Figure 1. A–B in Ultrastructure and mineral composition of serpulid tubes (Polychaeta, Annelida)

Figure 1. A–B, Apomatus globifer, irregularly oriented prismatic structure, polished and treated with GA (see Material & Methods) solution for 5 min. A, cross section. B, longitudinal section. C–E, Marifugia cavatica, polished, and treated with 1% acetic acid for 2 min. C, cross section, two-layered tube with irregularly oriented prismatic structure. D, longitudinal section, outer tube layer, with a low content of homogeneous carbonate cement. E, longitudinal section, inner tube layer, with a high content of homogeneous carbonate cement. F, Semivermilia crenata, irregularly oriented prismatic structure with a high content of homogeneous carbonate cement, polished cross section, treated with GA solution for 5 min. Abbreviations: cryst, crystals; exter, exterior; hc, homogeneous carbonate cement.