Survey of Linyphiidae (Arachnida: Araneae) spiders from Yunnan, China Author Irfan, Muhammad 0000-0003-0445-9612 College of Life Sciences, Hunan Normal University, Changsha, 410081, China Author Zhang, Zhi-Sheng 0000-0002-9304-1789 Key Laboratory of Eco-environments in Three Gorges Reservoir Region (Ministry of Education), School of Life Sciences, Southwest University, Chongqing 400715, China. Author Peng, Xian-Jin 0000-0002-2614-3910 College of Life Sciences, Hunan Normal University, Changsha, 410081, China text Megataxa 2022 2022-12-27 8 1 1 292 http://dx.doi.org/10.1094/PDIS-04-22-0755-PDN journal article 10.11646/megataxa.8.1.1 2703-3090 7526571 Ceratinella acutalum sp. nov. (ḰssẮƦ) Figures 58–60 Types. Holotype ♁, CHINA , Yunnan , Yongping County , near rice paddies, 25.36863°N , 98.54363°E , alt. 1620m , 9 October 1998 , Charles Griswold, D. H . Kavanaugh and Chun-lin Long leg. (98–YP). Etymology. This epithet derives from the Latin adjective “ acutalis ”, meaning “pointed” and refers to the pointed tip of the retrolateral tibial apophysis in the male palp. FIGURE 57. Distribution of Caviphantes species. Diagnosis. This new species resembles Ceratinella brevis ( Wider, 1834 ) in having the male cephalic lobe absent, but can be distinguished by the distal end of retrolateral tibial apophysis pointing towards the cymbium in C. acutalum sp. nov. ( Figs 58B, D , 59C ), whereas the distal part touches the proximal part of paracymbium in C. brevis (Cosar, 2021, figs 12–14); distally inner margin of embolus distally with a broad lobe in C. acutalum sp. nov. ( Fig. 58B ), whereas absent in C. brevis (Cosar, 2021, figs 12–14). Description. Male ( holotype , Fig. 59A, B ): Total length: 1.58. Carapace 0.71 long, 0.58 wide; cephalic region slightly elevated, brown; fovea, cervical and radial grooves distinct. Clypeus 0.14 high. Sternum wider than long, brown, sparsely covered with microsetae; labium wider than long; maxillae long, distal end broad with scopulae. Chelicerae with four promarginal and six retromarginal teeth. Eye region narrow, AER recurved, PER straight, slightly wider than AER. Eye sizes and interdistances: AME 0.04, ALE 0.06, PME 0.04, PLE 0.05, AME–AME 0.03, PME–PME 0.04, AME–ALE, 0.04, PME–PLE 0.06, AME–PME 0.04, ALE–ALE 0.27, PLE–PLE 0.31, ALE–PLE contiguous. Length of legs: I 2.05 (0.58, 0.71, 0.41, 0.35), II 1.81 (0.55, 0.60, 0.39, 0.27), III 1.52 (0.47, 0.47, 0.32, 0.26), IV 1.75 (0.59, 0.52, 0.36, 0.28). Leg formula I-II-IV-III. TmI and TmIV present. Tibial spine formula: 1-1-1-1. Abdomen 0.71 long, 0.58 wide, oval, gray, covered with fine hairs. Palp ( Figs 58A–D , 59C ): Tibia dorsally with broad, long apophysis, distal end slightly curved, sclerotized with pointed end; paracymbium U-shaped, distal tip slightly curved; subtegulum and tegulum highly sclerotized, protegulum vestigial; distal suprategular apophysis broad with blunt end, covered by the embolus and the tegulum. Embolic division: embolic membrane hidden on unexpended palp; tailpiece relatively long, sclerotized, slightly curved with blunt end, almost touches the basal margin of cymbium in ventral view. Embolus long, highly area, 27.16636°N , 98.77667°E , alt. 2563m , 4 May 2004 , Charles Griswold and D. H. Kavanaugh leg. ( CGY28 ) . FIGURE 58. Ceratinella acutalum sp. nov. , male palp of holotype. A prolateral view B retrolateral view C ventral view D dorsal view. FIGURE 59. Ceratinella acutalum sp. nov. , male holotype. A Habitus, dorsal view B Habitus, ventral view C Tibia, dorsal view. Distribution. China . Genus Collinsia O. Pickard-Cambridge, 1913 (ũH Ʀø)