Ceratium hircus
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Taxonomic Group: Dinoflagellate
Trophic Status: Autotrophic
Size Range: 32.5-45 μm wide x 137.5-200 μm long (LUMCON Guide); 28-41 μm wide x 179-219 μm long (Steidinger & Williams 1970)
Key Characteristics: Two even hypothecal horns
Confused With: Ceratium furca, which has two uneven serrated hypothecal horns; Ceratium pentagonum, which has a more pentagonal body that abruptly forms apical horn and very short posterior 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