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adj. having the structure of a normal feather

adj. Like or pertaining to a normal feather.

In ornithology, having the structure of a penna or contour-feather; not plumulaceous.

In entomology, resembling the web of a feather; having fine, close, parallel lines springing diagonally from a single line: applied to color-marks and sculpture.

"Together the results favor an evolutionary sequence of feather filaments splitting to form primitive barbs without barbules - radially symmetric downy feathers with plumulaceous barbs- bilaterally symmetric plumulaceous feathers - bilaterally symmetric pennaceous vanes - bilaterally asymmetric vanes Fig."