Skeletonema costatum

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Taxonomic Group:Diatom
Trophic Status:Autotrophic
Size Range:5.7-10.0 μm wide x 5.0-13.3 μm long (LUMCON Guide); 3-20 μm wide (Cupp 1943); 2-21 μm 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