Savarna satun Lan & Yao & Zheng & Wongprom & Li 2020, sp. nov.
Creators: name: Lan, Tianqi
name: Yao, Zhiyuan
name: Zheng, Guo
name: Wongprom, Prasit
name: Li, Shuqiang
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Araneae
Pholcidae
Savarna
Savarna satun

description: Savarna satun Yao & Li sp. nov.
Figs 7–8
Type material. Holotype: ♂ (IZCAS-Ar39739), Urai Thong Cave (6°56’13.6’’N, 99°45’52.8’’E, elevation 23 m), La Ngu District, Satun, Thailand, 16 October 2015, P. Wongprom leg. Paratypes: 1♂ (IZCAS-Ar39740), 2♀♀ (IZCAS-Ar39741–Ar39742), same data as holotype.
Etymology. The specific name is a noun in apposition and refers to the type locality.
Diagnosis. The species resembles S. miser (Bristowe, 1952) (see Huber 2005: 78, figs 127–128, 135–137; Huber et al. 2015b: 18, figs 34–35, 38–39, 74–85) with similar male chelicerae (Fig. 8D) but can be distinguished by presence of large sclerite on ventral ‘knee’ of procursus (arrow in Fig. 7B), dorsal apophysis of procursus strongly protruding subdistally (arrow in Fig. 7C), large distal apophysis on embolus (arrow 1 in Fig. 8C), discontiguous pore plates on vulva (Fig. 8B), and by absence of semicircular posterior extensions on epigynum (Fig. 8A).
Description. Male (holotype, IZCAS-Ar39739): Total length 2.34 (2.48 with clypeus), prosoma 0.80 long, 0.98 wide, opisthosoma 1.54 long, 1.04 wide. Leg I: 24.14 (6.02 + 0.45 + 5.73 + 9.31 + 2.63), leg II: 15.93 (4.49 + 0.40 + 3.91 + 5.57 + 1.56), leg III: 10.95 (3.12 + 0.35 + 2.68 + 3.74 + 1.06), leg IV: 14.28 (4.21 + 0.36 + 3.52 + 5.13 + 1.06); tibia I L/d: 52; leg formula: I-II-IV-III. Distance PME-PME 0.14, diameter PME 0.11, distance PME-ALE 0.03, AME absent. Sternum wider than long (0.68/0.46). Habitus as in Figs 8 E–F. Dorsal shield of prosoma yellowish, with black margins and narrow, black median line behind ocular area; ocular area and clypeus dark brown; sternum black. Legs brownish, but slightly whitish on distal parts of femora and tibiae. Opisthosoma yellowish, with black subcuticular spots lying above deeper white spots dorsally and laterally and distinct ventral pattern consisting of three interconnected black marks. Ocular area elevated, each eye triad on top of short, laterally directed hump. Thoracic furrow deep. Clypeus with pair of slightly pointed processes at rim furnished with strong and long hairs. Chelicerae as in Fig. 8D, with pair of proximo-lateral apophyses. Palps as in Figs 7 A–B, trochanter with small dorsal apophysis (arrow in Fig. 7A) and long ventral apophysis proximally attached to femur; procursus (Figs 7 C–D) simple proximally but complex distally, with distinctive membranous and sclerotized elements; bulb (Fig. 8C) with proximal sclerite and sclerotized embolus (provided with large distal apophysis, arrow 1 in Fig. 8C) apparently containing sperm duct (sperm duct opening visible, arrow 2 in Fig. 8C). Retrolateral trichobothrium of tibia I at 5% proximally; prolateral trichobothrium absent on tibia I, present on other tibiae; legs with short spines in single ventral row on femur I, with vertical hairs in higher than usual density on all tibiae, without curved hairs; tarsus I with 10 distinct pseudosegments.
Female (paratype, IZCAS-Ar39741): Similar to male, habitus as in Figs 8 G–H. Total length 2.94 (3.10 with clypeus), prosoma 0.90 long, 0.96 wide, opisthosoma 2.04 long, 1.36 wide. Leg I: 26.54 (6.74 + 0.51 + 6.28 + 10.13 + 2.88), leg II: 16.46 (4.64 + 0.38 + 3.92 + 5.83+ 1.69), leg III: 11.49 (3.43 + 0.37 + 2.67 + 3.96 + 1.06), leg IV: 15.70 (4.61 + 0.38 + 3.62 + 6.03 + 1.06); tibia I L/d: 45; leg formula: I-II-IV-III. Distance PME-PME 0.16, diameter PME 0.13, distance PME-ALE 0.03, AME absent. Sternum slightly wider than long (0.74/0.62). Clypeus unmodified. Epigynum (Fig. 8A) slightly protruding. Vulva (Fig. 8B) with curved anterior arch and pair of medially constrictive, long pore plates.
Variation: Tibia I in male paratypes (IZCAS-Ar39740): 4.95. Tibia I in another female paratypes (IZCAS- Ar39742): 6.10.
Natural history. The species was found in the twilight zone of the Urai Thong Cave (karst area). Distribution. Known only from the type locality (Fig. 11).
description: Published as part of Lan, Tianqi, Yao, Zhiyuan, Zheng, Guo, Wongprom, Prasit & Li, Shuqiang, 2020, Five new species of the spider genus Savarna Huber, 2005 (Araneae: Pholcidae) from Thailand, pp. 311-328 in Zootaxa 4778 (2) on pages 321-324, DOI: 10.11646/zootaxa.4778.2.4, http://zenodo.org/record/3856586