Taxon classification Animalia Araneae Pholcidae

Belisana denticulata sp. n. Figs 1, 2, 3, 4

Type material.

Holotype: ♂, fogging, natural forest (21°31.501'N, 105°33.434'E, elevation 1060 m), Tam Dao National Park, Vinh Phuc, Vietnam, 26 July 2008, D.S. Pham leg. Paratype: 1 ♂, same data but disturbed forest (21°28.337'N, 105°38.094'E, elevation 1007 m).

Etymology .

The specific name is derived from the Latin denticulatus (with small teeth), in reference to the small teeth on the prolateral sclerite of the distal procursus; adjective.

Diagnosis.

This species resembles Belisana scharffi Huber, 2005 (see Huber 2005: 20, figs 9-10, 65, 136-153), but can be distinguished by relatively long distance between proximal parts of proximo-lateral apophysis and distal apophysis on male chelicerae (Figs 2B, 3C), by presence of a nearly saddle-shaped prolateral sclerite on procursus (arrows in Figs 1A, C, 3A), and by different shape of retrolateral membranous flap on procursus (Fig. 3B).

Description.

Male (holotype): Total length 1.97 (2.09 with clypeus), prosoma 0.74 long, 0.80 wide, opisthosoma 1.23 long, 0.84 wide. Leg I: - (3.72 + 0.36 + - + - + -), leg II: 10.78 (2.95 + 0.34 + 2.62 + 3.89 + 0.98), leg III: 6.96 (1.87 + 0.30 + 1.72 + 2.41 + 0.66), leg IV: 9.22 (2.60 + 0.31 + 2.34 + 3.25 + 0.72). Habitus as in Fig . 2 C–E . Dorsal shield of prosoma yellowish, with brown lateral margins; sternum yellowish, without marks. Legs yellowish, without darker rings. Opisthosoma yellowish, without spots. Distance PME-PME 0.21, diameter PME 0.09, distance PME-ALE 0.02, AME absent. Ocular area not elevated. Thoracic furrow absent. Clypeus unmodified. Sternum wider than long (0.61/0.57). Chelicerae (Figs 2B, 3C) with a pair of thumb-shaped proximo-lateral apophyses and a pair of long, curved distal apophyses (distance between tips: 0.42). Pedipalps as in Figs 1 A–B, 3 A–B; trochanter with a short retrolatero-ventral apophysis; femur with a small dorsal apophysis; procursus simple proximally but complex distally, with a prolateral sclerite provided with small teeth, a small membranous flap retrolaterally and a curved spine; bulb with a hooked apophysis and a simple embolus. Legs with short vertical hairs on metatarsi, without spines and curved hairs.

Variation. In another male: Tibia I: 3.37; tibia I L/d: 45. Retrolateral trichobothrium of tibia I at 13% proximally; tarsus I with about 12 distinct pseudosegments.

Female. Unknown.

Distribution.

Known from two nearby localities in Tam Dao National Park (Fig. 4).