Genus Arca refers to a group of marine bivalve mollusks commonly known as ark clams. Some synonyms used for the term Genus Arca include clam, Arcoida, ark shell, Arca, Paramphithalamus, Cucullaea, and Scapharca. These synonyms are often used interchangeably to refer to this group of marine organisms. The genus Arca is widely distributed across the world's oceans and plays a vital ecological role as a filter feeder and a food source for larger marine organisms. These mollusks are also of significant commercial importance, with some species being harvested for their meat in many countries.