A review of Crassignatha (Araneae, Symphytognathidae) Author Li, Ya Key Laboratory of Bio-resources and Eco-environment (Ministry of Education), College of Life Sciences, Sichuan University, Chengdu, Sichuan 610064, China & The Sichuan Key Laboratory for Conservation Biology of Endangered Wildlife, Sichuan University, Chengdu, Sichuan 610064, China https://orcid.org/0000-0002-9558-4154 Author Lin, Yucheng Key Laboratory of Bio-resources and Eco-environment (Ministry of Education), College of Life Sciences, Sichuan University, Chengdu, Sichuan 610064, China & The Sichuan Key Laboratory for Conservation Biology of Endangered Wildlife, Sichuan University, Chengdu, Sichuan 610064, China linyucheng@scu.edu.cn Author Li, Shuqiang Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, China https://orcid.org/0000-0002-3290-5416 lisq@ioz.ac.cn text ZooKeys 2020 988 63 128 http://dx.doi.org/10.3897/zookeys.988.56188 journal article http://dx.doi.org/10.3897/zookeys.988.56188 1313-2970-988-63 6E64D69BDD734A7EAE2B3CD21247A5E3 D5BC323AA5F05894AE8FBB10A3F0960D Crassignatha xichou Y. Lin & S. Li sp. nov. Figs 33 , 38 Type material. Holotype ♀ (NHMSU Ar 130), China : Yunnan Province, Wenshan Prefecture, Xichou County, near to radio and television transmitting tower, in leaf litter ( 23.43302°N , 104.67320°E ; 1556 m), 17.V.2015, Z. Chen and Y. Li leg.; paratype 1♀ (NHMSU Ar 131), China : Yunnan Province, Nanjian County, Xiaowan Township, Huilongshan Village, near to entrance of Banpoyan Cave, in bushes ( 24.93353°N , 100.31443°E ; 1990 m), 23.VIII.2018, Y. Lin et al. leg. Diagnosis. This new species can be easily distinguished from all species of Crassignatha by the lack of a scape, the fertilization ducts starting at the posterolateral margin of the spermathecae, the copulatory ducts connecting to the anterolateral margin of spermathecae, fusing into an H-shaped atrium above copulatory opening (Fig. 33E, F ). Figure 33. Female of Crassignatha xichou sp. nov. A habitus, dorsal B habitus, ventral C habitus, lateral D epigyne, ventral E vulva, ventral F vulva, dorsal. Scale bars: 0.50 mm ( A-C ); 0.10 mm ( D-F ). Description. Female (holotype). Total length 0.60. Carapace 0.24 long, 0.28 wide, 0.24 high. Clypeus 0.06 high. Sternum 0.16 long, 0.16 wide. Abdomen 0.44 long, 0.40 wide, 0.48 high. Length of legs: I 0.88 (0.24, 0.10, 0.20, 0.14, 0.20); II 0.78 (0.20, 0.10, 0.18, 0.12, 0.18); III 0.64 (0.14, 0.10, 0.14, 0.10, 0.16); IV 0.74 (0.20, 0.10, 0.16, 0.10, 0.18). Somatic characters (Fig. 33A-C ). Coloration : carapace dark brownish, darker in thoracic center and margins. Mouthparts and sternum dark. Abdomen dark grayish. Prosoma : carapace nearly pear shaped, surface indistinctly textured. Cephalic part raised. ALE slightly protruded. PER straight. Chelicerae lighter than endites and labium, bears short setae anteriorly. Labium nearly semicircular. Sternum scutiform, slightly swollen, surface pitted, truncated posteriorly. Legs : metatarsi and tarsi yellow-brown, tibiae and femora dark. Abdomen : oval dorsally, with light brown sclerotized dots. Spinnerets tiny. Epigyne (Fig. 33D-F ): epigynal area dark, slightly sclerotized, with sparse, short setae. Scape absent. Internal structures faintly visible via translucent tegument. Paired spermathecae small, globose, separated by their diameter. Fertilization ducts originating posteromedially from spermathecae, coiled below spermathecae. Copulatory ducts long, connected to outer lateral margin of spermathecae, making four turns before merging into an H-shaped atrium. Male. Unknown. Etymology. The specific name is derived from the type locality; noun in apposition. Distribution. China (Yunnan) (Fig. 38 ).