Prorocentrum gracile
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| Taxonomic Group: | Dinoflagellate |
| Trophic Status: | Autotrophic |
| Size Range: | 19-20.9 ?m wide x 43.7-47.5 ?m long (LUMCON Guide); 40-60 ?m long (Dodge 1982, Horner 2002) |
| Key Characteristics: | Cell elongate with rounded anterior end and pointed posterior end; anterior winged spine long and sharp with a broad base; body at least and sometimes more than 2X as long as broad |
| Confused With: | Prorocentrum micans, which has a shorter spine and a broader body (less than 2X long as broad); Prorocentrum triestinum, which has a more blunt posterior end, a less robust spine, and is much smaller, usually less than 30 μm long |
| Toxin: | None known |