According to Barne Gat Shellfish:

When not feeding the radula is retracted into this chamber which protects the mouth from the sharp teeth of the radula.

Does the radula sac serve any other purpose?

  • $\begingroup$ Do you have any reason to believe it does? $\endgroup$ Dec 31 '20 at 22:10
  • $\begingroup$ @theforestecologist no particular reason. I just thought if the sac can be protected from the teeth, why only that and not the rest of the mouth? $\endgroup$ Dec 31 '20 at 22:37

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