Fine structure of the scale-covered green flagellateMantoniella squamata(Manton et Parke) Desikachary

Abstract
New observations on the interphase morphology of the scale-covered green flagellate M. squamata (Manton et Parke) Desikachary are presented. Observation of a previously undescribed reduced flagellum in the organism was made. This 2nd flagellum is composed of 9 outer doublet microtubules and has no rootlet system or transition region associated with its basal body. This differs from the long flagellum of the cell which has a normal 9 + 2 microtubular array and a complement of 2 rootlets composed of 4 and 2 microtubules, respectively. The presence of a 2nd reduced flagellum in this alga confirms the transfer of Micromonas squamata from its original assignment in the uniflagellate genus Micromonas Manton et Parke to a new genus Mantoniella Desikachary. Similarities between this genus and other scaly biflagellate genera are discussed.

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