Edrioasteroidea - Pyrgocystidae
Parent taxon: Edrioasteroidea according to C. D. Sumrall and S. Zamora 2011
Sister taxa: Aragocystites, Camptostroma, Cyathocystida, Cyathothecidae, Edrioasterida, Edrioblastoida, Hemicystitidae, Isorophida, Isorophina, Isorophinidae, Kailidiscus, Stromatocystitida, Stromatocystitidae, Yorkicystitidae
Subtaxa: Archaepyrgus Argodiscus Belochthus Epipaston Fanulodiscus Moroccopyrgus Pyrgocystis Streptaster
Type: Pyrgocystis
Ecology: stationary low-level epifaunal suspension feeder
Distribution:
• Devonian of Germany (1 collection), Morocco (1)
• Silurian of Australia (1), Canada (1: Ontario), Sweden (3), United States (3: Iowa, New York)
• Dobrotivian of Morocco (1)
• Ordovician to Silurian of United States (1: Illinois)
• Ordovician of Morocco (6), the United Kingdom (1), United States (25: Illinois, Illinois, Iowa, Iowa, Iowa, Illinois, Kentucky, Minnesota, Ohio, Oklahoma, Tennessee)
Total: 44 collections including 48 occurrences