Chaetoceros pendulus
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| Taxonomic Group: | Diatom |
| Trophic Status: | Autotrophic |
| Size Range: | 12.5-22.5 μm wide (LUMCON Guide); 9-18 μm wide (Cupp 1943) |
| Key Characteristics: | Upper valve with deep depression in the center or smoothly concave; lower valve with projecting corners and with long setae, emerging well inside valve margin proceeding outwards almost at right angles to pervalvar axis then curving downwards; many small chloroplasts, found far out into the setae |
| Confused With: | Chaetoceros peruvianus, which has setae of upper valve arising from near center |
| Toxin: | None known |