Anthozoa - Stauriida - Ptychophyllidae
Parent taxon: Cyathophyllina according to D. Hill 1981
Sister taxa: Bethanyphyllidae, Campophyllidae, Cyathophyllidae, Eridophyllidae, Zaphrentidae
Subtaxa: Cyathactis Implicophyllum Ptychophyllum
Ecology: stationary epifaunal suspension feeder
Distribution:
• Devonian of Canada (6: Alberta, British Colombia-Alberta, British Columbia, Northwest Territories collections), Vietnam (1)
• Silurian of Australia (1), Canada (17: British Columbia, Northwest Territories, Ontario, Quebec), China (1), Estonia (1), India (1), Japan (1), Mongolia (1), the Russian Federation (11), the United Kingdom (1), United States (15: Alaska, California, Iowa, Kentucky, Nevada)
• Ordovician to Silurian of the Russian Federation (1)
• Ordovician of Canada (1: Quebec)
Total: 59 collections including 67 occurrences