19 Margarites helicinus. Marginal radular teeth. Murman coast, northern Russia. Scanning electron microscope image frame 0.19mm wide. © I. Nekhaev.

19 Margarites helicinus. Marginal radular teeth. Murman coast, northern Russia. Scanning electron microscope image frame 0.19mm wide.  © I. Nekhaev.

Numerous, closely packed, long bristle-like marginals are outermost in each row of teeth. When operated, they fan out and act as a brush and as a sieve to retain fine particles of food and let water escape.

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