start stage end stage basidorsal TAO:0001060 zebrafish_anatomy arcualia Basidorsals are bilaterally paired cartilages on the dorsolateral side of the notochord which are replaced by ossified neural arches or dorsal arcocentra. In otophysan fishes, basidorsal 1, bd2, bd3, and bd4 give rise to parts of the Weberian apparatus. ZFA:0001060 postcranial axial cartilage unknown larval:days 7-13