part of overlaps start stage end stage preopercle dermal bone preopercle vertical limb TAO:0000336 preopercle posterior arm A dermal bone that is the upper, vertical portion of the preopercle bone. zebrafish_anatomy preopercle dorsal arm ZFA:0001595 preopercle vertical arm preopercle upper limb preopercle vertical limb-hyomandibula joint unknown adult