†subfamily Actinocystinae Wedekind 1927 (horn coral)
Anthozoa - Stauriida - Ptenophyllidae
Parent taxon: Ptenophyllidae according to D. Hill 1981
Sister taxa: Eddastraea, Gaynaphyllum, Laroonaphyllum, Ptenophyllinae
Subtaxa: Cymatelasma Cymatella Dubrovia Spongophylloides
Ecology: stationary epifaunal suspension feeder
Distribution:
• Devonian of Mongolia (2 collections), the Russian Federation (11), United States (1: Pennsylvania)
• Silurian of the Czech Republic (1), Mongolia (1), Poland (1), the Russian Federation (5), Sweden (1), Ukraine (5), the United Kingdom (1), United States (2: Oklahoma, Virginia), Venezuela (1)
Total: 32 collections including 39 occurrences