develops from start stage end stage basibranchial copula 1 basibranchial 3 zebrafish_anatomy TAO:0001225 Basibranchial 3 ossifies in copula 1 posterior to the second hypobranchials, anterior to the third hypobranchials (7.6 mm) and associated with pharyngeal arch 5. Cartilage pads, remnants of copula 1, remain between adjacent basibranchials in the adult. ZFA:0001225 larval:days 14-20 adult