FIGURE 13 in Deep-sea serpulids (Annelida: Polychaeta) in tetragonal tubes: on a tube convergence path from the Mesozoic to Recent

FIGURE 13. Tube ultrastructures of Zibrovermilia zibrowii gen. et sp. nov. PIN 5485/17. A—longitudinal wall section, Benlarged outer part showing outer layer consisting of elongated crystals orientated perpendicular to outer surface, C—enlarged middle wall part consisting of small isometric crystals, D—enlarged inner wall part with smallest isometric crystals, E—tube cross-section, G—enlarged cross-section through edge showing separation of inner wall layer, dark area to the right is an artefact (cutting trace), F—another enlarged cross-section through edge, H—details of outer wall part with clearly visible outer layer, I—details of middle wall part, J—details of inner wall part showing layer consisting of smallest isometric crystals. Abbreviation: o. s. ‒ outer tube surface.