
Gymnodinium is a genus of dinoflagellates. It is one of the few naked dinoflagellates, or species lacking armor (cellulosic plates). Since 2000, the species which had been considered to be part of Gymnodinium have been divided into several genera, based on the nature of the apical groove and partial LSU rDNA sequence data. Amphidinium was redefine...
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http://en.wikipedia.org/wiki/Gymnodinium

genus of marine or freshwater dinoflagellates. Members of the genus are bilaterally symmetrical with a delicate pellicle (or envelope) and ...
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http://www.britannica.com/eb/a-z/g/85

Type: Term Pronunciation: jim′nō-din′ē-ŭm Definitions: 1. Genus of marine dinoflagellates that includes the unicellular organism that causes red tide.
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http://www.medilexicon.com/medicaldictionary.php?t=38816

any marine or freshwater dinoflagellate of the genus Gymnodinium, certain species of which cause red tide.
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https://www.infoplease.com/dictionary/gymnodinium
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