It happens more than it should, and, to be honest, we might think it's due to confusion and lack of knowledge, and not so much because they want to pass off Pacific scallops, Galician scallops, and the... washer (the three cheapest on the market) for an expensive and prized mollusk like the varied shell (the scallop(in Galician). The fact is that some (especially the Pacific scallop) and others might look similar, but they are different, very different. On the one hand, Galician scallops have a light, almost white, shell and an orange gonad. On the other hand, mixed shells have a dark shell, and their gonad is not orange but light-colored, like the rest of their body. They are bivalve mollusks, which means they have two parts, two valves, and they live in the Atlantic and also in the Mediterranean. However, there is a key difference between the two when they reach the market: mixed shells have a very high price because, in addition to the fishing bans that regulate them, their catch, when permitted, is scarce due to overexploitation, while scallops have a lower price and are caught more frequently.