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What is the role of the gizzard in an earthworm?
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The structure of polychaetes. (Left) Free-moving polychaetes. (A) Neanthes, (B) Nereis. (Right) Tube-dwelling (sedentary) polychaetes. (C) Amphitrite, (D) Sabella.
In earthworms, the gizzard is a specialized, muscular organ located along the digestive tract, following the pharynx and esophagus.1
Because earthworms ingest large quantities of soil, sand, and organic matter while feeding, the gizzard serves a critical mechanical function: it grinds these materials down to facilitate digestion. In this capacity, the gizzard acts similarly to the teeth of other animals, breaking down food particles before they pass into the intestine for further processing and nutrient absorption.231