Some 240-million-year-old ancient coelacanths utilized an ossified lung as a specialized sensory organ to detect and process underwater sound.
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https://www.sflorg.com/2026/03/pal03262601.html
Prehistoric fish: coelacanths heard underwater using their lungs

A study by UNIGE and MHNG shows that 240-million-year-old coelacanths could hear underwater using an ossified lung.