Blastoidea - Spiraculata - Pentremitidae
Parent taxon: Spiraculata according to G. D. Webster and P.A. Jell 1992
See also Beaver et al. 1967
Sister taxa: Arcuoblastus, Conuloblastus, Costatoblastus, Deliablastus, Diploblastidae, Euryoblastus, Gongyloblastus, Iranoblastus, Kadiskoblastus, Malchiblastus, Monoblastus, Monoschizablastus, Montanablastus, Nucleocrinidae, Orbitremitidae, Perittoblastus, Pyramiblastus, Sinopetaloblastus, Tanablastus, Tanaoblastus, Uyguroblastus, Xinjiangoblastus, Xyeleblastus
Subtaxa: Ambolostoma Belocrinus Cordyloblastus Pentremites Pentremoblastus Rhopaloblastus
Ecology: stationary intermediate-level epifaunal suspension feeder
Distribution:
• Permian of Australia (5 collections)
• Carboniferous of Canada (5: Alberta, Northwest Territories, Yukon), United States (127: Alabama, Arizona, Arkansas, Georgia, Illinois, Indiana, Iowa, Kentucky, Montana, Nevada, New Mexico, Oklahoma, Pennsylvania, Tennessee, Utah, Virginia)
Total: 137 collections including 243 occurrences