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Morphology and ultrastructure ofOlisthodiscus luteus (Raphidophyceae) with special reference to the taxonomy
Authors:Yoshiaki Hara  Isao Inouye  Mitsuo Chihara
Affiliation:(1) Institute of Biological Sciences, University of Tsukuba, Sakura-mura, 305 Ibaraki
Abstract:
A flattened discoid flagellate collected from the Seto Inland Sea, Japan, has been examined by light and electron microscopy. This alga agrees well withClisthodiscus luteus Carter. It has two heterodynamic flagella emerging from a furrow on the upward side of the cell that contains six to 13 yellow-green parietal chloroplasts. It does not rotate but smoothly glide while swimming. The cell has a thin periplast lying between the plasmalemma and chloroplasts. Neither lipid bodies nor mucocysts are seen in the periplast. The pyrenoid matrix being free from thylakoids is penetrated by several cytoplasmic canals from various directions. There are no vesicles of periplastidal network in the narrow space between chloroplast envelope and chloroplast ER. The ultrastructural features ofO. luteus are unique, sharing certain characters with the raphidophycean algae but others withPseudopedinella pyriformis, a unique member of the Chrysophyceae.
Keywords:Heterosigma    Olisthodiscus luteus   Raphidophyceae  Red tide flagellate  Taxonomy ofOlisthodisus   Ultrastructure ofOlisthodisus
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