†family Palaeocyclidae Dybowski 1873 (horn coral)
Anthozoa - Cystiphyllida - Palaeocyclidae
Parent taxon: Cystiphyllida according to D. Hill 1981
Sister taxa: Cystiphyllidae, Digonophyllidae, Fletcheriidae, Goniophyllidae, Holmophyllidae, Tryplasmatidae
Subtaxa: Bojocyclus Palaeocyclus Primitophyllum Rhabdocyclus
Ecology: stationary epifaunal suspension feeder
Distribution:
• Devonian of Morocco (2 collections)
• Silurian of Canada (5: British Columbia, Quebec), China (2), Ireland (1), Sweden (4), the United Kingdom (5), United States (10: California, Iowa, Kentucky, Nevada, New York)
• Ordovician to Silurian of Canada (2: Northwest Territories)
• Ordovician of Estonia (6), the Russian Federation (1)
Total: 38 collections including 43 occurrences