Wikipedia
Veneroida
The Veneroida or veneroids are an order of mostly saltwater but also some freshwater bivalve molluscs. This order includes many familiar groups such as many clams and cockles that are valued for food, and a number of freshwater bivalves including the invasive species of zebra mussels.
Until recently, the Carditoida (cockles and their allies) were usually included in this group.