figs 67B , 68B ). Fixed finger with 13–14 teeth; movable finger with 6–7 teeth; serrula exterior with 37–39 lamellae; serrula interior with 30–37 lamellae; rallum consisting of eight blades, all with anteriorly directed spinules, the basalmost blade shortest ( Fig. 67C ).

PEDIPALPS ( Figs 67G–I , 68D–E ). Apex of pedipalpal coxa with five long setae. Femur with a few tubercles prolaterally ( Figs 67I , 68E ). Trochanter 1.90–2.33, femur 4.68–5.06, patella 3.38–3.58, chela (with pedicel) 4.11–4.46, chela (without pedicel) 3.91–4.15 times as long as broad, movable finger 1.52–1.53 times as long as hand (without pedicel). Fixed chelal finger with 89–93 pointed teeth, movable finger with 76–86 teeth: 34–39 rounded teeth at base and 42–47 pointed in distal position.

ABDOMEN. Tergal chaetotaxy (I–XI): 2–4: 7–8: 8:9–10:10: 10: 10–11: 11: 10:10: 8–10, sternal chaetotaxy (IV–XI): 22–24: 21:18–19: 18–19: 17–18: 15–16: 11–12:4–5, sternites VI–VIII with two medial glandular setae; genital area ( Figs 67F , 68C ): sternite II with a total of 19–20 setae and two lyrifissures; sternite III with a row of 29–30 setae and two lyrifissures.

LEGS ( Figs 67J–K , 68F–G ). Leg I: trochanter 1.23–1.41, femur 4.55–4.80, patella 3.10–3.89, tibia 4.29– 4.67, basitarsus 2.69–3.17, telotarsus 4.55–5.00 times as long as deep. Leg IV: trochanter 2.37–2.72, femur +patella 4.14–4.47, tibia 7.00–7.05, basitarsus 4.07–4.42, telotarsus 5.13–7.67 times as long as deep; tibia with two submedial tactile setae (TS=0.18–0.21, 0.62–0.65), basitarsus with two tactile setae (TS =0.12–0.17, 0.83–0.84), telotarsus with two tactile setae (TS=0.35–0.43, 0.59–0.60).

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

Males (holotype and paratypes)

Body length 3.68–3.88. Carapace 1.18–1.26/0.99–1.07. Pedipalpal trochanter 0.76–0.81/0.36–0.38, femur 1.61–1.65/0.37–0.38, patella 1.27–1.31/0.30–0.31, chela (with pedicel) 2.91–3.10/0.55–0.59, chela (without pedicel) 2.84–2.97/0.55–0.59, hand (without pedicel) length 0.99–1.04, movable finger length 1.87–1.93. Leg I: trochanter 0.30–0.33/0.28–0.33, femur 1.02–1.05/0.41–0.45, patella 0.82/0.26, tibia 0.79–0.85/0.20, basitarsus+ telotarsus 0.74–0.81/0.20–0.22. Leg IV: trochanter 0.57–0.64/0.21–0.24, femur +patella 1.46/0.31, tibia 1.24–1.33/0.17–0.18, basitarsus 0.54/0.13, telotarsus 0.80–0.84/0.09.

Females (paratypes)

Body length 5.39–5.83. Carapace 1.33–1.34/1.21–1.26. Pedipalpal trochanter 0.74–0.91/0.39, femur 1.78–1.82/0.36–0.38, patella 1.35–1.43/0.40, chela (with pedicel) 3.08–3.17/0.71–0.75, chela (without pedicel) 2.93–2.95/0.71–0.75, hand (without pedicel) length 1.20–1.24, movable finger length 1.83– 1.89. Leg I: trochanter 0.37–0.38/0.27–0.30, femur 0.96–1.00/0.20–0.22, patella 0.62–0.70/0.18 –0.20, tibia 0.70–0.73/0.15–0.17, basitarsus 0.35–0.38/0.12–0.13, telotarsus 0.50/0.10–0.11. Leg IV: trochanter 0.64–0.79/0.27–0.29, femur +patella 1.49–1.70/0.36–0.38, tibia 1.34–1.47/0.19–0.21, basitarsus 0.53– 0.57/0.12–0.14, telotarsus 0.82–0.92/0.12–0.16.

Distribution

China: Guangxi Zhuang Autonomous Region.

