PSEUDO-NITZSCHIA AS A GENUS DISTINCT FROM NITZSCHIA (BACILLARIOPHYCEAE)1

Authors


  • 1

    Received 10 November 1993. Accepted 22 July 1994.

  • This work was supported by grant 456.92/006 from the Norwegian Research Council for Science and the Humanities. The technical assistance given by the Electron Microscopical Unit for Biological Sciences at the University of Oslo is greatly appreciated. I also thank Erik E. Syvertsen for assistance and valuable discussions and David G. Mann, who read an early version of the manuscript and offered valuable suggestions and generously permitted the use of his original drawing.

ABSTRACT

Morphologic, diagnostic characters of the subgenus Nitzschia, genus Nitzschia Hassall 1845, and the marine planktonic genus Pseudo-nitzschia H. Peragallo in H. & M. Peragallo 1900 were compared. Colony formation by overlap of cell ends; weakly silicified, shallow, and flattened valves; an extremely eccentric raphe, not elevated above the general level of the valve; lack of con-opea; and striated girdle bands characterize Pseudo-nitzschia as a natural group and a genus separate from Nitzschia.

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