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pinnula Finlet one of a series of small fins consisting of a few rays each, separate from each other and found posterior to the dorsal and anal fins, e.g. in Scombridae. 離鰭由一些鰭條組成的一系列小鰭，彼此間是分開的而且是在背鰭與臀鰭的後麪，例如存在於鯖科魚類。