Remarks

This new species is similar to S. gibba in the presence of projections on the lateral side of the basitarsus and telotarsus in the male leg I, but it can be distinguished by having a large irregular projection and a smaller finger-shaped projection on the basitarsus and telotarsus (in S. gibba , basitarsus and telotarsus each have a large columnar projection on the lateral side) ( Zhao et al. 2024). Females of this new species are similar to those of S.cordata , S. gibba , S. guangmingensis , S. jiahensis , S. margarita , S. papillata and S. polygonia , but can be distinguished by the pedipalpal femur 4.68–5.06 times as long as broad (3.83–3.93 in S.cordata ); the pedipalpal fixed chelal finger with 89–93 pointed teeth (81–82 pointed teeth in S. jiahensis ); the pedipalpal movable chelal finger with 34–39 rounded teeth at the base and 42– 47 pointed teeth in distal position ( S. guangmingensis with 47–48 rounded teeth at the base, and 45–46 pointed ones, S. margarita with 46–49 rounded teeth at the base, and 33–34 pointed ones, S. papillata with 43–49 rounded teeth at the base, and 45–47 pointed ones, and S. polygonia with 47–54 rounded teeth at the base, and 42–48 pointed ones); the pedipalpal chelal movable finger 1.52–1.53 times as long as the hand (without pedicel) (1.60–1.72 in S. gibba , 1.62–1.66 in S. guangmingensis , 1.69–1.82 in S. margarita ) ( Zhao et al. 2024).

Figures

Fig. 1. Distribution map of species of Stenohya Beier, 1967 from China. 1. Stenohya xiningensis Zhao, Zhang & Jia, 2011. 2. Stenohya setulosa Guo & Zhang, 2016. 3. Stenohya bomica Zhao & Zhang, 2011. 4. Stenohya spinata Zhan, Feng & Zhang, 2023. 5. Stenohya qianlei Zhao, Guo & Zhang sp. nov. 6. Stenohya gibba Zhao, Guo & Zhang, 2024. 7. Stenohya papillata Zhao, Guo & Zhang, 2024. 8. Stenohya margarita Zhao, Guo & Zhang sp. nov. 9. Stenohya guangmingensis Zhao, Guo & Zhang, 2024. 10. Stenohya jiaxiani Zhao, Guo & Zhang sp. nov. 11. Stenohya huangi Hu & Zhang, 2012. 12. Stenohya biverticis Zhao, Guo & Zhang sp. nov. 13. Stenohya pengae Hu & Zhang, 2012. 14. Stenohya hainanensis Guo & Zhang, 2016. 15. Stenohya curvata Zhao, Zhang & Jia, 2011. 16. Stenohya bicornuta Guo, Zang & Zhang, 2019. 17. Stenohya harveyi Zhao, Guo & Zhang sp. nov. 18. Stenohya arcuata Guo, Zang & Zhang, 2019. 19. Stenohya tengchongensis Yang & Zhang, 2013. 20. Stenohya meiacantha Yang & Zhang, 2013. 21. Stenohya jiahensis Li & Shi, 2023. 22. Stenohya cordata Zhao, Guo & Zhang sp. nov. 23. Stenohya ungulata Zhao, Guo & Zhang sp. nov. 24. Stenohya polygonia Zhao, Guo & Zhang sp. nov. 25. Stenohya dongtianensis Li & Shi, 2023.

Fig. 64. Stenohya ungulata Zhao, Guo & Zhang sp. nov. A. Holotype, male (dorsal view) (Ps.-MHBU- GX2024020101). B. Paratype, female (dorsal view) (Ps.-MHBU-GX2024020102). Scale bars: 2 mm.

Fig. 65. Stenohya ungulata Zhao, Guo & Zhang sp. nov., holotype, male (Ps.-MHBU-GX2024020101). A. Carapace, dorsal view. B. Left chelicera, dorsal view. C. Rallum. D. Subterminal tarsal seta. E. Galea. F. Chaetotaxy of genital area, ventral view. G. Right pedipalpal chela, lateral view, showing trichobothriotaxy and teeth. H. Right pedipalpal chela, dorsal view. I. Right pedipalp (trochanter, femur and patella), dorsal view. J. Right leg I, lateral view. K. Right leg IV, lateral view. Scale bars: A, F =0.5 mm; B =0.2 mm; C–E =0.1 mm; G–K =1 mm.

Fig. 66. Stenohya ungulata Zhao, Guo & Zhang sp. nov., holotype, male (Ps.-MHBU-GX2024020101). A. Carapace, dorsal view. B. Left chelicera, dorsal view. C. Right pedipalpal femur, retrolateral view (red box showing an intumescence on the median dorsal position). D. Right pedipalp, dorsal view (red box showing an intumescence on the median dorsal position). E. Right pedipalpal chela, lateral view. F. Genital area, ventral view. G. Right leg I, lateral view. H. Right leg IV, lateral view. I. Right leg I (basitarsus and telotarsus), retrolateral view. J. Right leg I (basitarsus and telotarsus), dorsal view. Scale bars: A, F, I–J =0.5 mm; B=0.2 mm; C–E, G–H=1 mm.

