Amarinus lacustris is a species of freshwater crab from Australia New Zealand and nearby islands where it lives in water of various salinities. It grows up to 10 mm (0.4 in) wide with an H-shaped groove on its back. It is an omnivore and is eaten by crayfish and fish. It was first discovered in Lake Pupuke near Auckland and is the only freshwater crab in New Zealand.
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