Belisana tianyang Zhang, Li & Yao 2024, sp. nov.

Belisana tianyang Zhang, Li & Yao sp. nov. Figs 6, 7, 8 E, F, 9 E, F Type material. Holotype: China • ♂; Guangxi, Baise, Tianyang County, Dongjing Town, Liangdongyan Cave; 23 ° 40.123 ' N, 106 ° 33.956 ' E; alt. 467 m; 7 Aug. 2011; C Wang leg.; IZCAS - Ar 44997. Paratypes: China • 3 ♂; same data as for holotype; IZCAS - Ar 44998 –45000 • 2 ♀; same data as for holotype; IZCAS - Ar 45001 –02. Etymology. The specific name refers to the type locality; noun in apposition. Diagnosis. The new species resembles B. tianlinensis Zhang & Peng, 2011 (Zhang and Peng 2011: 65, fig. 10 A – G) by having similar bulbal apophyses and epigyne (Fig. 7 A, C), but can be distinguished by retrolateral flap of procursus strongly curved and wide (4 times wider than long, f in Figs 6 D, 8 F vs. straight and 2 times wider than long in B. tianlinensis), by male cheliceral distal apophyses long (6 times longer than wide) and tips widely separated (da in Fig. 7 D vs. 2 times longer than wide and tips closer to each other in B. tianlinensis), by pore plates curved, anteriorly pointed and posteriorly wide (pp in Figs 7 B, 9 F vs. nearly triangular in B. tianlinensis), and by male clypeus unmodified (Fig. 7 E vs. with pointed frontal apophysis in B. tianlinensis); also distinguished from B. douqing Chen, Zhang & Zhu, 2009 (Chen et al. 2009: 59, figs 1–11) by procursus with rectangular distal membranous lamella (arrow 3 in Figs 6 C, 8 E vs. nearly square in B. douqing) and curved retrolateral membranous flap (f in Figs 6 D, 8 F vs. angular in B. douqing) and by pore plates curved, anteriorly pointed and posteriorly wide (pp in Figs 7 B, 9 F vs. long elliptic in B. douqing). Description. Male (holotype): Total length 1.98 (2.08 with clypeus), prosoma 0.74 long, 0.75 wide, opisthosoma 1.24 long, 0.89 wide. Leg I: 21.95 (5.51, 0.33, 5.44, 9.17, 1.50), leg II missing, leg III: 8.82 (2.44, 0.27, 2.25, 3.13, 0.73), leg IV: 12.12 (3.60, 0.28, 3.04, 4.45, 0.75); tibia I L / d: 68. Eye interdistances and diameters: PME – PME 0.10, PME 0.08, PME – ALE 0.02, AME absent. Sternum width / length: 0.58 / 0.56. Habitus as in Fig. 7 E, F. Dorsal shield of prosoma yellowish, with indistinct median stripe; sternum yellowish, without marks. Legs whitish, without darker rings. Opisthosoma yellowish, without spots. Thoracic furrow absent. Clypeus unmodified. Chelicerae with pair of proximo-lateral apophyses (pa in Fig. 7 D) and pair of distal apophyses (da in Fig. 7 D; distance between tips: 0.36). Palp as in Fig. 6 A, B; trochanter with ventral apophysis (arrow 1 in Fig. 6 B); femur with small retrolatero-proximal protrusion (arrow 2 in Fig. 6 B); procursus simple proximally but complex distally, with prolatero-subdistal sclerite (arrow 1 in Figs 6 C, 8 E), sclerotized prolatero-ventral lamella (arrow 2 in Figs 6 C, 8 E), distal membranous lamella (arrow 3 in Figs 6 C, 8 E), curved distal spine (arrow 4 in Figs 6 C, 8 E), sclerotized dorso-subdistal apophysis (arrow in Figs 6 D, 8 F), and retrolateral membranous flap (f in Figs 6 D, 8 F); bulb with hooked apophysis (ba in Fig. 7 C) and simple embolus (e in Fig. 7 C). Retrolateral trichobothria on tibia I at 5 % proximally; legs with short vertical setae on metatarsi; tarsus I with 19 distinct pseudosegments. Female (paratype, IZCAS - Ar 45001): Similar to male, habitus as in Fig. 7 G, H. Total length 2.14 (2.27 with clypeus), prosoma 0.70 long, 0.79 wide, opisthosoma 1.44 long, 1.32 wide; tibia I: 4.15; tibia I L / d: 52. Eye interdistances and diameters: PME – PME 0.10, PME 0.08, PME – ALE 0.02, AME absent. Sternum width / length: 0.55 / 0.54. Epigyne simple and flat, with pair of lateral pockets 0.36 apart (ep in Figs 7 A, 9 E). Vulva with ridge-shaped anterior arch (aa in Figs 7 B, 9 F) and pair of curved, anteriorly pointed and posteriorly wide pore plates (pp in Figs 7 B, 9 F). Variation. Tibia I in three male paratypes (IZCAS - Ar 44998 –45000): 5.38, 5.64, 5.77. Tibia I in another female paratype (IZCAS - Ar 45002) missing. Habitat. The species was found in the dark zone inside the cave. Distribution. China (Guangxi, type locality; Fig. 1).