Bisetocreagris gaoi, Guo, Wang & Fe. Zhang, 2018

Guo, Xiangbo, Wang, Weitong & Zhang, Feng, 2018, Description Of Three New Bisetocreagris Species (Pseudoscorpiones: Neobisiidae) From Southern China, Acta Zoologica Academiae Scientiarum Hungaricae 64 (3), pp. 227-242 : 237-241

Bisetocreagris gaoi sp. n.

( Figs 7–9)

Type material. Holotype male (Ps.- MHBU-GZ14101301 ), China: Guizhou Province, Jiangkou County, Fanjing Mountain (27°55’N, 108°40’E), alt. 2024 m, 13 October 2014, Zhizhong Gao leg. Paratypes: three males and five females (Ps.- MHBU- GZ14101302–09), same data as for holotype .

Etymology. The specific name is a patronym in honor of Dr. Zhizhong Gao, who col- lected the specimens.

Diagnosis. Carapace with a total of 27 setae, including 6 on the anterior margin and 6 on the posterior margin; 4 eyes, with vaulted lens. Pedipalpal femur with granulations on medial face, patella and chelal hand smooth. Male pedipalpal femur 4.05–4.17 (female 3.87–4.17), patella 2.96–3.00 (female 2.63–2.66), chela (without pedicel) 4.00–4.08 (female 3.33–3.38) times longer than broad; movable finger longer than hand (without pedicel). Male fixed chelal finger with 62–65 (female 65–67) teeth, movable finger with 66–70 (female 66–67) small teeth.

Description. Male ( Fig. 7a) – Pedipalps and chelicerae yellowish brown, carapace and abdomen darker, legs pale brown.

Carapace ( Figs 8d, 9a). Smooth, 1.15 times longer than broad, with a total of 27 setae, including 6 on the anterior margin and 6 on the posterior margin; epistome small, triangular; 4 eyes, with vaulted lens.

Chelicera ( Figs 8a, 9b). Hand with 7 setae, movable finger with 1 seta; fixed finger with 10 teeth; movable finger with 6 teeth; serrula exterior with 26–29 lamellae; serrula interior with 22–25 lamellae. Galea with 4 small terminal branches, structure as shown in Fig. 8e. Rallum ( Fig. 8g) with 8 blades, all with anteriorly-directed spinules, the basalmost blade shortest.

Pedipalps ( Figs 8b, 8c, 9c, 9d). Apex of pedipalpal coxa rounded, with 4–5 setae. Pedipalpal femur with granulations on medial face, patella and chelal hand smooth. Trochanter 1.60–1.67, femur 4.05–4.17, patella 2.96–3.00, chela (with pedicel) 4.28–4.38, chela (without pedicel) 4.00–4.08 times longer than broad, movable finger 1.46–1.56 times longer than hand (without pedicel). Fixed chelal finger with 8 and movable finger with 4 trichobothria: eb and esb on lateral margin of hand; ib, isb and ist in basal half, est in the middle, et and it in distal half of fixed finger; t and st near the middle of movable finger, sb and b in basal half. Venom apparatus present only in fixed chelal finger, venom duct very short. Fixed chelal finger with 62–65 and movable finger with 66–70 contiguous teeth, mostly rounded, cusped only in distal end.

Abdomen. Pleural membrane granulated. Tergites and sternites with uniseriate setation, tergal chaetotaxy (I–XI): 10: 11: 11: 12: 12: 12: 12: 12–13: 12–13: 12: 5, sternal chaetotaxy (IV–XI): 11: 16: 15: 15–16: 16: 16: 13: 6; stigmata with 4–5 small setae on anterior margin, anal cone with 2 dorsal and 2 ventral setae. Male genital area ( Figs 8h, 9g): sternite II with a median and posterior group of 28–30 setae; sternite III with an anteromedian bisetous groove, followed by 16 median and posterior setae.

Legs. Leg I ( Fig. 9e) and leg IV ( Figs 8j, 9f) typical. Tibia IV with one sub-medial tactile seta (TS = 0.43–0.44), basitarsus IV with one tactile seta in basal half (TS = 0.15), telotarsus IV with one sub-medial tactile seta (TS = 0.43–0.44). Subterminal tarsal seta bifurcate; arolium not divided, shorter than the slender and simple claws.

Female ( Fig. 7b) – As in holotype except where noted.

Chelicera. Fixed finger with 7 teeth; movable finger with 6 teeth; serrula exterior with 28–30 lamellae; serrula interior with 23–26 lamellae. Galea with 5 terminal branches, structure as shown in fig. 8f.

Pedipalps. Trochanter 1.61–1.68, femur 3.87–4.17, patella 2.63–2.66, chela (with pedicel) 3.57–3.64, chela (without pedicel) 3.33–3.38 times longer than broad, movable finger 1.25–1.27 times longer than hand (without pedicel). Fixed chelal finger with 65–67 and movable finger with 66–67 contiguous teeth, mostly rounded, cusped only in distal end.

