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Filoplumes. (a) Ventral (top) and dorsal (bottom) filoplumes. The ventral filoplume has three barbs, whereas the dorsal filoplume has two barbs at the tip. Ventral filoplume is 14.6 mm in length and dorsal filoplume is 7.1 mm. (b(i,ii)) Filoplumes, varying in length and size, at the base of rachis of contour feathers. (Online version in colour.)
