Allochthonius hispidus, Hou & Zhang, 2024

Hou, Yanmeng & Zhang, Feng, 2024, Three new species of dragon pseudoscorpions (Pseudoscorpiones, Pseudotyrannochthoniidae) from China, ZooKeys 1204, pp. 135-154 : 135-154

Allochthonius hispidus sp. nov.

Figs 1 , 2 , 3 , 4

Chinese name.

多毛异伪蝎.

Type materials.

Holotype: China • ♂; Chongqing Municipality, Wushan County, Dangyang Town , Wushanya ; 31 ° 28.356 ′ N, 109 ° 59.172 ′ E; 1740 m a. s. l.; 02 Oct. 2021; Luyu Wang leg. (Fig. 1 ); Ps. - MHBU - CQWLP-21-02-01 . Paratypes: • 2 ♂ 1 ♀; same data as for holotype; Ps. - MHBU - CQWLP-21-02-02–04 • 2 ♂ 1 ♀; Wushan County, Dangyang Town, Qizhi Mountain ; 31 ° 28.109 ′ N, 109 ° 58.716 ′ E; 1475 m a. s. l.; same collector and collection date as for holotype; Ps. - MHBU - CQWLP-21-03-01–03 • 1 ♂ 1 ♀; Wushan County, Dangyang Town, Congping Mountain ; 31 ° 23.786 ′ N, 110 ° 2.467 ′ E; 2150 m a. s. l.; 03 Oct. 2021; same collector as for holotype; Ps. - MHBU - CQWLP-21-07-01 & 02 • 1 ♀; Wushan County, Dangyang Town, Congping Management Station ; 31 ° 23.786 ′ N, 110 ° 2.055 ′ E; 1970 m a. s. l.; 03 Oct. 2021; same collector as for holotype; Ps. - MHBU - CQWLP-21-08-01 • 1 ♂ 1 ♀; Wushan County, Guanyang Town, Pingqian Management Station ; 31 ° 22.379 ′ N, 109 ° 56.287 ′ E; 1832 m a. s. l.; 04 Oct. 2021; same collector as for holotype; Ps. - MSWU - CQWLP- 21-10 - 01 & 02 .

Diagnosis

(♂ ♀). Allochthonius hispidus sp. nov. is most similar to another epigean blind species from China, A. brevitus , but differs from this species in having more carapaceal setae (22–24 (♂), 21 or 22 (♀) for A. hispidus vs 16 (♂ ♀) for A. brevitus ), more cheliceral setae (♂) (10 or 11 vs seven), more numerous chelal fingers teeth (♂) (fixed finger with 26–29 vs 18–20 teeth, movable finger with 22 or 23 vs 17 or 18 teeth), and longer pedipalps (e. g. palpal femur 5.19 (♂), 5.13–5.61 (♀) × vs 4.33–4.73 (♂), 4.79–4.92 (♀) × longer than broad, length 1.09 (♂), 1.18–1.29 (♀) mm vs 0.52–0.57 (♂), 0.64–0.67 (♀) mm; chela length 1.59–1.60 (♂), 1.76–1.84 (♀) mm vs 0.80–0.84 (♂), 0.98–1.01 (♀) mm). It differs from the other blind species in China ( A. bainiensis Gao, Hou & Zhang, 2023 , A. pandus Gao, Hou & Zhang, 2023 , and A. xinqiaoensis Gao, Hou & Zhang, 2023 ) in having more numerous carapaceal setae (♀) (the latter three with only 14 setae) and the presence of a pair of hirsute pedipalps. It also differs from all blind congeners from Japan ( A. yoshizawai Viana & Ferreira, 2021 , A. ishikawai Morikawa, 1954 , and its subspecies) in having more cheliceral setae (♂) (10 or 11 vs at most seven) and more numerous fixed chelal finger teeth (♂) (26–29 vs at most 17).

Etymology.

The specific name is derived from the Latin word hispidus (hirsute, hairy), which refers to the presence of abundant setae on the chela, palpal femur, and patella.

Description.

