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 Nostocales corrig. Borzì 1914 Family Scytonemataceae corrig. Frank 1886 01 Genus †Eoplectonema Liu 1984 02 Genus †Palaeoscytonema Edhorn 1973 03 Genus †Ramivaginalis Nyberg and Schopf 1984 04 Genus Aetokthonos Wilde and Johansen 2014 05 Genus Arthrosiphon Kützing ex Frank 1886 06 Genus Brachytrichia Zanardini ex Bornet and Flahault 1886 07 Genus Brasilonema Fiore et al. 2007 08 Genus Coleodesmiopsis corrig. Dutt et al. 1983 09 Genus Colteronema Copeland 1936 10 Genus Croatella Ercegović 1925 11 Genus Cronbergia Komárek et al. 2010 12 Genus Cyanophiothrix Molinari and Guiry 2021 13 Genus Dillwynella Bory ex Kuntze 1891 14 Genus Diplocolon Nägeli ex Bornet and Flahault 1886 15 Genus Drilosiphon Kützing ex Frank 1886 16 Genus Ewamiania McGregor and Sendall 2017 17 Genus Gloeochlamys Schmidle 1899 18 Genus Herpyzonema Weber-van Bosse 1913 19 Genus Iningainema McGregor and Sendall 2017 20 Genus Iyengariella Desikachary 1953 21 Genus Kalymmatonema Bohunická et al. 2025 22 Genus Kyrtuthrix Ercegović 1929 23 Genus Mastigocladopsis Iyengar and Desikachary 1946 24 Genus Parenchymorpha Tseng and Hua 1984 25 Genus Petalonema Berkeley ex Correns 1889 26 Genus Scytonemaᵀ Agardh ex Bornet and Flahault 1886 27 Genus Scytonematopsis Kiseleva 1930 28 Genus Spelaeonaias Lamprinou et al. 2016 29 Genus Symphyonema Jao 1944 30 Genus Symphyonemopsis Tiwari and Mitra 1969 31 Genus Symphyosiphon Kützing ex Frank 1886 32 Genus Voukiella Ercegović 1925 33 Genus "Chakia" Komárková et al. 2013 nom. inval. 34 Genus "Iphinoe" Lamprinou and Pantazidou 2011, nom. inval. 35 Genus "Loriellopsis" Hernández-Mariné and Canals 2011 nom. inval.