†class Hyolithomorpha (mollusk)
Parent taxon: Hyolitha according to J. J. Sepkoski 2002
Sister taxa: Hyolithida, Orthothecida, Orthothecimorpha
Subtaxa: Calcitheca, Dilites, Eumorpholites, Nervolites, Ovalitheca, Parahyolithes, Sulcavitida, Toxeumorphorida
Ecology: stationary epifaunal suspension feeder