Pholcus umphang Yao & Li sp. nov.

FIGS 3–5

Type material. Holotype: MAlE, HUAI LAO POO CAVE (15°57.680'N, 98°52.510'E, ElEVATION 534 M), UMPHANG SUBDISTRICT, UMPHANG DISTRICT, Tak, Thailand, 16 NOVEMBER 2016, H. ZHAO, Y. LI AND Z. CHEN lEG . Paratypes: 3 FEMAlES, SAME DATA AS HOlOTYPE .

Etymology. THE SPECIFIC NAME REFERS TO THE TYPE lOCAlITY, AND IS A NOUN IN APPOSITION.

Diagnosis. THIS SPECIES CAN BE EASIlY DISTINGUISHED FROM All KNOWN CONGENERS IN THE P. halabala SPECIES-GROUP BY THE PRESENCE OF A SMAll, SClEROTIZED, SERRATED RETROlATERO-VENTRAl APOPHYSIS SUBDISTAllY ON THE PROCURSUS (ARROW 1 IN FIG. 3B; FIG. 3D) AND BY THE PRESENCE OF TWO lARGE VENTRAl SClERITES ON THE VUlVA (ARROW 2 IN FIG. 5B).

Description. Male (holotype): TOTAl lENGTH 4.36 (4.49 WITH ClYPEUS), CARAPACE 1.20 lONG, 1.28 WIDE, OPISTHOSOMA 3.16 lONG, 1.13 WIDE. LEG I MISSING, lEG II: – (8.08 + 0.56 + 7.50 + 13.39 + –), lEG III: 19.02 (5.45 + 0.50 + 4.55 + 7.69 + 0.83), lEG IV: 26.18 (7.56 + 0.52 + 6.15 + 10.71 + 1.24). DISTANCE PME-PME 0.40; DIAMETER PME 0.11; DISTANCE PME-ALE 0.02; DISTANCE AME-AME 0.04; DIAMETER AME 0.06. STERNUM WIDER THAN lONG (0.84/0.63). HABITUS AS IN FIGS 4D–E. CARAPACE YEllOWISH, WITH BROWN V-PATTERN ON POSTERIOR HAlF; OCUlAR AREA YEllOWISH; ClYPEUS YEllOWISH, WITH BROWN MARKS POSTERIORlY; STERNUM YEllOWISH, WITH BROWN MARKS. LEGS YEllOWISH, BUT DARK BROWN ON PATEllAE, PROXIMAl PARTS OF TIBIAE, AND DISTAl PARTS OF FEMORA AND TIBIAE, WITHOUT DARKER RINGS. OPISTHOSOMA YEllOWISH, WITH SPOTS DORSAllY AND lATERAllY. OCUlAR AREA ElEVATED; EACH EYE TRIAD ON TOP OF A lATERAllY DIRECTED EYE-STAlK. THORACIC FURROW ABSENT. CHElICERAE AS IN FIG. 4C, WITH A PAIR OF PROXIMO-lATERAl APOPHYSES AND A PAIR OF DISTAl APOPHYSES PROVIDED WITH TWO TEETH EACH. PEDIPAlPS AS IN FIGS 3A–B; TROCHANTER WITH A lONG VENTRAl APOPHYSIS; FEMUR WITH A SMAll DORSAl APOPHYSIS PROXIMAllY (ARROW IN FIG. 3A), SUBPROXIMAllY WIDENED; PROCURSUS SIMPlE PROXIMAllY BUT COMPlEX DISTAllY, WITH A SMAll, SClEROTIZED, SERRATED RETROlATERO-VENTRAl APOPHYSIS SUBDISTAllY (ARROW 1 IN FIG. 3B; FIG. 3D); BUlB WITH A lARGE PROJECTION PROXIMAllY (ARROW 2 IN FIG. 3B); UNCUS WITH SCAlES; APPENDIX ABSENT; EMBOlUS PARTlY SClEROTIZED. LEGS WITH SHORT VERTICAl SETAE ON TIBIAE, METATARSI AND TARSI, WITHOUT SPINES AND CURVED SETAE.

Female: SIMIlAR TO MAlE, HABITUS AS IN FIGS 5 D–E. TOTAl lENGTH 4.42 (4.55 WITH ClYPEUS), CARAPACE 1.23 lONG, 1.28 WIDE , OPISTHOSOMA 3.19 lONG, 1.38 WIDE; lEG I: 38.11 (9.36 + 0.55 + 9.17 + 17.63 + 1.40); TIBIA I L/D: 69. DISTANCE PME-PME 0.25; DIAMETER PME 0.13; DISTANCE PME-ALE 0.03; DISTANCE AME-AME 0.05; DIAMETER AME 0.05. STERNUM WIDER THAN lONG (0.89/0.78). OCUlAR AREA WITHOUT EYE-STAlKS. EPIGYNUM (FIGS 5A–B) WITH A KNOB (ARROW IN FIG. 5A). VUlVA (FIG. 5C) WITH A SClEROTIZED ANTERIOR ARCH PROVIDED WITH VENTRAl RIDGES (ARROW 1 IN FIG. 5B), TWO lARGE VENTRAl SClERITES (ARROW 2 IN FIG. 5B), AND TWO NEARlY EllIPTIC PORE PlATES. RETROlATERAl TRICHOBOTHRIUM OF TIBIA I AT 8% PROXIMAllY; TARSUS I WITH 33 DISTINCT PSEUDOSEGMENTS.

Variation: TIBIA I IN THE OTHER TWO FEMAlE PARATYPES: 8.27, 8.85.

Distribution. THAIlAND (TAK, TYPE lOCAlITY; FIG. 12).

Natural history. THE SPECIES WAS FOUND IN THE ENTRANCE ZONE OF THE CAVE.