Mastigonemes

Mastigonemes are lateral "hairs" found covering the flagella of heterokont and cryptophyte algae. They are approximately 15 nm in diameter, and usually consist of a tubular shaft that itself terminates in smaller "hairs". It is believed that they assist in locomotion by increasing the surface area of a flagellum. ...
Found on http://en.wikipedia.org/wiki/Mastigonemes

mastigonemes

Lateral projections from eukaryotic flagella. May be stiff and alter the hydrodynamics of flagellar propulsion, or flexible and alter the effective diameter of the flagellum (flimmer filaments).
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