An olive-colored empty egg case of a cartilaginous fish--either a skate, ray, or shark--attached to the octocoral Swiftia koreni.

An olive-colored empty egg case of a cartilaginous fish – either a skate, ray, or shark – attached to the octocoral Swiftia koreni. Image courtesy of the NOAA Office of Ocean Exploration and Research, Gulf of Mexico 2017.

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