Bisetocreagris shunhuangensis, 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 : 228-232

Bisetocreagris shunhuangensis sp. n.

( Figs 1–3)

Type material. Holotype male (Ps.- MHBU-HUN15100801 ), China: Hunan Province, Dong’an County, Damiaokou Town, Shunhuang Mountain (26°26’N, 111°03’E), alt. 883 m, 8 October 2015, Xiangbo Guo leg. Paratypes: one male and one female (Ps.-MHBU- HUN15100802–03), same data as for holotype ; one female (Ps.- MHBU-HUN15100901 ), same locality as for holotype, 9 October 2015, Xiangbo Guo leg.

Etymology. The specific name is an adjective that refers to the type locality.

Diagnosis. Carapace with a total of 27–28 setae, including 4 on the anterior margin and 7–8 on the posterior margin; 4 eyes, all with vaulted lens. Pedipalpal femur and patella smooth, chelal hand with fine granulations on medial face. Male pedipalpal femur 2.75–2.81 (female 2.67), patella 2.13–2.26 (female 2.04), chela (without pedicel) 2.90–2.97 (female 2.65–2.79) times longer than broad; movable finger longer than hand (without pedicel). Male fixed chelal finger with 36–37 (female 38) teeth, movable finger with 43 (female 45) small teeth.

Description. Male ( Fig. 1a) – Pedipalps brown, carapace, abdomen and legs pale gray.

Carapace ( Figs 2a, 3a). Smooth, 1.19 times longer than broad, with a total of 28 setae, including 4 on the anterior margin and 7–8 on the posterior margin; epistome small, triangular; 4 eyes, with vaulted lens.

Chelicera ( Figs 2b, 3b). Hand with 7 setae, movable finger with 1 seta; fixed finger with 10 teeth; movable finger with 8 teeth; serrula exterior with 28 lamellae; serrula interior with 21–23 lamellae. Galea with 8 terminal branches, structure as shown in fig. 2c. Rallum ( Fig. 2e) consists of 8 blades, distalmost blade with spinules both anteriorly and posteriorly, while other blades with anteriorly-directed spinules; the basalmost blade shortest.

Pedipalps ( Figs 2f, 2g, 3c, 3d). Apex of pedipalpal coxa rounded, with 3–4 setae. Femur and patella smooth, chelal hand with fine granulations on medial face. Trochanter 1.55, femur 2.75–2.81, patella 2.13–2.26, chela (with pedicel) 3.13–3.21, chela (without pedicel) 2.90–2.97 times longer than broad, movable finger 1.29–1.39 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 36–37 contiguous teeth, rounded in basal two thirds and cusped in distal third; movable finger with 43 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: 11: 11: 11: 11: 11: 11–12: 11: 7, sternal chaetotaxy (IV–XI): 9: 14: 15: 14: 14: 13: 12: 5; stigmata with 5–6 small setae on anterior margin, anal cone with 2 dorsal and 2 ventral setae. Male genital area ( Figs 2h, 3g): sternite II with a median and posterior group of 18 setae; sternite III with an anteromedian bisetous groove, followed by 14 median and posterior setae.

Legs. Leg I ( Fig. 3e) and leg IV ( Figs 2j, 3f) typical. Tibia IV with one medial tactile seta (TS = 0.49), basitarsus IV with a basal tactile seta (TS = 0.20), telotarsus IV with one sub-medial tactile seta (TS = 0.37). Subterminal tarsal seta bifurcate; arolium not divided, shorter than the slender and simple claws.

Female ( Fig. 1b) – As in holotype except where noted.

Chelicera. Fixed finger with 9 teeth; movable finger with 8 teeth; serrula exterior with 27 lamellae; serrula interior with 23 lamellae. Galea with 8 terminal branches, structure as shown in Fig. 2d.

area of female; j = tip of telotarsus IV, lateral view. Scale bars: 0.05 mm (e); 0.10 mm (b, h–j);

0.20 mm (a, f, g)

Pedipalps. Trochanter 1.75–1.85, femur 2.67, patella 2.04, chela (with pedicel) 2.85– 3.03, chela (without pedicel) 2.65–2.79 times longer than broad, movable finger 1.20–1.21 times longer than hand (without pedicel). Fixed chelal finger with 38 contiguous teeth, rounded in basal two thirds and cusped in distal third; movable finger with 45 contiguous teeth, mostly rounded, cusped only in distal end.