Abdomen. Tergal chaetotaxy (I–XI): 10: 11: 11–12: 12: 12: 12: 12–13: 12: 13: 13: 5, sternal chaetotaxy (IV–XI): 11: 15: 16: 15–16: 15–16: 15: 14: 6. Female genital area ( Figs 8i, 9h): sternite II with 4–5 setae on each side; sternite III with a row of 10 setae on the posterior margin.

Measurements (length/breadth or depth in mm). Male. Body length 2.51–2.77. Carapace 0.78×0.68 (1.15). Chelicera 0.49–0.53×0.26 (1.88–2.04), movable finger length 0.31–0.33. Pedipalpal trochanter 0.48–0.50×0.30 (1.60–1.67), femur 0.89–0.96×0.22–0.23 (4.05–4.17), patella 0.77–0.78×0.26 (2.96–3.00), chela (with pedicel) 1.54–1.62×0.36–0.37 (4.28–4.38), chela (without pedicel) 1.44–1.51×0.36– 0.37 (4.00–4.08), hand length (without pedicel) 0.59, movable finger length 0.86–0.92 (1.46–1.56×hand). Leg I: trochanter 0.20–0.21×0.16 (1.25–1.31), femur 0.45–0.47×0.15–0.16 (2.94–3.00), patella 0.30×0.13 (2.31), tibia 0.36–0.40×0.10 (3.60– mm (b, c)

4.00), basitarsus 0.19–0.22×0.07 (2.71–3.14), telotarsus 0.31×0.07 (4.43). Leg IV: trochanter 0.26×0.19 (1.37), femur + patella 0.84–0.86×0.28–0.29 (2.97–3.00), tibia 0.65–0.68×0.14 (4.64– 4.86), basitarsus 0.26–0.28×0.11 (2.36–2.55), telotarsus 0.37–0.41×0.10 (3.70–4.10).

pace, dorsal view; b = right chelicera, dorsal view; c = right pedipalp, dorsal view; d = right chela, lateral view; e = leg I, lateral view; f = leg IV, lateral view; g = genital area of male;

h = genital area of female

Female. Body length 2.86–3.04. Carapace 0.85–0.88×0.72–0.77 (1.14–1.18). Chelicera: 0.52–0.57×0.26–0.28 (2.00–2.04), movable finger length 0.34–0.36. Pedipalpal trochanter 0.47–0.50×0.28–0.31 (1.61–1.68), femur 0.89–0.96×0.23 (3.87–4.17), patella 0.71–0.77×0.27– 0.29 (2.63–2.66), chela (with pedicel) 1.53–1.64×0.42–0.46 (3.57–3.64), chela (without pedicel) 1.42–1.53×0.42–0.46 (3.33–3.38), hand length (without pedicel) 0.64–0.69, movable finger length 0.81–0.86 (1.25–1.27×hand). Leg I: trochanter 0.22–0.25×0.17 (1.29–1.47), femur 0.48–0.54×0.16–0.19 (2.84–3.00), patella 0.32×0.13 (2.46), tibia 0.39–0.41×0.11 (3.55–3.73), basitarsus 0.21×0.08 (2.63), telotarsus 0.33–0.34×0.07 (4.71–4.86). Leg IV: trochanter 0.27×0.19 (1.42), femur + patella 0.90–0.95×0.31–0.32 (2.90–2.97), tibia 0.72–0.76×0.15–0.16 (4.75–4.80), basitarsus 0.25–0.28×0.10–0.11 (2.50–2.55), telotarsus 0.43–0.45×0.10 (4.30–4.50).

Distribution. China (Guizhou).

Remarks. The other Bisetocreagris species with comparable pedipalpal size (pedipalpal femur 0.89–0.96, patella 0.71–0.78 mm in length) are B. tenuis (Redikorzev, 1934) , B. annamensis (Beier, 1951) , B. kwantungensis (Beier, 1967) , B. latona ( Ćurčić, 1985) and B. nuratiensis Dashdamirov et Schawaller, 1992 . Bisetocreagris gaoi can be distinguished from these species by: carapace with 27 setae (22 in B. latona ); pedipalpal femur with granulations on medial face (femur smooth in B. tenuis , B. annamensis and B. kwantungensis ); chelal hand smooth (chelal hand with granulations in B. annamensis , B. latona and B. nuratiensis ); pedipalpal femur 3.87–4.17 (3.00– 3.10 in B. annamensis ) times longer than broad; chelal finger longer than hand (chelal finger equal in length to hand in B. tenuis ; chelal finger shorter than hand in B. annamensis and B. nuratiensis ).