Ceratium fusus

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Taxonomic Group:Dinoflagellate
Trophic Status:Autotrophic
Size Range:26.6-39.6 μm wide x 432.3-643.5 μm long (LUMCON Guide); 15-30 μm wide x 200-300 μm long (Dodge 1982, Horner 2002); 17-36 μm wide x 204-725 μm long (Steidinger & Williams 1970)
Key Characteristics:Large fusiform cell with fully developed apical and left hypothecal horns, and a rudimentary right hypothecal horn; left horn can be slightly curved to straight; epitheca gradually tapers into apical horn
Confused With:Ceratium extensum which is larger (greater than 1mm) with a long and straighter left hypothecal horn
Toxin:None known