Parent taxon: Hormogoneae according to B. Amard and J. Bertrand-Sarfati 1997
See also Horodyski and Donaldson 1980, Kundal 2014, Licari 1978, Schopf and Blacic 1971 and Sergeev et al. 1995
Sister taxa: Orculiphycus, Oscillatoriales, Siphonophycus, Veteronostocale
Subtaxa: Nostocaceae Rivulariaceae Scytonemataceae
Ecology: stationary "photoautotroph"
Distribution:
• Eocene of the United Kingdom (2 collections)
• Cretaceous of Chile (1), Romania (6), South Sudan (1), the United Kingdom (2)
• Jurassic to Cretaceous of Austria (1)
• Triassic of Greece (3), Oman (1), Slovenia (1)
• Devonian of China (1), the Russian Federation (1)
• Ordovician of Canada (2: Quebec), China (1), Norway (1), Sweden (1), United States (2: Tennessee)
• Tonian of Australia (2), Canada (3: Yukon), the Russian Federation (1), United States (1: California)
• Stenian of Canada (1: Nunavut)
• Ectasian of Canada (1: Nunavut), the Russian Federation (5)
• Calymmian of China (2), the Russian Federation (20)
• Statherian of India (1)
• Orosirian of Gabon (1)
Total: 65 collections including 87 occurrences