accessory olfactory sac
olfactory ventilation sac (an extension of the olfactory cavity, often characteristic of inactive bottom dwellers living in still water such as flatfishes, dipnoans, and eels but also found in clupeids, salmonids, mugilids and scombrids. Primarily used for ventilation but also produce mucus. There may be up to four sacs, usually the additional sacs are smaller but in Osmeridae the sole accessory sac is larger than the main sac)

Dictionary of ichthyology. 2009.

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