@article{oai:aue.repo.nii.ac.jp:00008255,
 author = {Iwamatsu  Takashi},
 journal = {愛知教育大学研究報告. 自然科学編},
 month = {Mar},
 note = {text, The present report is to describe the morphological changes in developing pharyngeal bones with teeth in the period of metamorphosis in the medaka, Oryzias latipes and to contribute toward providing anatomical data of the medaka as an excellent model for taxonomic and evolutionary analysis. The developmental process of the tooth ridges and the skeletal elements was morphometrically examined in metamorphic phases from the larval to the juvenile. When fry hatch, the lower (fifth ceratobranchials, Cb5) and upper (third pharyngobranchials, Pb3) pharyngeal bones that are closely apposed are already observable. The size of the Cb5 and Pb3 bones increases progrssively in parallel with ossification in proportion to body growth. Shortly after hatching, the teeth in these pharyngeal bones already erupt on the ossified thin toothplate. The first tooth ridge with 6-7 teeth of the primary toothplate in these pharyngeal bones forms in larvae about 5.0 mm total length (TL). The tip of each conical tooth is posteriorly curved. When larvae grow 7.1 mm TL, second pharyngobranchials (Pb2) apposing to the anterior region of Pb3 can be detected. Newly erupting teeth in the posterior side of the preexisting tooth row can be detected in the upper and lower pharyngeal bones. The number of tooth ridges on the Pb3 toothplate increases linearly until 10 mm TL in proportion to body size but thereafter adds gradually. The present anatomical study appears to indicate that pharyngeal bones become nearly complete by about 15 mm TL.},
 pages = {75--81},
 title = {Growth of the Medaka (VIII) － Develpoment of Pharyngeal Bones with Teeth during Metamorphosis.},
 volume = {71},
 year = {2022}
}