👉 Crustacea, also known as bivalves or mollusks, are a class of marine animals that include oysters, clams, mussels, and many other types of shellfish. They have a distinct outer shell called a mantle, which is composed of two parts: the epibiont (a protective layer on the exterior) and the bivalve (the inner part of the shell). The bivalves are characterized by their unique reproductive organs - oophoras -
