Bacteriastrum spp.
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Taxonomic Group: Diatom
Trophic Status: Autotrophic
Size Range: 6-15 μm diameter (Cupp 1943); 6-20 μm diameter (Tomas 1997)
Key Characteristics: Cells cylindrical, with more than two setae per valve, regularly arranged around its margin; terminal setae differ from the others, not fused or branched and often curved; setae of adjacent cells fused for a certain distance, dividing further out and branching (bifurcation); chloroplasts small and numerous
Confused With: Chaetoceros species, which have generally two setae per valve
Toxin: None known