develops from
develops from
existence starts during or after
start stage
basibranchial
copula 2
basibranchial 4
TAO:0001226
Occasionally, a fourth basibranchial ossifies in the narrow copula 2 cartilage, which lies posterior to the third basibranchial and anterior to the anteromedial articulation of the fifth ceratobranchials.
zebrafish_anatomy
ZFA:0001226
larval:days 21-29