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Mictyris longicarpus (Decapoda: Mictyridae)
Mictyris longicarpus (Decapoda: Mictyridae)
Credit: 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.