Which is the largest aquatic carnivore in the order Carnivora?

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The largest aquatic carnivore in the order Carnivora is the elephant seal (genus Mirounga).123

These animals are members of the family Phocidae and are classified as pinnipeds, a group of aquatic mammals within the order Carnivora that also includes sea lions, fur seals, and the walrus. Male elephant seals are significantly larger than females, reaching lengths of approximately 6.5 metres (21 feet) and weights of up to 3,700 kg (8,150 pounds).231