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Defining Characteristics:
- Colony forming? No
- Filamentous? Yes, planktonic
- Solitary filaments
- Generally straight morphology
- Cylindrical cells
- Cells generally shorter than wide
- 4-12 µm wide
- Apical cells often rounded
- Sheath may be present
- Aerotopes present
- Heterocysts and akinetes absent
- Could be confused with: Aphanizomenon
