Phylum Cyanobacteria Garcia-Pichel et al. (2020) see Phylum Cyanobacteriota Oren et al. 2022
   Class Cyanophyceae Hauck (1885) see Class Chroococcophyceae Hollerbach et al. 1953
     Order Nostocales Borzì (1914) see Order Nostocales corrig. Borzì 1914
       Family Rhizonemataceae Büdel & Kauff ex Lücking & Barrie (2014), incertae sedis [monotypic] see Family Rhizonemataceae Büdel and Kauff ex Lücking and Barrie 2014
         1 ?Genus Rhizonema Lücking & Barrie (2014) see Genus Rhizonema Lücking and Barrie 2014