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