Image of internal morphology of Antipathozoanthus tubus sp. nov. (holotype: NSMT-Co 1742) a longitudinal section of polyp b closed-up image of cteniform endodermal marginal muscle c, d cross-section of polyp. Abbreviations: A: actinopharynx, MF: mesenterial filament, CEMM: cteniform endodermal marginal muscle, DD: dorsal directives, VD: ventral directives, S: siphonoglyph, 5th: 5th mesentery from dorsal directives, M: mesoglea, CM: complete mesentery, IM: incomplete mesentery. Scale bars: 0.5 mm (a, c), 0.1 mm (b, d).