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The onion nerite snail eats using a specialized tongue-like organ called a radula covered in thousands of microscopic, hard teeth. It moves this ribbon-like structure back and forth in a rasping motion to scrape biofilm, soft microalgae, and detritus off hard surfaces like glass and rocks. [1, 2, 3, 4]
Mouth Parts and Function
Radula: A flexible, ribbon-like tongue embedded with rows of tiny teeth that act like a conveyor belt or file.
Odontophore: A cartilage-like cushion under the radula that supports and moves the ribbon forward and backward during feeding.
Jaw: A small, chitinous upper structure situated at the entrance of the mouth that helps chop or clip larger pieces of food before the radula rasps them down.
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