Belisana bachma, Zhu & Li, 2021

Zhu, Wenhui & Li, Shuqiang, 2021, Six new species of the spider genus Belisana (Araneae: Pholcidae) from Southeast Asia, Zootaxa 4963 (1), pp. 115-137 : 116-119

publication ID	https://doi.org/ 10.11646/zootaxa.4963.1.5
publication LSID	lsid:zoobank.org:pub:6B4B8F71-7B08-4027-A76B-7EE8C987C9BD
DOI	https://doi.org/10.5281/zenodo.4696996
persistent identifier	https://treatment.plazi.org/id/4E3C87F3-FFC0-FF95-C6EC-FBFFFC7BFD5C
treatment provided by	Plazi
scientific name	Belisana bachma
status	sp. nov.

Treatment

Belisana bachma View in CoL sp. nov.

Figs 1–2 View FIGURE 1 View FIGURE 2 , 13A–B View FIGURE 13 , 14A–B View FIGURE 14 , 15A View FIGURE 15

Type material. Holotype: Male ( IZCAS Ar41901), Bach Ma National Park (16°13’45.78”N, 107°50’53.46”E, elevation 371 m), Thua Thien Hue, Vietnam, 27 August 2015, D.S. Pham leg. GoogleMaps Paratypes: 1 male ( IZCAS Ar41902) and 1 female ( IZCAS Ar41903), same data as holotype GoogleMaps .

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

Diagnosis. This species resembles B. babensis Yao, Pham & Li, 2015 (see Yao et al. 2015: 5, figs 1–3) with the elongated bulbal apophyses ( Fig. 2D View FIGURE 2 ) and vulval anterior arch of a similar dark internal shade ( Figs 2B View FIGURE 2 , 14B View FIGURE 14 ), but males can be distinguished by the presence of a strongly conical subdisto-dorsally protruding (arrow in Fig. 1A View FIGURE 1 ) and bifid disto-prolateral spine (arrow 1 in Figs 1C View FIGURE 1 , 13A View FIGURE 13 ) on the procursus, by the presence of a frontal apophysis (arrow in Fig. 2E View FIGURE 2 ) and a pair of small ventral apophyses (arrow in Fig. 2C View FIGURE 2 ) on the clypeus, and the cheliceral distal apophyses are directed laterally (arrow da in Figs. 2C View FIGURE 2 , 15A View FIGURE 15 ; distal apophyses directed anteriorly in B. babensis ). Females can be distinguished by having frontal “epigynal” pockets laterally on a sclerotized plate (arrow ep in Figs 2A–B View FIGURE 2 , 14A–B View FIGURE 14 ) and the vulval pore plates are approximately as wide as long (arrow pp in Figs 2B View FIGURE 2 , 14B View FIGURE 14 ).

Description. Male (holotype, IZCAS Ar41901): Total length 2.01 (2.16 with clypeus), carapace 0.98 long, 0.65 wide, opisthosoma 1.18 long, 0.80 wide. Leg I: 16.89 (4.55 + 0.19 + 4.42 + 6.67 + 1.15), leg II: 11.08 (3.21 + 0.18 + 2.75 + 4.17 + 0.77), leg III: 7.40 (2.24 + 0.16 + 1.86 + 2.56 + 0.58), leg IV: 10.61 (3.14 + 0.17 + 2.69 + 3.97 + 0.64); tibia I L/d: 55. Distance PME-PME 0.17, diameter PME 0.08, distance PME-ALE 0.11, AME absent. Habitus as in Figs 2E–F View FIGURE 2 . Carapace pale, with brown lateral margins. Ocular area with indistinct dark marks and not elevated. Clypeus brown, with frontal apophysis (arrow in Fig. 2E View FIGURE 2 ) and pair of small ventral apophyses (arrow in Fig. 2C View FIGURE 2 ). Chelicerae ( Figs. 2C View FIGURE 2 , 15A View FIGURE 15 ) with pair of small proximo-lateral apophyses and pair of long, curved distal apophyses, each with sclerotized and pointed tip (distance between tips of distal apophyses: 0.38). Sternum pale, approximately as wide as long (0.50). Thoracic furrow absent. Legs pale. Opisthosoma pale, with indistinct large spots. Palp as in Figs 1A–B View FIGURE 1 ; coxa unmodified; trochanter with short ventral apophysis with small retrolateral apophysis (arrow 1 in Fig. 1B View FIGURE 1 ); femur with small proximo-dorsal apophysis (arrow 2 in Fig. 1B View FIGURE 1 ); procursus ( Figs 1A–D View FIGURE 1 , 13A–B View FIGURE 13 ) simple proximally but complex distally, strongly protruding subdisto-dorsally (arrow in Fig. 1A View FIGURE 1 ), with bifid disto-prolateral spine (arrow 1 in Figs 1C View FIGURE 1 , 13A View FIGURE 13 ), large, curved subdisto-prolateral sclerite (arrow 2 in Figs 1C View FIGURE 1 , 13A View FIGURE 13 ), disto-retrolateral membranous lamella (arrow in Figs 1D View FIGURE 1 , 13B View FIGURE 13 ) and tongue-shaped retrolateral flap (arrow f in Figs 1D View FIGURE 1 , 13B View FIGURE 13 ); bulb ( Fig. 2D View FIGURE 2 ) with hooked apophysis and simple embolus. Retrolateral trichobothria of tibia Iat 6% proximally; legs with short, vertical setae on metatarsi, without spines or curved setae; tarsus Iwith 11 distinct pseudopodomeres.

Female (IZCAS Ar41903): Similar to male, habitus as in Figs 2G–H View FIGURE 2 . Total length 2.19 (2.32 with clypeus), carapace 0.75 long, 0.63 wide, opisthosoma 1.16 long, 0.81 wide. Tibia I: 3.70; tibia I L/d: 46. Distance PME-PME 0.13, diameter PME 0.08, distance PME-ALE 0.09, AME absent. Sternum approximately as wide as long (0.56). Ocular area without marks. External female genitalia ( Figs 2A View FIGURE 2 , 14A View FIGURE 14 ) simple and flat, with pair of frontal “epigynal” pockets (arrow ep in Figs 2A–B View FIGURE 2 , 14A–B View FIGURE 14 ), 0.48 apart. Vulva ( Figs 2B View FIGURE 2 , 14B View FIGURE 14 ) with W-shaped anterior arch (median ridge strongly protruding, arrow in Figs 2B View FIGURE 2 , 14B View FIGURE 14 ) and pair of large, nearly trapezoidal pore plates (arrow pp in Figs 2B View FIGURE 2 , 16B View FIGURE 16 ), without serrated sclerites.