Aphanizomenon sp.

Click on image to view photo information.
   

Taxonomic Group:Cyanobacteria
Trophic Status:Autotrophic
Size Range:2-3 μm 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