Belisana yunnan Zhang, Li & Yao 2024, sp. nov.
Creators: name: Zhang, Ludan
name: Wu, Zheng
name: Li, Shuqiang
name: Yao, Zhiyuan
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Araneae
Pholcidae
Belisana
Belisana yunnan

description: Belisana yunnan Zhang, Li & Yao sp. nov.
Figs 16, 17, 19 C, D, 21 E, F
Type material.
Holotype ♂ (IZCAS - Ar 44981) and paratype s 2 ♂ (IZCAS - Ar 44982–83) 3 ♀ (IZCAS - Ar 44984–86), Xianren Cave (24 ° 13.929 ' N, 98 ° 25.563 ' E, 1636 m), Luxi, Dehong, Yunnan, China, 24 / 08 / 2010, C Wang, Q Zhao & L Lin leg.
Etymology.
The specific name refers to the type locality, which is a noun in apposition.
Diagnosis.
The new species resembles B. yuhaoi Yang & Yao, 2023 (Yang et al. 2023: 178, figs 2 A, B, 3 A – D, 4 A – H) by having similar bulbal apophyses and epigyne (Figs 17 A, C, 21 E), but can be distinguished by differences in males: tips of cheliceral distal apophyses closer to each other (Fig. 17 D vs widely separated), procursus without sclerotized dorso-subdistal apophysis (Figs 16 C, 19 C vs present) and with nearly half-round retrolateral flap (Figs 16 D, 19 D vs angular); differences in females: epigynal pockets closer to each other (Figs 17 A, B, 21 E, F vs widely separated), pore plates nearly isosceles triangle-shaped (Figs 17 B, 21 F vs scalene triangle-shaped).
Description.
Male (holotype): Total length 1.90 (1.98 with clypeus), carapace 0.79 long, 0.71 wide, opisthosoma 1.11 long, 0.87 wide. Leg I: 18.71 (4.85, 0.56, 4.75, 7.05, 1.50), leg III: 9.35 (2.66, 0.30, 2.25, 3.25, 0.89), legs II and IV missing; tibia I L / d: 59. Eye inter-distances and diameters: PME – PME 0.11, PME 0.08, PME – ALE 0.03, AME absent. Sternum width / length: 0.63 / 0.60. Habitus as in Fig. 17 E, F. Carapace yellowish, with brown radiating marks; sternum yellowish. Legs whitish, without darker rings. Opisthosoma yellowish, without spots. Thoracic furrow absent. Clypeus unmodified. Chelicerae (Fig. 17 D) with a pair of proximo-lateral apophyses and a pair of curved distal apophyses (distance between tips: 0.19). Palp as in Fig. 16 A, B; trochanter with ventral apophysis (as long as wide, arrow 1 in Fig. 16 B); femur with tiny retrolatero-proximal protrusion (arrow 2 in Fig. 16 B); procursus simple proximally but complex distally, with prolatero-ventral membranous lamella (arrow 1 in Figs 16 C, 19 C) bearing median sclerotized part, distal membranous lamella (arrow 2 in Figs 16 C, 19 C) bearing median sclerotized part, distal spine (arrow 3 in Figs 16 C, 19 C), and nearly half-round retrolateral flap (Figs 16 D, 19 D); bulb (Fig. 17 C) with hooked apophysis and simple embolus. Retrolateral trichobothria on tibia I at 14 % proximally; legs with short vertical setae on metatarsi; tarsus I with 21 distinct pseudosegments.
Female (paratype, IZCAS - Ar 44984): Similar to male, habitus as in Fig. 17 G, H. Total length 2.14 (2.20 with clypeus), carapace 0.78 long, 0.77 wide, opisthosoma 1.36 long, 1.00 wide; tibia I: 3.88; tibia I L / d: 52. Eye inter-distances and diameters: PME – PME 0.13, PME 0.07, PME – ALE 0.02. Sternum width / length: 0.62 / 0.56. Epigyne (Figs 17 A, 21 E) simple and flat, anteriorly slightly sclerotized, with a pair of postero-median pockets 0.12 apart. Vulva (Figs 17 B, 21 F) with ridge-shaped anterior arch and a pair of nearly triangular pore plates.
Variation.
Tibia I in two male paratypes (IZCAS - Ar 44982 –83): 5.38, 6.73. Tibia I in the other two female paratypes (IZCAS - Ar 44985 –86): 3.72, 3.85.
Habitat.
The species was found in the dark zone inside the cave.
Distribution.
China (Yunnan, type locality; Fig. 1).
description: Published as part of Zhang, Ludan, Wu, Zheng, Li, Shuqiang & Yao, Zhiyuan, 2024, Eight new spider species of Belisana Thorell, 1898 (Araneae, Pholcidae), with an updated overview of Belisana species from Yunnan, China, pp. 255-286 in ZooKeys 1202 on pages 255-286, DOI: 10.3897/zookeys.1202.121633