The genus Jacaena Thorell, 1897 from southern China (Araneae: Liocranidae) Author Mu, Yannan 0000-0002-2504-673X The Key Laboratory of Invertebrate Systematics and Application, Institute of Life Science and Green Development, Hebei University, Baoding, Hebei 071002, P. R. China & 15188605531 @ 163. com; https: // orcid. org / 0000 - 0002 - 2504 - 673 X Author Zhang, Feng 0000-0002-3347-1031 The Key Laboratory of Invertebrate Systematics and Application, Institute of Life Science and Green Development, Hebei University, Baoding, Hebei 071002, P. R. China text Zootaxa 2020 2020-07-23 4819 2 335 348 journal article 8961 10.11646/zootaxa.4819.2.6 2315fd5b-b9f0-4c78-956c-8c9ee7a8d35b 1175-5326 4440608 41C762ED-B83A-41A2-B769-22CF58B38977 Jacaena menglaensis sp. n. (ŧĸ×ƚ,) Figs 1H , 2C , 5 D–E Type material. Holotype ♂ , CHINA , Yunnan Province , Dai Autonomous Prefecture of Xishuangbanna , Mengla County , Menglun Town , Xishuangnanna Tropical Botanical Garden of ChineseAcademy of Sciences( 21°54’36.41’’N , 101°16’11.17’’E ), 526 m a.s.l. , 12 July 2018 , leg. Chi Jin. Etymology. The species name is a noun in apposition, derived from the type locality. Diagnosis. This new species is similar to J. aspera sp. n. , but can be distinguished by: 1) the thin and smooth tegular apophysis ( vs thicker and rough); 2) the salient dRTA ( vs small). Description. Male ( Holotype ). Total body length 6.06: carapace 3.21 long, 2.49 wide; abdomen 2.85 long, 1.73 wide. Carapace oval, deep black brown, with radial granulated integument; fovea deep and round. Eye sizes and interdistances: AME 0.12, ALE 0.14, PME 0.12, PLE 0.12; AME–AME 0.11, AME–ALE 0.08, PME–PME 0.12, PME–PLE 0.20, ALE–PLE 0.20; MOA 0.33 long, anterior width slowly short than posterior width (0.33: 0.42). Clypeal height 0.27, more than two times of the diameter of AME. Leg spination: femur I with 2 strong pl spines, other femora spineless; tibia I with 6 pv and 7 rv spines, tibia II with 6 pairs of ventral spines, tibia III with 3 pl and 2 rv spines, and 1 pl and 1 rl spines, tibia IV with 3 pv and 1 rv spines; metatarsus I with 4 pairs of ventral spines, metatarsus II with 4 pairs of ventral spines, metatarsus III with 1 pl, 1 rl and 1 rv spines, metatarsus IV with 1 pv, 2 rv, and 1 pl, 1 rl spines. Leg I 8.53 (2.36+0.99+2.23+1.85+1.10), Leg II 7.51 (2.17+0.95+1.83+1.53+1.03), Leg III 6.63 (1.82+0.88+1.37+1.60+0.96), Leg IV 9.56 (2.48+0.98+2.13+2.57+1.40). Leg formula: 4123. Other characters see J. aspera sp. n. , except for different coloration. Abdomen oval and dark gray, with small dorsal scutum and pair of muscular impressions centrally. Palp as illustrated ( Fig. 5 D–E). Tibia short, dark brown, RTA with two processes, dRTA triangular, strongly sclerotized, tip milky; pRTA short and sclerotized. Tegulum yellow-brown, reniform, with faint sperm duct and long, spiral and cuspidal tegular apophysis; subtegulum thin. Embolus thin, strongly coiled, tip along with tegular apophysis. Conductor membranous, behind embolus. Female: unknown. Comment : This new species and one of the paratypes of another new species ( J. aspera sp. n. ) were both collected from same location (Xishuangbanna Tropical Botanical Garden of the Chinese Academy of Sciences). However, the distribution range of J. aspera sp. n. is larger than J. menglaensis sp. n. . Distribution. China ( Fig. 9 , Yunnan Province ).