I believe Gigas grow to be the largest of all tridacnas. Years ago, before color T.V. I always watched reruns of a movie where the native boy diving for black pearls always got his foot stuck in a giant clam. I think of that picture every time I hear the expression "Giant Clam" instead of "Tridacna".
I went snorkling in Aus. on the Great Barrier Reef last summer and there were clams (not sure if they were gigas) but they were about the size of VW Beetles!
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