Chaetoceros didymus
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| Taxonomic Group: | Diatom |
| Trophic Status: | Autotrophic |
| Size Range: | 19-22.5 μm wide (LUMCON Guide); 12-34 μm wide (Cupp 1943, Horner 2002); 10-40 μm wide (Tomas 1997) |
| Key Characteristics: | Setae arise from corners of cells, crossing at their base or sometimes far outside the chain; valves with a semicircular protuberance in the center; two chloroplasts per cell, pressed against the valves, each with a pyrenoid located in the protuberance |
| Confused With: | |
| Toxin: | None known |