Adult males (Figs 1 , 2 A , 3 A – G , 4 ). Colour: generally pale yellow; chelicerae, pedipalps and tergites slightly darker; soft parts pale. Cephalothorax (Figs 3 A, C , 4 A, C ): carapace subquadrate, 0.87–0.88 × longer than broad, gently narrowed posteriorly; surface smooth but the posterior lateral parts with squamous sculpturing; without furrows but with five anterior lyrifissures and two posterior lyrifissures; no traces of eyes; epistome absent, space between median setae slightly recurved; with 22–24 setae arranged 12–14: 4: 2: 2: 2, most setae heavy, long and gently curved. Chaetotaxy of coxae: P 3, I 3–4, II 5–6, III 4–5, IV 5; manducatory process with two acuminate distal setae, anterior seta more than 1 / 2 length of medial seta; coxal spines present on coxa I only, consisting of a tubercle expanded terminally into a characteristic spray- or fan-shaped of five elevate processes which extend apically, subequal in length (Figs 3 C , 4 C ); a larger bisetose intercoxal tubercle present between coxae III and IV (Fig. 3 C ). Chelicera (Figs 3 B , 4 B, D ): large, approximately as long as carapace, 2.52 × longer than broad; nine or 10 setae and two lyrifissures (exterior condylar lyrifissure and exterior lyrifissure) present on hand, all setae acuminate, ventrobasal seta shorter than others; movable finger with one medial seta. Cheliceral palm with moderate hispid granulation on both ventral and dorsal sides. Both fingers with well-developed teeth, fixed finger with eight or nine acute teeth, distal one largest, plus five or six small basal teeth, 13–15 in total; movable finger with 15 or 16 retrorse contiguous teeth of equal length; galea absent. Serrula exterior with 20 or 21 blades and serrula interior with 12–14 blades. Rallum in two rows and composed of 11 finely pinnate blades (Fig. 4 D ). Pedipalp (Figs 3 D – F , 4 E – G ): long and slender, trochanter 1.38–1.48, femur 5.19, patella 2.62–2.89, chela 4.82–5.16, hand 1.79–1.90 × longer than broad; femur 1.98 × longer than patella; movable chelal finger 1.73–1.76 × longer than hand and 0.64–0.65 × longer than chela. Setae generally long and acuminate; one distal lyrifissure present on patella (Figs 3 E , 4 F ). Chelal palm robust and slightly constricted towards fingers. Fixed chelal finger and hand with eight trichobothria plus duplex trichobothrium (dt), movable chelal finger with four trichobothria, ib, isb, eb, esb, and ist clustered at the base of fixed finger, ist slightly distal to esb; it slightly distal to est, situated subdistally; et situated subdistally, very close to chelal teeth; dt situated distal to et, near the tip of fixed finger; sb situated closer to b than to st (Fig. 4 E ). Abundant setae present on palpal femur, patella, and chela. Sensilla absent. Both chelal fingers with a row of teeth, homodentate, spaced regularly along the margin, larger and well-spaced teeth present in the middle of the row, becoming smaller and closer distally and proximally: fixed chelal finger with 26–29 teeth, slightly retrorse and pointed; movable chelal finger with 22 or 23 teeth (slightly smaller than teeth on fixed chelal finger) and a tubercle between the seventh and eighth teeth (Figs 3 D , 4 E ). Chelal fingers slightly curved in dorsal view (Figs 3 F , 4 G ). Opisthosoma: generally typical, pleural membrane finely granulated. Tergites and sternites undivided; setae uniseriate and acuminate. Tergal chaetotaxy I – XII: 2: 6–8: 8–10: 10–11: 10–11: 11–12: 10–13: 13–14: 8: 6: TT: 0. Sternal chaetotaxy III – XII: 12–14: 15–17: 14–15: 12–15: 12–14: 13–14: 12: 8–9: 0: 2. Anterior genital operculum with eight or nine setae, genital opening pit-like, with seven or 10 marginal setae on each side, 26 in total, with a pair of lyrifissures present anterolateral and posterolateral to genital opening, respectively (Fig. 3 G ). Legs (Fig. 4 H, I ): generally typical, long, and slender. Fine granulation present on anterodorsal faces of femur IV and patella IV. Femur of leg I 1.45 × longer than patella and with two lyrifissures at the base of femur; tarsus 2.00 × longer than tibia. Femoropatella of leg IV 3.48–3.70 × longer than deep and with one lyrifissure at the base of femur; tibia 5.25–5.67 × longer than deep; with basal tactile setae on both tarsal segments: basitarsus 3.44–3.56 × longer than deep (TS = 0.25–0.32), telotarsus 8.86–9.14 × longer than deep and 2.00 × longer than basitarsus (TS = 0.17–0.21). Arolium slightly shorter than the claws, not divided; claws simple. Dimensions of adult males (length / breadth or, in the case of the legs, length / depth in mm): body length 2.72–2.78. Pedipalps: trochanter 0.29–0.31 / 0.21, femur 1.09 / 0.21, patella 0.55 / 0.19–0.21, chela 1.59–1.60 / 0.31 – 0.33, hand 0.59 / 0.31–0.33, movable finger length 1.02–1.04. Chelicera 0.68 / 0.27, movable finger length 0.36–0.38. Carapace 0.56–0.58 / 0.64 – 0.67. Leg I: trochanter 0.19–0.20 / 0.17 – 0.18, femur 0.55 / 0.11, patella 0.38 / 0.09–0.10, tibia 0.31–0.32 / 0.08, tarsus 0.62–0.64 / 0.06. Leg IV: trochanter 0.31–0.32 / 0.18 – 0.19, femoropatella 0.80–0.85 / 0.23, tibia 0.63–0.68 / 0.12, basitarsus 0.31–0.32 / 0.09, telotarsus 0.62–0.64 / 0.07.

