A genus of marine dinoflagellates (tiny single-celled organisms) with distinctive horn-like projections, often found in ocean plankton.
From Greek 'keras' (horn), referring to the prominent horn-like appendages that extend from these microscopic creatures' bodies.
These are some of the ocean's smallest creatures, yet they're so abundant they can literally color the water—red tides are often caused by massive blooms of Ceratium dinoflagellates.
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