A conical structure of calcareous plates and muscles supporting the rasping teeth of a sea urchin.
- Many have a group of hard plates which retract and grasp like teeth, commonly called Aristotle's lantern.
- The mouth, in the peristomal membrane, contains a powerful chewing apparatus called the Aristotle's lantern.
- Organisms in and on the sand grains are manipulated towards the mouth along the food grooves, and then exposed and/or macerated by the crushing action of the Aristotle's lantern.
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