Ischnothyreus yueluensis Yin & Wang, 1984, male (SYNU-450), light (A–C) and SEM (D–L) 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. left palp, dorsal view; G. palpal bulb, prolateral view; H. palpal bulb, retrolateral view; I. distal part of palpal bulb, dorsal view; J. distal part of palpal bulb, prolateral view; K. distal part of palpal bulb, retrolateral view; L. left chelicerae, posterior view. Abbreviations: dlm = dorsal leaf-shaped membrane, pl = prolateral lobe, plm = prolateral leaf-shaped membrane, rl = retrolateral lobe, sp = stick-shaped sclerotised process, vp = ventral projection, vpr = ventral protuberances. Scale bars: 0.1 (A–F), 0.05 (G, H) and 0.02 (I–L).