Gyrosigma sp.

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Taxonomic Group:Diatom
Trophic Status:Autotrophic
Size Range:17.5-22.8 μm wide x 97.5-163.4 μm long (LUMCON Guide)
Key Characteristics:Valves sigmoid with two large plate like chloroplasts, one against each side of the girdle and often highly lobed; striae are longitudinal and transverse but these are not always visible with light microscopy
Confused With:Pleurosigma spp., which have two or four ribbon-like chloroplasts and striae that are oblique and transverse but these are not always visible with light microscopy
Toxin:None known