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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. 离鳍由一些鳍条组成的一系列小鳍，彼此间是分开的而且是在背鳍与臀鳍的后面，例如存在于鲭科鱼类。