Karenia brevis
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| Taxonomic Group: | Dinoflagellate |
| Trophic Status: | Autotrophic |
| Size Range: | 24-36 μm wide x 23-34 μm long (Haywood et al. 2004) |
| Key Characteristics: | Cells slightly wider than long, ventrally concave and dorsally convex; apex of the epicone with a prominent apical process; hypocone slightly bilobed; nucleus round and located in left quadrant of hypocone; chloroplasts peripheral and lightly pigmented (Haywood et al. 2004) |
| Confused With: | Karenia papilionacea, which has a more pronounced hypothecal excavation and a more pointed apical protrusion |
| Toxin: | Brevetoxins |