Littorinidae

Example:Mollusks, including sea snails, contribute to the biodiversity of marine ecosystems.

Definition:A soft-bodied invertebrate animal of the phylum Mollusca, such as a snail or clam. Though not specific to Littorinidae, the term is used in a broader sense to describe similar organisms.

Example:Gastropods are an ancient and diverse group of marine gastropods, including periwinkles.

Definition:A member of the large class Gastropoda of mollusks, characterized by a large muscular foot and an often whelk-like shell. This term is also more general than Littorinidae.