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The soldier crab Mictyris longicarpus (Crustacea: Decapoda: Mictyridae)

Mictyris longicarpus

Credit: User:LiquidGhoul

Soldier crabs of the genus Mictyris, including M. longicarpus (pictured), congregate at low tide to feed by filtering mud. As the tide rises, they bury themselves, digging in a corkscrew pattern.