System Glossary
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Definition of Term

(English) The large bone which forms the upper posterior part of the operculum; often bears one to three backward-directed spines in the higher fishes; usually the largest of the thin bones forming the gill cover in bony fishes. Sometimes used in aging studies. (See also: operculum, bony fishes, gill)
(French) Grand os qui forme la partie postéro-supérieure de l'opercule ; porte souvent un à trois épines dirigées vers l'arrière chez les poissons les plus évolués ; le plus grand des os minces qui forment l'opercule des poissons osseux. (See also: operculum, bony fishes, gill)
(Portuguese) Osso grande que forma a parte postero-superior do opérculo; frequentemente possui de um a três espinhos dirigidos para trás. (See also: operculum, bony fishes, gill)

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