Hyolitha - Orthothecida

Full reference: V. A. Syssoiev. 1957. To the morphology, systematics and systematic position of hyoliths. Akademiya Nauk S.S.S.R. 116:304-307

Parent taxon: Orthothecida according to J. M. Malinky 1990

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

Subtaxa: Bactrotheca, Cryptocaris, Lenatheca, Lentitheca, Quadrotheca, Semielliptotheca, Trapezotheca

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Type: Orthotheca

Ecology: stationary epifaunal suspension feeder