Ceratium hircus

Click on image to view photo information.
   
   

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