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any of various minute floating animals of the genus Salpa, of warm oceans, having a transparent barrel-shaped body with openings at either end: class Thaliacea, subphylum Tunicata (tunicates) 樽海鞘
However, Deborah Cracknell, research lead from theNationalMarineAquariuminPlymouth, told MailOnline shebelievesthecreatureisaSalpa maggiore (Salpa maxima).