The term TYPE OF MOLLUSK can be answered with two crossword solutions: SCALLOP (7 letters) and UNIVALVE (8 letters). Mollusks are a large phylum of invertebrate animals, including snails, clams, and octopuses. Scallops are a type of mollusk that have two shells connected by a hinge, and they are known for their ability to swim short distances. Univalves are a type of mollusk that have only one shell, such as snails and slugs.