Belisana menglun Yao & Li, 2020

Zhu, Wenhui, Yao, Zhiyuan, Zheng, Guo & Li, Shuqiang, 2020, Three new species of the spider genus Belisana Thorell, 1898 (Araneae: Pholcidae) from Xishuangbanna, Yunnan, China, Zootaxa 4742 (2), pp. 332-342 : 334

Belisana menglun Yao & Li sp. nov.

Figs 3–4

Type material. Holotype: Male ( IZCAS Ar39747), 48 Kilometer Nature Reserve (21°58’42.2”N, 101°19’44.9”E, elevation 1088 ± 12 m), Menglun Town , Mengla County, Xishuangbanna, Yunnan, China, 12 August 2011, G. Zheng, Q. Zhao and C. Gao leg.

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

Diagnosis. This species resembles B. colubrina Zhang & Peng, 2011 (see Zhang & Peng 2011: 40, fig. 9) with similar male chelicerae ( Fig. 4B ) and bulbal apophyses ( Fig. 4A ) but can be distinguished by presence of large prolateral sclerite distally (arrow 1 in Fig. 3C ), bifid prolateral apophysis distally (arrow 2 in Fig. 3C ) and small dorsal membranous process distally (arrow 3 in Fig. 3C ) on procursus, and by absence of lateral marks on carapace ( Fig. 4C ), along with the absence of spots on opisthosoma ( Fig. 4C ).

Description. Male (holotype): Total length 1.80 (1.89 with clypeus), carapace 0.72 long, 0.70 wide, opisthosoma 1.08 long, 0.50 wide. Legs I and III missing, leg II: — (3.00 + 0.30 + 2.68 + – + –), leg IV: 6.83 (1.92 + 0.23 + 1.80 + 2.24 + 0.64). Habitus as in Figs 4 C–E. Carapace and sternum pale, without marks. Legs II and IV pale, without darker rings. Opisthosoma pale, without spots. Distance PME-PME 0.13, diameter PME 0.08, distance PME-ALE 0.03, AME absent. Ocular area not elevated. Thoracic furrow absent. Clypeus unmodified. Sternum slightly wider than long (0.62/0.58). Chelicerae ( Fig. 4B ) with pair of small proximo-lateral apophyses and pair of long, curved distal apophyses each provided with modified seta on its tip (distance between tips: 0.62). Pedipalps as in Figs 3 A–B; coxa unmodified; trochanter with short retrolatero-ventral apophysis (arrow in Fig. 3A ); femur with small dorsal apophysis proximally (arrow in Fig. 3A ); procursus ( Figs 3 A–D) simple proximally but complex distally, with large prolateral sclerite distally (arrow 1 in Fig. 3C ), bifid prolateral apophysis distally (arrow 2 in Fig. 3C ) and small dorsal membranous process distally (arrow 3 in Fig. 3C ); bulb ( Fig. 4A ) with long curved apophysis and wide embolus.

Female: Unknown.

Distribution. China (Yunnan, type locality; Fig. 7 ).

Figures

FIGURE 3. Belisana menglun sp. nov., holotype male. A–B. Flipped right pedipalp (A. Prolateral view, two arrows point at retrolatero-ventral apophysis on trochanter and dorsal apophysis on femur; B. Retrolateral view); C–D. Distal part of flipped procursus (C. Prolateral view, arrow 1 points at large prolateral sclerite, arrow 2 points at bifid prolateral apophysis, arrow 3 points at small dorsal membranous process; D. Retrolateral view). b = bulb, ba = bulbal apophysis, e = embolus, pr = procursus. Scale bars: 0.02 (A–B), 0.01 (C–D).

FIGURE 4. Belisana menglun sp. nov., holotype male. A. Bulb, prolateral view; B. Chelicerae, frontal view; C–E. Habitus (C. Dorsal view; D. Lateral view; E. Ventral view). b = bulb, ba = bulbal apophysis, da = distal apophysis, e = embolus, pa = proximo-lateral apophysis. Scale bars: 0.10 (A–B), 0.20 (C–E).

FIGURE 7. Distribution records of three new Belisana species. 1. B. mengla Yao & Li sp. nov.; 2. B. menglun Yao & Li sp. nov.; 3. B. mengyang Yao & Li sp. nov.