Author: LorentzLorentz Date: Oct 19, 2007 12:58
I know that sharks, batoids, and some bony fish have spiracles,
which are holes leading to the pharynx. They are supposed to be
homologous to our ear openings. In batoids (rays and skates), they are
used as an alternate route to the mouth for inspiration of water.
Are the spiracles actually used for hearing?
Most fish don't have spiracles, and they hear. Furthermore, I read
that fish don't need external ears because the sound passes easily
through their skin. The skin and body fluids are normally to impedance
matched with the water. However, I found a children's book on sharks
that claims the spiracles are used for hearing. I suppose they may
help, but I can't find any other reference to the use of spiracles in
hearing.
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