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curiosity number 025 Stefano Pace The Largest Clam     The largest shelled clam of the world is a bivalve, the Tridacna gigas (Linnaeus, 1758). Tropical Indo-Pacific species widely distributed, it seems able to reach 1,5 meters in length and about 300 kilograms of weight. Beautiful and fairly easy to meet in the water, its soft parts can be of more colours. The color variation depends on the fact that single-celled algae living on the mantle of the mollusk who feeds, which give, depending on the type present, shades ranging from green, to blue, to purple and even to black. The Tridacna gigas is capable of producing pearls, as well as several other bivalves, and its of course is the largest known, 640 grams of weight.