Ceratium pentagonum
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| Taxonomic Group: | Dinoflagellate |
| Trophic Status: | Autotrophic |
| Size Range: | N/A |
| Key Characteristics: | Body pentagonal with straight sides to epitheca and abruptly forming straight apical horn that can be long or short; body wider than or equal to its length; posterior horns very short, less than length of hypocone body; surface with raised ornamentation |
| Confused With: | Ceratium hircus, which has two even hypothecal horns; Ceratium furca, which is more robust and has two uneven serrated hypothecal horns; Ceratium cf. lineatum, which is more delicate, and has a triangular epitheca that sharply transitions into a fairly long apical horn |
| Toxin: | None known |