Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
           Domain Bacteria Woese et al. 2024
             Kingdom Bacillatiᵀ (Gibbons and Murray 1978) Oren and Göker 2024
               [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 Hapalosiphonaceae Elenkin (1917), nom. cons.] see Family Hapalosiphonaceae Elenkin 1917
                       [Genus Parthasarathiella N. Suba Raju (1962)] see Genus Parthasarathiella Suba Raju 1962
                       01 ?[Genus Albrightia Copel. (1936) [monotypic]] see Genus Albrightia Copeland 1936
                       02 ?[Genus Baradlaia P. Palik (1960) [monotypic]] see Genus Baradlaia Palik 1960
                       03 ?[Genus Brachytrichiopsis Jao (1944)] see Genus Brachytrichiopsis Jao 1944
                       04 ?[Genus Chondrogloea W. Schmidle (1901)] see Genus Chondrogloea Schmidle 1901
                       05 ?Genus Dictyophoron Komárek, Komárková, Ventura, Kozlíková-Zapomělová & Rejmánková (2017)
                       06 ?[Genus Fischerellopsis Fritsch (1932)] see Genus Fischerella (Bornet and Flahault 1886) Gomont 1895
                       07 ?[Genus Handeliella Skuja (1937)] see Genus Handeliella Skuja 1937
                       08 ?[Genus Hapalosiphonᵀ C. Nägeli ex Bornet & Flahault (1886)] see Genus Hapalosiphon Nägeli ex Bornet and Flahault 1886
                       09 ?[Genus Hyphomorpha A. Borzì (1916)] see Genus Hyphomorpha Borzì 1916
                       10 ?[Genus Leptopogon Borzì (1907)] see Genus Leptopogon Borzì 1907
                       11 ?[Genus Letestuinema Frémy (1930)] see Genus Letestuinema Frémy 1930
                       12 ?[Genus Loefgrenia Gomont (1896)] see Genus Loefgrenia Gomont 1896
                       13 ?[Genus Loriella A. Borzì (1892)] see Genus Loriella Borzì 1892
                       14 ?[Genus Mastigocoleopsis Geitler (1925)] see Genus Mastigocoleopsis Geitler 1925
                       15 ?[Genus Matteia A. Borzì (1907)] see Genus Matteia Borzì 1907
                       16 ?[Genus Schmidleinema G.De Toni (1936)] see Genus Schmidleinema De Toni 1936
                       17 ?[Genus Spelaeopogon Borzì (1907)] see Genus Spelaeopogon Borzì 1907
                       18 ?[Genus Thalpophila Borzì (1907)] see Genus Thalpophila Borzì 1907
                       19 ?[Genus Westiella Borzì (1907)] see Genus Westiella Borzì 1907
                       20 [Genus Chlorogloeopsis A.K. Mitra & D.C. Pandey (1967)] see Genus Chlorogloeopsis Mitra and Pandey 1967
                       21 [Genus Fischerella (Bornet & Flahault) Gomont (1895)] see Genus Fischerella (Bornet and Flahault 1886) Gomont 1895
                       22 [Genus Mastigocladus F.J. Cohn ex O. Kirchner (1898)] see Genus Mastigocladus Cohn ex Kirchner 1898
                       23 [Genus Neowestiellopsis Kabirnataj, Nematzadeh, Talebi, Tabatabaei & Singh (2018)] see Genus Neowestiellopsis Kabirnataj et al. 2018
                       24 [Genus Nostochopsis Wood ex Bornet & Flahault (1886)] see Genus Nostochopsis Wood ex Bornet and Flahault 1886
                       25 [Genus Pelatocladus Johansen & Vaccarino (2016)] see Genus Pelatocladus Johansen and Vaccarino 2016
                       26 [Genus Reptodigitus D.A. Casamatta, C.D. Villanueva, H.S. Stocks, M. Vaccarino & J.R. Johansen (2020)] see Genus Reptodigitus Casamatta et al. 2020
                       27 [Genus Westiellopsis Janet (1941)] see Genus Westiellopsis Janet 1941