Skeletonema costatum
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| Taxonomic Group: | Diatom |
| Trophic Status: | Autotrophic |
| Size Range: | 5.7-10.0 ?m wide x 5.0-13.3 ?m long (LUMCON Guide); 3-20 ?m wide (Cupp 1943); 2-21 ?m wide (Horner 2002, Tomas 1997) |
| Key Characteristics: | Cells elliptical or cylindrical with rounded ends; valve face convex to flat, with a row of robust tubular processes at the edge of the valve that interlock midway between adjacent cells; space between cells may be long or short; chains long, usually straight; one (often appears C-shaped) or two chloroplasts |
| Confused With: | other Skeletonema species, especially S. subsalsum |
| Toxin: | None known |