microcystaceae microcystaceae microcystaceae is family of cyanobacteria which contains the harmful algal bloom microcystis aeruginosa. microcystaceae microcystis aeruginosa scientific classification domain: bacteria phylum: cyanobacteria class: cyanophyceae order: chroococcales family: microcystaceaeelenkin genera cyanocomperia hindák 2002 microcystis kützing ex lemmermann 1907 planctocyanocapsa hindák 2002 radiocystis skuja 1948 sphaerocavum azevedo & sant'anna 2003 characteristics the family is characterized by single, floating cells or colonies which are embedded to a matrix. there is also a lack of differentiation between apical and basal structures.