A review of the Ptocasius Simon, 1885 spiders of Gaoligong Mountains, China (Araneae: Salticidae) Author Yang, Su-Fang 623A01EA-41AD-41AB-8CAD-EEFDB651F1DA Key Laboratory of Chemical Biology & Traditional Chinese Medicine Research (Ministry of Education), College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha, Hunan 410081, China. yangsu03-11@163.com Author Peng, Xian-Jin 87E11EB5-D918-4E67-841E-B291C651FE72 College of Life Sciences, Hunan Normal University, Changsha, Hunan 410081, China. xjpeng@126.com text European Journal of Taxonomy 2023 2023-11-07 903 1 1 61 https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/2321/10085 journal article 10.5852/ejt.2023.903.2321 2118-9773 10119638 036AB8E1-669E-499B-8CA7-141509A11F2C Ptocasius circulus sp. nov. urn:lsid:zoobank.org:act: 56D8C9A4-03B4-4646-80DC-49E5A3D730A2 Figs 3–4 , 42 Diagnosis The new species resembles P. strupifer Simon, 1901 ( Peng 2020 : fig. 275f) in having the similar outline of copulatory openings and the position of pockets, but can be distinguished by: spermathecae relatively well folded, complicated in dorsal view ( Figs 3C , 4B ), while globular in P. strupifer ( Peng 2020 : fig. 275g ). Etymology The specific name is derived from the Latin noun ‘ circulus ’ (‘circle’) in apposition, referring to the circular outline of the atrium. Type material Holotype CHINA • ♀ ; Yunnan Province , Nujiang Prefecture , Gongshan County , Nujiang State Nature Reserve , Qiqi , 9.9 km West of Gongshan ; 27°42′55″ N , 98°33′55″ E ; 2000 m a.s.l. ; 9–14 Jul. 2000 ; Heng-mei Yan , David Kavanaugh , Charles Griswold , Hong-bin Liang , Darrell Ubick and Da-zhi Dong leg.; HNU-00–QF–1. Paratype ( 1 ♀ ) CHINA – Yunnan Province • 1 ♀ ; Nujiang Prefecture , Gongshan County , Danzhu , 13.5 km Southwest of Gongshan ; 27°37′50″ N , 98°37′14″ E ; 2700 m a.s.l. ; 30 Jun.–5 Jul. 2000 ; David Kavanaugh , Charles Griswold , Hong-bin Liang , Darrell Ubick , Heng-mei Yan and Da-zhi Dong leg.; HNU-00–GD–1 . Description Female ( holotype ) BODY AND HEAD . Total length 6.00. Prosoma 2.50 long, 1.85 wide. Opisthosoma 3.50 long, 2.20 wide. Clypeus height 0.10. Carapace ( Fig. 3A ) light brown; carapace margin and eye base black; ocular area dark brown, lateral margins black sparsely with long brown hairs. Fovea reddish brown, cervical and radial groove black, distinct. Eye diameter and interdistances: AME 0.53, ALE 0.30, PLE 0.30, AERW 1.70, PERW 1.65, EL 1.10. Sternum scutiform, covered with short brown hairs; the median area slightly bulged, yellowish brown, with dark brown margin. Clypeus dark brown, between sides and AMEs with three clusters long dark brown hairs; promargin with row of long hairs. Endites and labium brown, distal area light brown, covered with grayish black hairs. Fig. 3. Ptocasius circulus sp. nov. , holotype, ♀ (HNU-00–QF–1). A . Body, dorsal view. B . Epigynum, ventral view. C . Vulva, dorsal view. Scale bars: A = 0.5 mm; B–C = 0.1 mm. CHELICERAE ( Fig. 4C ). Dark brown, distal area covered with long brown hairs, two promarginal teeth and one retromarginal denticle. LEGS . Grayish black with black annuli, densely covered with grayish black hairs, bearing long and strong spines. Tibiae I and II with three pairs of long ventral spines, metatarsi I and II with two pairs of long ventral spines. LEG MEASUREMENTS . I = 4.35 (1.35, 1.70, 0.70, 0.60), II = 4.00 (1.30, 1.50, 0.60, 0.60), III = 4.80 (1.45, 1.70, 0.90, 0.75), IV = 5.35 (1.60, 1.85, 1.20, 0.70). Leg formula: IV–III–I–II. ABDOMEN ( Fig. 3A ). Oval, dorsum long oval, light yellow, each side with a wide grayish black longitudinal band, the marginal area with a light incision; the posterior portion with five light markings, mid-dorsally with two pairs of sigillae; ventral light yellow, the median area with a grayish black longitudinal band, sides with irregular grayish black markings and twills. Spinnerets dark brown. EPIGYNUM ( Figs 3B–C , 4A–B ).Almost as long as wide; the pockets triangular, almost touching copulatory openings; epigynum with a transverse W-shaped band between connecting the bases of copulatory openings; atrium outline almost circular; spermathecae folded, much complicated. Male Unknown. Distribution China ( Yunnan Province , Fig. 42 ).