Belisana xuanguan Yao & Li, 2020

Zhu, Wenhui, Yao, Zhiyuan, Zheng, Guo & Li, Shuqiang, 2020, Six new species of the spider genus Belisana Thorell, 1898 (Araneae: Pholcidae) from southern China, Zootaxa 4810 (1), pp. 175-197 : 185-190

Belisana xuanguan Yao & Li sp. nov.

Figs 9–10 , 13 I–J

Type material. Holotype: Male ( IZCAS Ar39949), Xuanguan Cave (22°37’25.28”N, 107°54’03.71”E, elevation 96 m), Duxiushan Mountain , Fusui County, Chongzuo, Guangxi, China, 10 July 2011, C. Wang leg.

Etymology. The specific name refers to the type locality and is a noun in apposition.

Diagnosis. This species resembles B. minneriya Huber, 2019 (see Huber 2019: 2, figs 1–3, 10–16, 36–37) with similar retrolateral view of procursus ( Figs 9B, 9D , 13J ) and bulbal apophyses ( Fig. 10A ), but can be distinguished by medially protruding prolatero-dorsal sclerite of procursus (arrow 1 in Figs 9C , 13I ; prolatero-dorsal sclerite protruding proximally in B. minneriya ), by presence of small proximo-dorsal hump on male pedipalpal femur (arrow in Fig. 9B ; dorsal hump absent in B. minneriya ), by having male cheliceral distal apophyses directed toward frontally (arrow da in Fig. 10B ; distal apophyses directed toward laterally in B. minneriya ), and by long legs and leg formula: I-II-IV-III (very short legs and leg formula: I-IV-II-III in B. minneriya ).

Description. Male (holotype, IZCAS Ar39949): Total length 1.34 (1.50 with clypeus), carapace 0.56 long, 0.56 wide, opisthosoma 0.78 long, 0.63 wide. Leg I: 10.62 (2.88 + 0.38 + 2.82 + 3.39 + 1.15), leg II: 7.05 (2.05 + 0.26 + 1.79 + 2.18 + 0.77), leg III missing, leg IV: 6.42 (1.99 + 0.26 + 1.67 + 1.99 + 0.51); tibia I L/d: 47. Distance PME-PME 0.13, diameter PME 0.06, distance PME-ALE 0.06, AME absent. Sternum approximately as wide as long (0.38). Habitus as in Figs 10 C–E. Carapace and sternum pale, without marks. Legs pale, without darker rings. Opisthosoma pale, without spots. Ocular area not elevated. Thoracic furrow absent. Clypeus unmodified. Chelicerae ( Fig. 10B ) with pair of small proximo-lateral apophyses and pair of long, curved distal apophyses each with hardened and pointed tip (distance between tips of distal apophyses: 0.30). Pedipalps as in Figs 9 A–B; coxa unmodified; trochanter with short retrolatero-ventral apophysis; femur with small proximo-dorsal hump (arrow in Fig. 9B ); procursus ( Figs 9 A–D, 13I–J) simple proximally but complex distally, with small, subdistal prolatero-dorsal sclerite (arrow 1 in Figs 9C , 13I ), large, distal membranous lamella (arrow 2 in Figs 9C , 13I ), small subdisto-prolateral sclerite (arrow 3 in Figs 9C , 13I ) and large retrolateral membranous flap (arrow f in Figs 9D , 13J ), without distal spine; bulb ( Fig. 10A ) with long hooked apophysis and simple embolus. Retrolateral trichobothria of tibia I at 16% proximally; legs with short vertical setae on metatarsi, without spines and curved setae; tarsus I with 12 distinct pseudosegments.

Female: Unknown.

Natural history. The species was found underside of rocks in the aphotic zone inside the cave.

Distribution. China (Guangxi, type locality only; Fig. 15 ).

Figures

FIGURE 9. Belisana xuanguan sp. nov., holotype male. A–B. Pedipalp (A. Prolateral view; B. Retrolateral view, arrow points at small proximo-dorsal hump on pedipalpal femur); C–D. Distal part of procursus (C. Prolateral view, arrow 1 points at small, subdistal prolatero-dorsal sclerite, arrow 2 points at large, distal membranous lamella, arrow 3 points at small subdisto-prolateral sclerite; D. Retrolateral view). b = bulb, ba = bulbal apophysis, e = embolus, f = flap, pr = procursus. Scale bars: 0.05 (A–B), 0.02 (C–D).

FIGURE 10. Belisana xuanguan sp. nov., holotype male. A. Bulb, prolateral view; B. Chelicerae, frontal view; C–E. Habitus (C. Dorsal view; D. Ventral view; E. Lateral view). b = bulb, ba = bulbal apophysis, da = distal apophysis, e = embolus, pa = proximo-lateral apophysis. Scale bars: 0.05 (A–B), 0.20 (C–E).

FIGURE 13. Drawings of male left procursus in prolateral and retrolateral views (arrows point at same structures as photos of each species, respectively). A–B. B. guilin sp. nov.; C–D. B. maoer sp. nov.; E–F. B. naling sp. nov.; G–H. B. xiyuan sp. nov.; I–J. B. xuanguan sp. nov.; K–L. B. yuexiu sp. nov. f = flap. Scale bars: 0.05.

FIGURE 15. Distribution records of six new species of the genus Belisana from southern China. 1. B. guilin sp. nov.; 2. B. maoer sp. nov.; 3. B. naling sp. nov.; 4. B. xiyuan sp. nov.; 5. B. xuanguan sp. nov.; 6. B. yuexiu sp. nov.