Hyolitha - Orthothecida - Orthothecidae

Full reference: V. A. Syssoiev. 1958. Superorder Hyolithoidea. Osnovy paleontologii. Molluski−golovonogie 2:184-190

Parent taxon: Orthothecidae according to D. W. Fisher 1962

Sister taxa: Bactrotheca, Cryptocaris, Lenatheca, Lentitheca, Quadrotheca, Semielliptotheca

Subtaxa: Trapezotheca aemulus, Trapezotheca bicostata

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Type: Hyolithus (Orthotheca) aemulus

Ecology: stationary epifaunal suspension feeder