Gyrodinium spp.
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Taxonomic Group: Dinoflagellate
Trophic Status: Autotrophic or Heterotrophic
Size Range: 9.5-57 ?m wide x 37.5-87 ?m long (LUMCON Guide); 23-155 ?m long (Kofoid and Swezy 1921); 11-200 ?m 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