Belisana kachin Zhu & Li 2021, sp. nov.

Belisana kachin sp. nov.

Figs 7–8, 13G–H, 14G–H, 15D

Type material. Holotype: Male (IZCAS Ar41907), Roadside between Camp 2 to Ziradum (27°34’38.76”N, 97°04’32.64”E, elevation 1171 m), Hponkanrazi Wildlife Sanctuary, Putao, Kachin, Myanmar, 12 May 2017, Z. Chen & J. Wu leg. Paratypes: 2 females (IZCAS Ar41908–41909), same data as holotype.

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

Diagnosis. This species resembles B. nujiang Huber, 2005 (see Huber 2005: 14, figs 7, 8, 57, 83–87, 93–111) with the elongated distal apophyses on the male chelicerae (Figs. 8C, 15D) and bulbal apophyses (Fig. 8D), but males can be distinguished by the absence of a distal spine and retrolateral flap on the procursus (Fig. 7D, 13H). Females can be distinguished from other species by the external genitalia with an anterior arch extending to the posterior part (arrow in Figs 8B, 14H; anterior arch extending to the median part in B. nujiang) and the different shape of the pore plates (arrow pp in Figs 8B, 14H).

Description. Male (holotype, IZCAS Ar41907): Total length 1.70 (1.76 with clypeus), carapace 0.64 long, 0.62 wide, opisthosoma 1.12 long, 0.60 wide. Leg I: 16.34 (4.49 + 0.25 + 4.10 + 6.35 + 1.15), leg II: 11.13 (3.40 + 0.23 + 2.82 + 3.85 + 0.83), leg III: 7.44 (2.18 + 0.20 + 1.92 + 2.56 + 0.58), leg IV: 9.70 (2.88 + 0.21 + 2.69 + 3.21 + 0.71); tibia I L/d: 43. Distance PME-PME 0.19, diameter PME 0.06, distance PME-ALE 0.08, AME absent. Habitus as in Figs 8E–F. Carapace pale. Ocular area not elevated. Clypeus unmodified. Chelicerae (Figs. 8C, 15D) 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: 0.44). Sternum pale, slightly wider than long (0.53/0.52). Thoracic furrow absent. Legs pale. Opisthosoma pale, without spots. Palps as in Figs 7A–B; coxa unmodified; trochanter with ventral apophysis (arrow in Fig. 7B); femur without proximo-dorsal apophysis; procursus (Figs 7A–D, 13G–H) simple proximally but complex distally, with curved subdisto-dorsal sclerite (arrow 1 in Figs 7C, 13G), large distoprolateral sclerite (arrow 2 in Figs 7C, 13G), inverted L-shaped subdisto-prolateral sclerite (arrow 3 in Figs 7C, 13G) and disto-retrolateral membranous lamella (arrow in Figs 7D, 13H); bulb (Fig. 8D) with hooked apophysis and simple embolus. Retrolateral trichobothria of tibia Iat 5% proximally; legs with short vertical setae on metatarsi, without spines or curved setae; tarsus Iwith 9 distinct pseudopodomeres.

Female (IZCAS Ar41909): Similar to male, habitus as in Figs 8G–H. Total length 1.60 (1.66 with clypeus), carapace 0.60 long, 0.52 wide, opisthosoma 1.06 long, 0.60 wide. Tibia I: 1.75; tibia I L/d: 21. Distance PME-PME 0.13, diameter PME 0.05, distance PME-ALE 0.04, AME absent. Sternum slightly wider than long (0.44/0.42). External female genitalia (Figs 8A, 14G) simple and flat, with pair of frontal “epigynal” pockets laterally on sclerotized plate (arrow ep in Figs 8A–B, 14G–H), 0.42 apart. Vulva (Figs 8B, 14H) with pointed anterior arch extending to posterior part, with scaly edge (arrow in Figs 8B, 14H) and pair of large pore plates (arrow pp in Figs 8B, 14H), without serrated sclerites.

Variation: Tibia Iin another male (IZCAS Ar41908): 4.04.

Natural history. The species was found on domed webs attached to the underside of leaves.

Distribution. Myanmar (Kachin, type locality only; Fig. 16).