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ULTRASTRUCTURE OF THE RED TIDE DINOFLAGELLATE GYMNODINIUM BREVE. I. GENERAL DESCRIPTION 1, 2, 3
Author(s) -
Steidinger Karen A.,
Truby Earnest W.,
Dawes Clinton J.
Publication year - 1978
Publication title -
journal of phycology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.85
H-Index - 127
eISSN - 1529-8817
pISSN - 0022-3646
DOI - 10.1111/j.1529-8817.1978.tb00634.x
Subject(s) - dinoflagellate , pyrenoid , biology , ultrastructure , cytoplasm , organelle , gymnodinium , thylakoid , chloroplast , biophysics , botany , microbiology and biotechnology , biochemistry , ecology , phytoplankton , nutrient , gene
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.