†order Parablastoidea Hudson 1907
Parent taxon: Blastozoa according to J. Sprinkle and C. D. Sumrall 2008
See also Beaver et al. 1967, Hudson 1907 and Sepkoski 2002
Sister taxa: Asteroblastida, Blastoidea, Crinoidea, Diploporita, Eocrinoidea, Glyptosphaeritida, Lepidocystoidea, Paracrinoidea, Rhombifera, Rhombifera, Soluta, Sphaeronitida
Subtaxa: Blastocystidae Meristoschisma Pachyocrinus
Ecology: stationary epifaunal suspension feeder
Distribution:
• Chazyan of Canada (9: Quebec collections), United States (3: New York)
• Whiterockian of United States (6: California, Nevada, Utah)
• Ordovician of Canada (5: Quebec), the United Kingdom (1), United States (17: Idaho, Kentucky, Nevada, New York, Tennessee, Utah)
Total: 41 collections including 44 occurrences