Saltwater mollusks are a diverse group of marine animals that belong to the phylum Mollusca. They include species such as clams, oysters, and octopuses. These creatures typically have soft bodies, often protected by a hard shell made of calcium carbonate. Saltwater mollusks play important roles in their ecosystems, serving as both predators and prey. Many saltwater mollusks are also economically significant. For example, oysters and clams are harvested for food, while pearls produced by some species are valued in jewelry. Additionally, they contribute to water filtration and habitat formation in coastal environments.