Chaetoceros diadema
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Taxonomic Group: Diatom
Trophic Status: Autotrophic
Size Range: 7.5-23.0 μm wide (LUMCON Guide); 12-44 μm wide (Cupp 1943); 10-50 μm wide (Horner 2002); 10-33 μm wide (Rines & Hargraves 1988)
Key Characteristics: One chloroplast wrapped valve to valve (sometimes cup-shaped); adjacent cells do not touch, apertures wide; setae originate inside valve margin, are stiff and short, easily broken; occasional pairs of heavier intercalary setae strongly directed toward chain end; one seta of each pair lies near apical axis, the other along the transapical axis (focus up and down to see this)
Confused With: Chaetoceros brevis, which also has one chloroplast and wide apertures between cells, but do not have setae in different planes
Toxin: None known