Ischnothyreus yunlong sp. n., holotype male, light (A–C) and SEM (D–M) microphotographs A. left palp, prolateral view; B. left palp, dorsal view; C. left palp, retrolateral view; D. left palp, prolateral view; E. left palp, retrolateral view; F. distal part of palpal bulb, dorsal view; G. palpal bulb, prolateral view; H. palpal bulb, retrolateral view; I. left chelicerae, anterior view; J. distal part of palpal bulb, prolateral view; K. distal part of palpal bulb, retrolateral view; L. palpal bulb, dorsal view; M. left chelicerae, posterior view. Abbreviations: dp = dorsal protuberance, fp = flag-shaped process, rl = retrolateral lobe, ssp = small sclerotised process, ste = sharp, tooth-like extension, vp = ventral projection. Scale bars: 0.1 (A–E, G, H), 0.05 (I, L, M) and 0.02 (F, J, K).