Aphanizomenon sp.
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| Taxonomic Group: | Cyanobacteria |
| Trophic Status: | Autotrophic |
| Size Range: | 2-3 ?m wide (LUMCON Guide) |
| Key Characteristics: | Terminal cells usually narrower and longer than the intercalary cells, sometimes much longer; terminal cells also contain fewer gas vacuoles and less pigment, and thus sometimes appear empty; filaments often in large bundles |
| Confused With: | Anabaena species, which can sometimes be found in bundles, but the terminal cells are neither almost devoid of visible contents nor notably narrower than the central ones |
| Toxin: | Anatoxins, cylindrospermopsin, saxitoxins |