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 |