FIGURE 11 in Deep-sea serpulids (Annelida: Polychaeta) in tetragonal tubes: on a tube convergence path from the Mesozoic to Recent

FIGURE 11. Tube ultrastructures of Hyalopomatus dieteri sp. nov. A–E: PIN 5485/16, A—longitudinal wall section with parabolic texture in middle wall part, B—enlarged outer part consisting of larger slightly elongated and isometric crystals, Cenlarged middle wall part, parabolic texture produced by orientation of elongated crystals along growth lines, D—enlarged inner wall part showing slight transition to isometric smaller crystals, E—oblique longitudinal section through inner wall part showing orientation of crystals transversely to growth axis, F—tube cross-section, G—enlarged cross-section across tube edge, H—enlarged outer wall part, I—details of middle wall part consisting of isometric to slightly elongated crystals in tube edge area, J—details of inner wall part showing layer with ordered cigar-shaped crystals. Arrows indicate direction of tube growth (where known). Abbreviations: g. l.—growth lamellae, o. s.—outer tube surface.