Hyolitha - Orthothecida - Quadrothecidae
Full reference: J. M. Malinky. 2002. A revision of early to mid Ordovician hyoliths from Sweden. Palaeontology 45(3):511-555
Parent taxon: Orthothecida according to J. M. Malinky 2002
Sister taxa: Aldanothecidae, Allathecidae, Ancheilotheca, Bolitheca, Brevitheca, Bucanotheca, Carinitheca, Chelsonella, Circothecidae, Cupitheca, Curtitheca, Ebianotheca, Eogloborilus, Girvanolithes, Gracilithecidae, Grandicornus, Hexitheca, Inflaticornus, Isititheca, Khetatheca, Kotuyitheca, Lophotheca, Minitheca, Mooritheca, Neobactrotheca, Nikatheca, Novitatidae, Orthothecidae, Panitheca, Paragloborilus, Petasotheca, Plicitheca, Probactrotheca, Protowenellidae, Renitheca, Semielliptotheca, Sysoievia, Tchuranitheca, Tetratheca, Tetrathecidae, Triplicatellidae, Turcutheca
Subtaxa: Quadrotheca
Type: Quadrotheca
Ecology: stationary epifaunal suspension feeder
Distribution: