18 Margarites helicinus. Rachidian and lateral teeth in two rows of radular teeth. Murman coast, northern Russia. Scanning electron microscope image frame 0.33mm wide. © I. Nekhaev.

18 Margarites helicinus. Rachidian and lateral teeth in two rows of radular teeth. Murman coast, northern Russia. Scanning electron microscope image frame 0.33mm wide.  © I. Nekhaev.

In each row of teeth, the central rachidian (1) is flanked on each side by six laterals. Their broad scooped stems (2) act as a conveyor belt to carry the food gathered by the bristle-like, marginal teeth (3) to the oesophagus.

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