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This gigantic snail shell (empty when found), was deep brown, about 4" long from tip to its longest point. it had a deep umbilical hole, and the surface was worn and pitted.
It was spotted at the edge of a lagoon near the Amazon River.
These are said to be edible, but undercooked can transfer some nasty organisms to your system. It is considered invasive, and has spread to the southern US states