Figure 7.

Progress of mineralization in “ring” and caudal fin centra. Mineralization expansion is represented by the arrows, in (a) a “ring” centrum that expands in linear mineralization fronts in the antero-posterior axis and (b) in caudal fin centrum, directly associated with the haemal cartilaginous arch (ca) attached to the notochord sheath, expanding from a basiventral origin. In black is represented the area of initial mineralization, which matches the myoseptum (Myo) in the case of a “ring” centrum.