Boxer crabs feed sea anemones in exchange for defense from danger — serving as a prominent example of symbiosis in the animal kingdom.
Lybia tessellata is a tiny crustacean native to the tropical Indo-Pacific Ocean. These crabs are usually patterned with pink, brown, or yellow and reach about an inch in width. They bear slim claws and a front pair of walking legs that are longer than the other three pairs.
These crustaceans spend most of their time attached to reefs in shallow waters. They are known as ‘pom-pom’ or boxers crabs due to their unique presentation of sea anemones, which live attached to the crab’s claws and are often wielded similarly to ‘pom poms’ or boxing gloves.
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Sea anemones are brightly colored cnidarians with simple digestive systems and a single body cavity surrounded by dangerous tentacles.
The tentacles are covered in stinging cells called cnidocytes which act as defensive mechanisms and can assist in the capture of prey.