Porcelain crabs first appeared in the Tithonian period of the Late Jurassic, around 145 to 152 million years ago. This type of crab has a more compact and flat body. However, its body is quite fragile, and it often sheds its own limbs as a way to avoid predator attacks. These porcelain crabs had large claws that served as a tool to fight for territory, not to catch food.
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