Marine mollusks are a group of invertebrates that live in the ocean and include clams (4 letters), mussels (6 letters), ABALONE (7 letters), oysters (6 letters), cockles (6 letters), whelks (5 letters), seaslugs (7 letters) and sealemon (8 letters). These animals have a soft body and a hard shell, and they feed on plankton and other small organisms. They are an important part of the marine ecosystem, providing food for many species of fish and birds.