†family Sigmocyathidae Krasnopeeva 1953 (archaeocyath sponge)

Archaeocyatha - Ajacicyathida - Sigmocyathidae

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

Sister taxon: Wrighticyathidae

Subtaxa: Didymocyathus Sigmocyathus

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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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