Many popular aquarium fish such as goldfish and loaches have these structures. Members of the Botia genus such as clown loaches are known to make distinctive clicking sounds when they grind their pharyngeal teeth. Grunts (family Haemulidae) are so called because of the sound they make when they grind them.Molas are said to be able to produce sound by grinding their long, claw-like pharyngeal teeth.
^Park JK, Rho HS, Kristensen RM, Kim W, Giribet G (Nov 2006). "First Molecular Data on the Phylum Loricifera – An Investigation into the Phylogeny of Ecdysozoa with Emphasis on the Positions of Loricifera and Priapulida". Zoolog Sci.23 (11): 943–54. doi:10.2108/zsj.23.943. PMID17189906.