†superfamily Sigmocoscinoidea Bedford and Bedford 1939 (archaeocyath sponge)
Parent taxon: Erismacoscinina according to F. Debrenne et al. 2015
Sister taxa: Coscinoptyctoidea, Ethmocoscinoidea, Kasyricyathoidea, Mootwingeecyathoidea, Polycoscinoidea, Porocoscinoidea, Salairocyathoidea
Subtaxa: Sigmocoscinidae Sylviacoscinidae
Type: Sigmocoscinus
Ecology: stationary intermediate-level epifaunal suspension feeder
Distribution: found only at Starshot Glacier reefs (Cambrian of Antarctica)