External and internal morphology of Edwardsianthus amethystus sp. nov. (CMNH-ZG 09763) A oral view of living specimen in the habitat B outer view of preserved specimen C longitudinal section of tentacle D transverse section of tentacle E transverse section of retractor muscle F transverse section of testis G transverse section of trace of nemathybome. Abbreviations: fi, filament; me, mesoglea; ne, nemathybome-like structure; pa, parietal muscle; rm, retractor muscle; scs, scapus; te, tentacle; tlm, tentacle longitudinal muscle; ts, testis. Scale bars: 1 cm (A, B); 500 µm (E, F); 100 µm (C, D, G).