Gyrodinium spp.

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Taxonomic Group:Dinoflagellate
Trophic Status:Autotrophic or Heterotrophic
Size Range:9.5-57 μm wide x 37.5-87 μm long (LUMCON Guide); 23-155 μm long (Kofoid and Swezy 1921); 11-200 μm long (Dodge 1982)
Key Characteristics:Unarmored small to large cells that are fusiform, ovoid, or tear-shaped and sometimes compressed dorsoventrally or laterally; cingulum displaced more than one-fifth body length and more than one-third body length in many species; cell surface smooth or striate
Confused With:Distinguished from Gymnodinium species based on whether the cingulum displacement is more or less than one-fifth the body length, but use of this characterization is debated
Toxin:None known