Chaetoceros subtilis var. abnormis f. simplex
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| Taxonomic Group: | Diatom |
| Trophic Status: | Autotrophic |
| Size Range: | 4-5 μm wide (LUMCON Guide) |
| Key Characteristics: | Cells solitary or in short straight or curved chains with no apertures between cells; valves longer than wide, with only one seta per cell which is fairly thick; one or two chloroplasts per cell |
| Confused With: | Chaetoceros subtilis var. abnormis, which has more than one seta per cell, like Chaetoceros subtilis |
| Toxin: | None known |