BASIBRANCHIAL
basibranchial: translation
one of the deep median bones at the base of the gill arches below the hypobranchials. May occur on arches 1, 2, 3, 4, the last being cartilaginous. The dermal plates bearing teeth and associated with the basibranchials are a separate structure. Each of the basibranchials may be called a copula and the first is named the basihyal