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 |