†family Pirasocrinidae Moore and Laudon 1943 (feather star)
Parent taxon: Pirasocrinoidea according to G. D. Webster et al. 2009
Sister taxa: none
Subtaxa: Affinocrinus, Hypermorphocrinus, Lasanocrinus, Metaperimestocrinus, Metutharocrinus, Perimestocrinus, Plaxocrinus, Stenopecrinus, Triceracrinus, Utharocrinus, Vertigocrinus
Ecology: stationary intermediate-level epifaunal suspension feeder