Definition
The *family Arcidae* consists of bivalve mollusks known as ark clams. They possess sturdy, often rectangular shells with a distinctive hinge featuring a row of teeth. These clams are found in various marine habitats globally. π Many attach to rocks or burrow in sediment. They are typically filter feeders, extracting nutrients from the water. Think of them as the 'old guard' of the clam worldβstrong and resilient.