part of start stage end stage pectoral girdle postcleithrum zebrafish_anatomy TAO:0000410 postcleithra ZFA:0000410 Dermal bone that is part of the pectoral girdle and located ventral to the supracleithrum and posterior to the cleithrum. Postcleithral bones are paired and can vary up in number from a single pair (such as in zebrafish) to three pairs in other teleosts. dermal bone unknown adult