Figure 3. A–B in Ultrastructure and mineral composition of serpulid tubes (Polychaeta, Annelida)

Figure 3. A–B, Neovermilia falcigera, irregularly oriented platy structure, outer tube layer. A, cross section. B, longitudinal section. C–D, Bathyvermilia langerhansi, homogeneous angular crystal structure, outer tube layer. C, cross section. D, longitudinal section. E–F, Pomatostegus stellatus, homogeneous rounded crystal structure. E, cross section. F, longitudinal section. All samples were polished and treated with 1% acetic acid for 2 min. Abbreviations: exter, exterior.