STRUCTURE AND SIGNIFICANCE OF THE CRYPTOMONAD FLAGELLAR APPARATUS. I.CRYPTOMONAS OVATA(CRYPTOPHYTA)1

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Abstract
The absolute configuration of the flagellar apparatus inCryptomonas ovatahas been elucidated and found to be similar to that reported forChilomonas paramecium.Variations apparent in the flagellar apparatus ofCryptomonas ovatainclude the presence of striations in the mitochondrion associated lamella, a rhizostyle which does not bear wing‐like extensions from the microtubules and does not lie close to the nucleus, and a striated fibrous anchoring structure associated with one basal body which has not hitherto been described. The flagellar apparatus also includes a four stranded microtubular root which traverses into the anterior dorsal lobe of the cell, a striated fibrous root which is associated with a five stranded microtubular root, and a two stranded Cr root. The homologous nature of these roots to those in the larger cryptomonads is discussed in relation to the apparent reduction in flagellar apparatus size and complexity among the smaller cryptomonads. A diagrammatic reconstruction of the flagellar apparatus ofCryptomonas ovatais also presented.