http://en.wikipedia.org/wiki/Mouth
Many molluscs have a radula which is used to scrape microscopic particles off surfaces.In invertebrates with hard exoskeletons, various mouthparts may be involved in feeding behaviour. Insects have a range of mouthparts suited to their mode of feeding. These include mandibles, maxillae and labium and can be modified into suitable appendages for chewing, cutting, piercing, sponging and sucking.Decapods have six pairs of mouth appendages, one pair of mandibles, two pairs of maxillae and three of maxillipeds.Sea urchins have a set of five sharp calcareous plates which are used as jaws and are known as Aristotle's lantern.
Many molluscs have a radula which is used to scrape microscopic particles off surfaces.In invertebrates with hard exoskeletons, various mouthparts may be involved in feeding behaviour. Insects have a range of mouthparts suited to their mode of feeding. These include mandibles, maxillae and labium and can be modified into suitable appendages for chewing, cutting, piercing, sponging and sucking.Decapods have six pairs of mouth appendages, one pair of mandibles, two pairs of maxillae and three of maxillipeds.Sea urchins have a set of five sharp calcareous plates which are used as jaws and are known as Aristotle's lantern.
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