Trilacuna songyuaesp. n., male. A abdomen, ventral view B abdomen, lateral view C left palp, prolateral view D left palp, retrolateral view E chelicerae, oblique, anterior view F left leg IV, prolateral view. Abbreviations: boc = booklung covers; dd = dark dot; ehb = elevated hair base; nls = numerous, long setae; sp = sperm pore; sps = spear-like setae; tss = two long, strong setae. Scale bars: 0.1 mm (A–D).