h): a = carapace, dorsal view; b = right chelicera, dorsal view; c = right chela, lateral view;

d = right pedipalp, dorsal view; e = leg I, lateral view; f = leg IV, lateral view; g = genital area of male; h = genital area of female

Abdomen. Tergal chaetotaxy (I–XI): 10: 11: 11: 11–12: 11: 11–12: 11: 11: 12: 12: 7, sternal chaetotaxy (IV–XI): 10: 14–16: 15: 16: 16: 15: 13: 5. Female genital area ( Figs 2i, 3h): sternite II with 2 setae on each side; sternite III with a row of 8 setae on the posterior margin.

Measurements (length/breadth or depth in mm, ratios in parentheses). Male. Body length 1.90–2.02. Carapace 0.56×0.47 (1.19). Chelicera 0.36–0.37×0.19 (1.89–1.95), movable finger length 0.26. Pedipalpal trochanter 0.31×0.20 (1.55), femur 0.55–0.59×0.20–0.21 (2.75– 2.81), patella 0.49–0.52×0.23 (2.13–2.26), chela (with pedicel) 0.93–0.97×0.29–0.31 (3.13–3.21), chela (without pedicel) 0.86–0.90×0.29–0.31 (2.90–2.97), hand length (without pedicel) 0.38, movable finger length 0.49–0.53 (1.29–1.39×hand). Leg I: trochanter 0.14×0.10 (1.40), femur 0.28–0.30×0.12 (2.33–2.50), patella 0.20×0.10 (2.00), tibia 0.27–0.28×0.07 (3.86–4.00), basitarsus 0.12×0.05 (2.40), telotarsus 0.19–0.21×0.05 (3.80–4.20). Leg IV: trochanter 0.16×0.13 (1.23), femur + patella 0.54–0.59×0.21–0.22 (2.57–2.68), tibia 0.45–0.47×0.11 (4.09–4.27), basitarsus 0.15×0.08 (1.88), telotarsus 0.27×0.07 (3.86).

Female. Body length 2.09–2.17. Carapace 0.60–0.63×0.49–0.51 (1.22–1.24). Chelicera 0.39×0.20 (1.95), movable finger length 0.28. Pedipalpal trochanter 0.35–0.37×0.20 (1.75– 1.85), femur 0.56×0.21 (2.67), patella 0.49×0.24 (2.04), chela (with pedicel) 0.97–1.03×0.34 (2.85–3.03), chela (without pedicel) 0.90–0.95×0.34 (2.65–2.79), hand length (without pedicel) 0.41–0.43, movable finger length 0.49–0.52 (1.20–1.21×hand). Leg I: trochanter 0.14×0.10 (1.40), femur 0.28×0.12 (2.33), patella 0.22×0.11 (2.00), tibia 0.27–0.29×0.07 (3.86–4.14), basitarsus 0.12×0.06 (2.00), telotarsus 0.19×0.06 (3.17). Leg IV: trochanter 0.19×0.14 (1.36), femur + patella 0.55–0.58×0.21–0.23 (2.52–2.62), tibia 0.46–0.48×0.11 (4.18–4.36), basitarsus 0.15×0.08 (1.88), telotarsus 0.27×0.07 (3.86).

Distribution. China (Hunan).

Remarks. The other Bisetocreagris species with comparable pedipalpal size (pedipalpal femur 0.55–0.59, patella 0.49–0.52 mm in length) are B. pygmaea (Ellingsen, 1907) , B. philippinensis (Beier, 1931) , B. afghanica (Beier, 1959) , B. furax (Beier, 1959) , B. klapperichi (Beier, 1959) and B. thailandica Schwaller, 1994 . Bisetocreagris shunhuangensis can be distinguished from these species by: pedipalpal femur smooth (pedipalpal femur with granulations in B. philippinensis , B. furax , B. klapperichi and B. pygmaea ); pedipalpal femur 2.67–2.81 (4.20 in B. furax ; 3.60 in B. afghanica ; 4.00 in B. klapperichi ) times longer than broad; pedipalpal femur obviously longer than patella (femur shares with patella a similar length in B. thailandica ); fixed chelal finger with 36–38, movable finger with 43–45 teeth (chelal finger with 50–54 teeth in B. philippinensis ; chelal finger with 45–50 teeth in B. thailandica ).