Crinoidea - Dendrocrinida - Pirasocrinidae
Parent taxon: Pirasocrinoidea according to G. D. Webster et al. 2009
See also Ubaghs et al. 1978 and Webster and Lane 2007
Sister taxa: none
Subtaxa: Aatocrinus Affinocrinus Dasciocrinus Eirmocrinus Exterocrinus Hypermorphocrinus Lasanocrinus Metaperimestocrinus Metutharocrinus Perimestocrinus Pirasocrinus Plaxocrinus Stenopecrinus Triceracrinus Utharocrinus Vertigocrinus
Type: Pirasocrinus
Ecology: stationary intermediate-level epifaunal suspension feeder
Distribution:
• Permian of Canada (1: British Columbia collection), the Russian Federation (1), United States (4: Nevada, Texas)
• Melekhovian of United States (2: Nebraska)
• Carboniferous of Brazil (1), China (1), United States (41: Arizona, Arkansas, Illinois, Iowa, Kansas, Kentucky, Nebraska, Oklahoma, Texas)
Total: 51 collections including 90 occurrences