An oikopluerid, or larvacean inside its elaborately shaped gelatinous house. Used as a filtration apparatus for feeding, this structure is replaced after a couple of days. The animal within will swim out to make a new one as this one sinks to the seafloor.

An oikopluerid, or larvacean inside its elaborately shaped gelatinous house. Used as a filtration apparatus for feeding, this structure is replaced after a couple of days. The animal within will swim out to make a new one as this one sinks to the seafloor. Image courtesy of the NOAA Office of Ocean Exploration and Research, Deep-Sea Symphony: Exploring the Musicians Seamounts.

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