part of start stage end stage centrum ZFA:0000126 TAO:0000126 Centra are represented by mineralized, calcified, or ossified portions that surround the notochord. The autocentrum, present in Danio and all other living teleosts, is formed by direct ossification outside the elastica externa of the notochord (Arratia, 1999). autocentrum zebrafish_anatomy vertebra endochondral bone larval:protruding-mouth adult