part of start stage end stage olfactory region dermatocranium supraethmoid TAO:0001403 supra-ethmoid ZFA:0001403 Dermal bone that first appears as paired ossifications in the membrane (dermis) dorsolateral to the ethmoid cartilage and anteriolateral to the lateral ethmoids, later having the appearance of one butterfly-shaped element. Fused to the anterodorsal margin of the mesethmoid. Bordered anteriorly by the kinethmoid and posteriorly by the frontal. zebrafish_anatomy dermal bone larval:days 21-29 adult