Archaeocyatha - Ajacicyathida

Parent taxon: Ajacicyathina according to F. Debrenne et al. 2015

Sister taxa: Annulocyathoidea, Bronchocyathoidea, Erbocyathoidea, Ethmophylloidea, Lenocyathoidea, Pretiosocyathoidea, Tercyathoidea, Tumulocyathoidea

Subtaxa: Sigmocyathidae Wrighticyathidae

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Type: Sigmocyathus

Ecology: stationary intermediate-level epifaunal suspension feeder

Distribution: found only at Starshot Glacier reefs (Cambrian of Antarctica)

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