Weberian apparatus

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What Wikipedia says

The Weberian apparatus is an anatomical structure that connects the swim bladder to the auditory system in fishes belonging to the superorder Ostariophysi. When it is fully developed in adult fish, the elements of the apparatus are sometimes collectively referred to as the Weberian ossicles or Weber's ossicles.

Excerpt from the Wikipedia article “Weberian apparatus”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: David Starr Jordan, Public domain, via Wikimedia Commons.