| Taxonomic Group: | Dinoflagellate |
| Trophic Status: | Autotrophic |
| Size Range: | 25 ?m wide x 55-67.5 ?m long (LUMCON Guide); 21-23 ?m wide x 65-75 ?m long (Kofoid and Swezy 1921); 21-25 ?m wide x 36-75 ?m long (Dodge 1982) |
| Key Characteristics: | Unarmored, small to medium cell with a cigar-shaped body; epitheca exceeds hypotheca by less than 3 times width; chloroplasts present |
| Confused With: | Torodinium teredo, where the epitheca exceeds the hypotheca by more than 3 times width |
| Toxin: | None known |
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