diverticulum
A pouch or sac branching from a hollow organ or structure, such as the alimentary canal.
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Ichthyological terms, not general ones.
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epibranchial organ
Present in some microphagous fishes and comprises a paired dorsal diverticulum located towards the posterior of the pharynx. In the majority of species it's divided into two sections by additional gill rakers which trap small food particles.