Adult females (Figs 2 B , 3 H ). Mostly same as males but a little larger (i. e. body length is about 1.08 × that of males); cheliceral hand of one female with 11 setae; chaetotaxy of coxae: P 3, I 4, II 4–5, III 5, IV 5; tergal chaetotaxy I – XII: 2: 6: 6–8: 10: 10–11: 11–12: 12: 11–12: 8–9: 5: TT: 0; sternal chaetotaxy IV – XII: 15–17: 11–13: 13–14: 13–14: 13: 12–14: 9: 0: 2; anterior genital operculum with eight setae, posterior margin with 15 or 17 marginal setae, 23–25 in total; leg IV with a long tactile seta on both tarsal segments: basitarsus 3.33–3.50 × longer than deep (TS = 0.37–0.40), telotarsus 9.57–11.00 × longer than deep and 1.91–2.20 × longer than basitarsus (TS = 0.20–0.21). Body length 2.44–2.97. Pedipalps: trochanter 0.32–0.37 / 0.22 – 0.24 (1.33–1.68 ×), femur 1.18–1.29 / 0.23 (5.13–5.61 ×), patella 0.59–0.60 / 0.22 – 0.24 (2.46–2.73 ×), chela 1.76–1.84 / 0.34 – 0.41 (4.49–5.18 ×), hand 0.64–0.68 / 0.34 – 0.41 (1.66–1.88 ×), movable chelal finger length 1.15–1.20. Chelicera 0.77–0.81 / 0.32 – 0.36 (2.25–2.41 ×), movable finger length 0.42–0.46. Carapace 0.58–0.64 / 0.72 – 0.83 (0.77–0.81 ×). Leg I: trochanter 0.23 / 0.19 (1.21 ×), femur 0.56–0.61 / 0.11 – 0.12 (4.67–5.55 ×), patella 0.38–0.39 / 0.10 – 0.11 (3.55–3.80 ×), tibia 0.35 / 0.07–0.08 (4.38–5.00 ×), tarsus 0.68–0.69 / 0.06 – 0.07 (9.71–11.50 ×). Leg IV: trochanter 0.33–0.35 / 0.20 (1.65–1.75 ×), femoropatella 0.85–0.90 / 0.25 (3.40–3.60 ×), tibia 0.68 / 0.13–0.14 (4.86–5.23 ×), basitarsus 0.30–0.35 / 0.09 – 0.10 (3.33–3.50 ×), telotarsus 0.66–0.67 / 0.06 – 0.07 (9.57–11.00 ×).

Distribution.

China (Chongqing).

Figures

Figure 1. Distribution of all Pseudotyrannochthoniidae species in China. 1 Allochthonius liaoningensis Hu & Zhang, 2012 2 A. exornatus Gao & Zhang, 2013 3 A. wui Hu & Zhang, 2011 4 A. jingyuanus Zhang & Zhang, 2014 5 A. brevitus 6 A. sichuanensis (Schawaller, 1995) 7 A. hispidus sp. nov. 8 A. lini Li, 2023 9 A. xuae Li, 2023 10 A. bainiensis 11 A. pandus 12 A. xinqiaoensis 13 A. fanjingshan Gao, Zhang & Zhang, 2016 14 A. trigonus Hu & Zhang, 2011 15 A. fuscus Hu & Zhang, 2011 16 Centrochthonius kozlovi (Redikorzev, 1918) 17 C. cheni (Gao, Zhang & Zhang, 2016) 18 Spelaeochthonius huanglaoensis sp. nov. 19 S. tuoliangensis sp. nov. 20 S. yinae 21 S. wulibeiensis.

Figure 2. Allochthonius hispidus sp. nov. A holotype male, habitus (dorsal view) B paratype female, habitus (dorsal view). Scale bars: 0.50 mm.

Figure 3. Allochthonius hispidus sp. nov. A carapace (dorsal view) B left chelicera (dorsal view) C coxae (ventral view) D left chela (lateral view) E left pedipalp (minus chela, dorsal view) F left chela (dorsal view) G male genital area (ventral view) H female genital area (ventral view). Scale bars: 0.20 mm (C – F); 0.10 mm (A, B, G, H).

Figure 4. Allochthonius hispidus sp. nov., holotype male A carapace (dorsal view) B left chelicera (dorsal view), with details of teeth C coxal spines on coxae I (ventral view) D rallum E left chela (lateral view), with details of trichobothrial pattern F left pedipalp (minus chela, dorsal view) G left chela (dorsal view) H leg I (lateral view) I leg IV (lateral view). Scale bars: 0.20 mm.