preoperculum Definition

suboperculum, preopercular, interoperculum, sphenotic, epibranchial, metapterygium, branchial arch, pharyngobranchial, pterotic, ceratobranchial, operculum, propterygium, hyostylic, metabranchial, hyomandibular, opercular, epipharyngeal, urohyal, cephalostyle, urostyle, omosternum, epicoracoid, basipterygium, gnathite, maxilliped, mesopterygium, epipterygoid, ossean, mentomeckelian, sphenethmoid, hypural, metasternum, petrohyoid, sphenoid bone, siphonium, parethmoid, precoracoid, membrane bone, opisthion, gnathopod, basisphenoid, basion, hypobranchial, spineback, epiotic, endaspidean, acanthion, flat bone, gnathopodite, pterygoquadrate, gnathic, lyrie, nasal bone, maxilloturbinal, exaspidean, actinost, parietal bone, surangular, frontal bone, supersphenoidal, presphenoid, protocercal, opisthotic, ichthyopterygium, paragnathus, xiphisternum, presternum, ethmoid bone, epimeron, saurognathous, craniate, sagittal suture, palatine bone, threadfish, holaspidean, basihyal, septomaxillary, platycoelian, ceratohyal, pectinibranchiate, subsphenoidal, obelion, wormian bone, tibiale, pectoral girdle, auriculated, stephanion, upper jawbone, mastoid process, articulary, omostegite, finlet, mandibulate, cysticule, parasphenoid, paragnathous, postclavicle, wingfish, epipodium, epipodite,