Class Lamellibranchia is a group of bivalve mollusks, commonly known as clams, oysters, mussels, and scallops. This class is characterized by two hinged shells that protect the soft body within. Synonyms for this class include Bivalvia and Pelecypoda. The name Bivalvia implies the presence of two valves or shells, while Pelecypoda defines the animals' method of feeding by using their two shells as jaws. Both Bivalvia and Pelecypoda are commonly used interchangeably with Lamellibranchia. The Lamellibranchia class contains more than 8,000 species of bivalves inhabiting freshwater, marine, and brackish water habitats worldwide. They play a crucial role in aquatic ecosystems as filter feeders, improving water quality, and as a food source for humans and other animals.