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Ultrastructure of the red tide dinoflagellate Gymnodinium breve 1. General description
Steidinger, K.A.; Truby, E.W.; Dawes, C.J. (1978). Ultrastructure of the red tide dinoflagellate Gymnodinium breve 1. General description. J. Phycol. 14(1): 72-79
In: Journal of Phycology. Blackwell Science: New York. ISSN 0022-3646, more
Peer reviewed article  

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    Chloroplasts; Chromosomes; Cytoplasm; Dinoflagellates; Noxious organisms; Nuclei; Organelles; Phytoplankton; Red tides; Starch; Ultrastructure; Gymnodinium Stein, 1878 [WoRMS]; Gymnodinium breve C.C.Davis, 1948 [WoRMS]; Marine

Authors  Top 
  • Steidinger, K.A.
  • Truby, E.W.
  • Dawes, C.J.

    Gymnodimium breve Davis, an unarmored marine dinoflagellate has a cell covering (theca) composed of four membranes. The inner two membranes represent a vesicular layer and in tangential section, the theca appears composed of polygonal areas. Unusual threat ridges are located in the cingular region between the epi- and hypocone. This osmotically sensitive species is extremely vesiculate with dispersed areas of cytoplasm containing typical eukaryotic organelles as well as other organelles found only in dinoflagellates. The non-vesiculated cytoplasm is continuous in serial sections. The chloroplasts can contain either quasi-radial or parallel lamellae typically consisting of three thylakoids each. The pyrenoid is multiple-stalked and lacks a starch cap. The dinophycean pusule is simple and similar to those found in several unarmored marine species. The nucleus is typically dinophycean but the chromosomes appear to lack nonfibrillar material.

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