The scientific name of this group, Sacoglossa, means "shield tongue." This group possesses a unique anatomical feature, a sack-like structure in the alimentary canal which retains discarded radular teeth. The radulae in this order are connected in a chain-like fashion and revolve into position for use. When worn, they are discarded into the sack. Sacoglossans are herbivorous, feeding only on marine algae, with the exception of three species which prey upon the eggs of other molluscs. The radula are used to puncture the cell wall of the food item, and once the wall is punctured, the animal can suck out the internal cellular material.