A crab or any member of the order Brachyura; a short-tailed crustacean.
From 'brachyura' + '-an' (a member of), creating a noun that refers to an individual organism belonging to this crustacean order.
When you see a hermit crab or a coconut crab, you're looking at brachyurans—even though these seem different from typical crabs, they're all part of the same ancient order!
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