Ceratium macroceros
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| Taxonomic Group: | Dinoflagellate |
| Trophic Status: | Autotrophic |
| Size Range: | 45-55 μm wide x 50-60 μm long (Dodge 1982); 45-55 μm wide x up to 400 μm long (Horner 2002) |
| Key Characteristics: | Angular box-like body that abruptly forms an offset apical horn directed to the right; left and right hypothecal horns formed abruptly from body; left horn curves anteriorly, right horn bends to the right and almost parallels the apical horn |
| Confused With: | At first glance, with Ceratium tripos, which has a more robust body and hypothecal horns |
| Toxin: | None known |