Hyolitha - Orthothecida

Parent taxon: Orthothecida according to J. J. Sepkoski 2002

Sister taxa: Aldanotheca, Allathecidae, Ancheilotheca, Bolitheca, Brevitheca, Bucanotheca, Carinitheca, Chelsonella, Circothecidae, Contitheca, Curtitheca, Devoniotheca, Ebianotheca, Eogloborilus, Eonovitatus, Girvanolithes, Gracilithecidae, Hexitheca, Inflaticornus, Isititheca, Lophotheca, Malykanotheca, Minitheca, Mooritheca, Neobactrotheca, Nephrotheca, Nikatheca, Novitatidae, Novitatus, Orthotheca, Orthothecidae, Panitheca, Petasotheca, Plicitheca, Renitheca, Tcharatheca, Tchuranitheca, Tetratheca, Tetrathecidae

Subtaxa: none

Ecology: stationary epifaunal suspension feeder