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Related to ceratohyal: Hyomandibular


Relating to one of the cornua of the hyoid bone.
Synonym(s): keratohyal
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Anterior ceratohyal ventral surface giving origin to two anteriormost small branchiostegal rays, then two large rays rising from anterior ceratohyal lateral surface.
QC3, quantification code 3, identified to family: basi-branchial, basioccipital, basipterygium, ceratohyal, coracoid, ethmoid, ectopterygoid, epihyal, exoccipital, frontal, hyomandibular, interhyal, interopercular, lacrimal, lower hypohyal, opercular, opisthotic, otolith, palatine, prefrontal,' preopercular, prootic, pterotic, supracleithrum, scapula, supraoccipital, sphenotic, symplectic, urohyal, upper hypohyal.
3); one pair of slender uroneurals; three epurals; a free parhypural; three thin supraneurals, generally straight; two supernumerary spines on first dorsal pterygiophore; no procumbent spines (spurs); thin Y-shaped basisphenoid, free from parasphenoid and prootics; neurocranium with frontal tabs similar to Vincentia Castelnau, 1872 (Fraser 1972: pl 31); supramaxilla absent; posttemporal smooth or with 1-3 small serrae on posterior margin; preopercle with 2-3 small, widely spaced serrae near angle, ridge smooth; infraorbitals smooth; infraorbital shelf present on third bone; ring of scleral cartilage, no ossification present; 7 branchiostegals; ceratohyal notched, suture smooth with epihyal; urohyal with short anterior process.
Ceratohyal and epihyal cartilages continually expand until 9 DPH when the hyoid reaches its maximum depth and has the full complement of six branchiostegal rays.