Parent taxon: Spiraculata according to J.A. Waters and A.S. Horowitz 1993
See also Bohatý et al. 2024 and Lane et al. 2001
Sister taxa: Kadiskoblastus, Malchiblastus, Monoblastus, Monoschizablastus, Nucleocrinida, Tanablastus, Troosticrinida, Uyguroblastus, Xinjiangoblastus
Subtaxa: Ambolostomatidae Conuloblastidae Hyperoblastidae Orbitremitidae Pentremitidae
Ecology: stationary intermediate-level epifaunal suspension feeder
Distribution:
• Permian of Australia (6 collections)
• Carboniferous of Canada (5: Alberta, Northwest Territories, Yukon), Ireland (1), the United Kingdom (2), United States (131: Alabama, Arizona, Arkansas, Georgia, Illinois, Indiana, Iowa, Kentucky, Missouri, Montana, Nevada, New Mexico, Oklahoma, Pennsylvania, Tennessee, Utah, Virginia)
• Devonian of Australia (1), Canada (1: Ontario), China (8), Germany (14), Mongolia (1), Morocco (1), Spain (5), United States (13: Indiana, Michigan, New York, Ohio)
Total: 189 collections including 305 occurrences