Nausithoe sp., Nausithoidae, coronate jellyfish, polyps, cnidarians, jellyfishes, marine invertebrates, sponges (porifera), behavior, interspecific relationships, symbiosis, mutualism, inquilinism, underwater, El Hierro Island, Canary Islands, Spain, Atlantic Ocean.

Remarks: Some jellyfish are polyp-shaped during the larval stage. In this case the polyps live temporaly inside a sponge. Both especies obtain benefit (mutualism). Polyps find protection inside the sponge (inquilinism) and the sponge benefits from the stinging cells of the jellyfish to avoid being eaten. In addition, the sponge uses the external structure of the polyp as if it was an internal skeleton. Unidentified sponge.

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