What is the biggest scallop?

Can you tell me, what is the largest scallop known to exist? Are there any specific species that are notably larger than others? Are there any geographic regions that are known to harbor these giant scallops? How do scientists determine the size of scallops, and have there been any recent discoveries or records broken in terms of the largest scallop ever found? Additionally, are there any cultural or culinary significance associated with the largest scallops?