Fig. 67. Stenohya ungulataZhao, Guo & Zhang sp. nov., paratype, female (Ps.-MHBU-GX2024020102). A. Carapace, dorsal view. B. Right chelicera, dorsal view. C. Rallum. D. Subterminal tarsal seta. E. Galea. F. Chaetotaxy of genital area, ventral view. G. Right pedipalpal chela, lateral view, showing trichobothriotaxy and teeth. H. Right pedipalpal chela, dorsal view. I. Right pedipalp (trochanter, femur and patella), dorsal view. J. Right leg I, lateral view. K. Right leg IV, lateral view. Scale bars: A, F =0.5 mm; B =0.2 mm; C–E =0.1 mm; G–K =1 mm.

Fig. 68. Stenohya ungulata Zhao, Guo & Zhang sp. nov., paratype, female (Ps.-MHBU-GX2024020102). A. Carapace, dorsal view. B. Right chelicera, dorsal view. C. Genital area, ventral view. D. Right pedipalpal chela, lateral view. E. Right pedipalp, dorsal view. F. Right leg I, lateral view. G. Right leg IV, lateral view. Scale bars: A, C=0.5 mm; B =0.2 mm; D–G =1 mm.

Fig. 69. Male carapaces, lateral views (the red arrows indicate the elevation on the carapace). A. Stenohya curvata Zhao, Zhang & Jia, 2011. B. Stenohya huangi Hu & Zhang, 2012. C. Stenohya bicornuta Guo, Zang & Zhang, 2019. D. Stenohya meiacantha Yang & Zhang, 2013. E. Stenohya harveyi Zhao, Guo & Zhang sp. nov. F. Stenohya margarita Zhao, Guo & Zhang sp. nov. G. Stenohya xiningensis Zhao, Zhang & Jia, 2011. H. Stenohya pengae Hu & Zhang, 2012. I. Stenohya setulosa Guo & Zhang, 2016. J. Stenohya tengchongensis Yang & Zhang, 2013. K. Stenohya polygonia Zhao, Guo & Zhang sp. nov. L. Stenohya jiahensis Li & Shi, 2023. M. Stenohya jiaxiani Zhao, Guo & Zhang sp. nov. N. Stenohya spinata Zhan, Feng & Zhang, 2023. O. Stenohya dongtianensis Li & Shi, 2023.P. Stenohya qianleiZhao, Guo & Zhang sp. nov. Q. Stenohya papillata Zhao, Guo & Zhang, 2024. R. Stenohya ungulata Zhao, Guo & Zhang sp. nov. S. Stenohya cordata Zhao, Guo & Zhang sp. nov. T. Stenohya guangmingensis Zhao, Guo & Zhang, 2024. U. Stenohya biverticis Zhao, Guo & Zhang sp. nov. V. Stenohya gibba Zhao, Guo & Zhang, 2024. W. Stenohya hainanensis Guo & Zhang, 2016. X. Stenohya arcuata Guo, Zang & Zhang, 2019. Scale bars: 1 mm.

Fig. 70. Female carapaces, lateral views (the red arrows indicate the elevation on the carapace). A. Stenohya hainanensis Guo & Zhang, 2016. B. Stenohya harveyi Zhao, Guo & Zhang sp. nov. C. Stenohya huangi Hu & Zhang, 2012. D. Stenohya jiahensis Li & Shi, 2023. E. Stenohya pengae Hu & Zhang, 2012. F. Stenohya biverticis Zhao, Guo & Zhang sp. nov. G. Stenohya ungulata Zhao, Guo & Zhang sp. nov. H. Stenohya curvata Zhao, Zhang & Jia, 2011. I. Stenohya meiacantha Yang & Zhang, 2013. J. Stenohya qianlei Zhao, Guo & Zhang sp. nov. K. Stenohya tengchongensis Yang & Zhang, 2013. L. Stenohya bicornuta Guo, Zang & Zhang, 2019. M. Stenohya jiaxiani Zhao, Guo & Zhang sp. nov. N. Stenohya polygonia Zhao, Guo & Zhang sp. nov. O. Stenohya dongtianensis Li & Shi, 2023.P. Stenohya cordata Zhao, Guo & Zhang sp. nov. Q. Stenohya margarita Zhao, Guo & Zhang sp. nov. R. Stenohya guangmingensis Zhao, Guo & Zhang, 2024. S. Stenohya spinata Zhan, Feng & Zhang, 2023. T. Stenohya gibba Zhao, Guo & Zhang, 2024. U. Stenohya arcuata Guo, Zang & Zhang, 2019. V. Stenohya papillata Zhao, Guo & Zhang, 2024. Scale bars: 1 mm.