Parent taxon: Blastoidea according to P. A. Jell 1983
See also Bauer et al. 2019, Beaver et al. 1967, Fay and Wanner 1967 and Sepkoski 2002
Sister taxa: Coronoidea, Eublastoidea, Granatocrinida, Lysocystites, Macurdablastus, Pentremitida, Troosticrinida, Zygocrinus
Subtaxa: Angulatoblastus Artuschisma Astrocrinidae Brachyschismatidae Codasteridae Dolichoblastus Kazachstanoblastus Leptoschisma Mastoblastus Neoschismatidae Orophocrinidae Pachyblastus Phaenoschismatidae Tympanoblastus Xenoblastus
Ecology: stationary intermediate-level epifaunal suspension feeder
Distribution:
• Permian of Australia (13 collections), Bolivia (1), East Timor (1), Indonesia (5), Oman (1), the Russian Federation (1)
• Carboniferous of Belgium (1), Canada (1: Nunavut), Ireland (2), Kazakhstan (1), the United Kingdom (3), United States (17: Arkansas, Illinois, Indiana, Iowa, Kentucky, Missouri, New Mexico, Oklahoma, Tennessee, Texas)
• Devonian of Australia (2), Canada (2: Ontario), China (2), the Czech Republic (3), Mongolia (1), Morocco (1), South Africa (4), Spain (2), United States (11: Indiana, Kentucky, New York, Tennessee)
• Silurian of United States (15: Indiana, Iowa, Missouri, Oklahoma, Tennessee)
Total: 90 collections including 129 occurrences