The decision by the International Committee on Systematics of Prokaryotes (ICSP) to place the rank of phylum under the rules of the International Code of Nomenclature of Prokaryotes (ICNP), with phylum names ending in -ota based on the name of a type genus, enables the valid publication of the phylum name Cyanobacteriota with Cyanobacterium as the type genus. The names Cyanobacterium and its type species Cyanobacterium stanieri were effectively published in 1983 by Rippka and Cohen-Bazire, but the names were not validly published under the rules of the ICNP (then named the International Code of Nomenclature of Bacteria) or the rules of the ICN (International Code of Nomenclature for algae, fungi, and plants, then named the International Code of Botanical Nomenclature). We here propose the names Cyanobacterium gen. nov and Cyanobacterium stanieri sp. nov. for valid publication under the provisions of the ICN. Upon validation these names are also validly published under the ICNP according to General Consideration 5 and Rule 30. We also propose the phylum name Cyanobacteriota phyl. nov. under the rules of the ICNP.

Biology Centre of the Czech Academy of Sciences Institute of Hydrobiology Na Sádkách 702 7 370 05 České Budějovice Czech Republic

Department of Plant and Environmental Sciences The Institute of Life Sciences The Hebrew University of Jerusalem Edmond J Safra Campus 9190401 Jerusalem Israel

Unité des Cyanobactéries Institut Pasteur Centre National de la Recherche Scientifique 2172 75724 Paris Cedex 15 France

University of South Bohemia Faculty of Science Branišovká 1760 370 05 České Budějovice Czech Republic

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Revision and expansion of the genus Spirirestis (Tolypothrichaceae, Cyanobacteria)