Family Nostocaceae
Hormogoneae - Nostocales - Nostocaceae
Parent taxon: Nostocales according to B. Amard and J. Bertrand-Sarfati 1997
See also Andrews 1970, Licari 1978 and Sergeev et al. 1995
Sister taxa: Rivulariaceae, Scytonemataceae
Subtaxa: Anabaenidium Archaeoellipsoides Beckspringia Eosphaeronostoc
Ecology: stationary "photoautotroph"
Distribution:
• Tonian of Australia (1 collection), United States (1: California)
• Stenian of Canada (1: Nunavut)
• Ectasian of Canada (1: Nunavut), the Russian Federation (4)
• Calymmian of China (2), the Russian Federation (16)
• Orosirian of Gabon (1)
Total: 27 collections including 39 occurrences