Falcidens - AbsoluteAstronomy.com

Falcidens is one of three genera within the Falcidentidae; its radula consists of a single row of teeth which are mineralized in crystaline hydroxyapatite (a most unusual mineral in organisms), and its teeth are not periodically shed and replaced like in other molluscs.
For details of the radula, see Radula#In caudofoveates.

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