👉 Redworms are an order of gastropod mollusks that belong to the family Arctica, which also includes the common snail and the oyster. They have a hard outer shell made up of exoskeletons and a thin, muscular mantle. Redworms are characterized by their distinctive red coloration, which is caused by an enzyme called ferruginolipase. Redworms feed on small invertebrates such as crabs, shrimp, and snails.