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 Cyanobacteriota Oren et al. 2022 Class Chroococcophyceaeᵀ Hollerbach et al. 1953 Order Chroococcales corrig. Ardissone 1887 Family Hydrococcaceae Kützing 1843, sedis mutabilis 01 Genus †Eohyella Zhang and Golubić 1987 02 Genus †Myriasporella Oehler 1978 03 Genus †Palaeopleurocapsa Knoll et al. 1975 04 Genus †Scissilisphaera Knoll and Calder 1983 05 Genus Askenasya Möbius 1887 06 Genus Brachynema Ercegović 1931 07 Genus Chamaecalyx Komárek and Anagnostidis 1986 08 Genus Chondrocystis Lemmermann 1899 09 Genus Chroococcidium Geitler 1933 10 Genus Chroococcopsis Geitler 1925 11 Genus Cyanocystis Borzì 1882 12 Genus Cyanoderma Weber-van Bosse 1887 13 Genus Cyanosaccus Lukas and Golubić 1981 14 Genus Dalmatella Ercegović 1929 15 Genus Dermocarpella Lemmermann 1907 16 Genus Endonema Pascher 1929 17 Genus Epilithia Ercegović 1932 nom. illeg. 18 Genus Foliisarcina Alvarenga et al. 2016 19 Genus Hormathonema Ercegović 1929 20 Genus Hydrococcusᵀ Kützing 1833 nom. cons. 21 Genus Hydropodocapsa Molinari and Guiry 2021 22 Genus Hyella Bornet and Flahault 1888 23 Genus Myxohyella Geitler 1925 24 Genus Myxosarcina Printz 1921 25 Genus Nematoradaisia Geitler 1925 26 Genus Odorella Shalygin et al. 2019 27 Genus Onkonema Geitler 1933 28 Genus Pleurocapsa Thuret 1885 29 Genus Radaisia Sauvageau 1895 30 Genus Scopulonema Ercegović 1930 31 Genus Sinaiella Gruia 1965 32 Genus Solentia Ercegović 1927 33 Genus Stanieria Komárek and Anagnostidis 1986 34 Genus Tryponema Ercegović 1929 35 Genus Xenococcus Thuret 1880 36 Genus Xenotholos Gold-Morgan et al. 1994 37 Genus "Exococcus" Nägeli 1847 nom. inval.