External and internal views of Scolanthus isei sp. n. (NSMT-Co 1611). A, B External view A whole preserved specimen of S. isei B view of tentacular circle of living specimen C–J internal view (histological section) C longitudinal section of tentacle D transverse section of tentacle E longitudinal section of oral end F transverse section of actinopharynx (half of body) G enlarged view of mesentery H enlarged view of gonad. Several matured oocytes contained I densely distributed nemathybomes J enlarged view of transverse section of nemathybome. Abbreviations: a, actinopharynx; Ne, nemathybome; Oo, oocyte; Ov, ovary; pm, parietal muscle; rm, retractor muscle; Te, tentacle; TP, trichome-like structure on periderm. Scale bars: 5 mm (A, B); 500 µm (E, F, G, I); 100 µm(C, D, H, J).