†Cyathosmilia Tenison-Woods 1878 (stony coral)
Anthozoa - Scleractinia - Guyniidae
Parent taxon: Guyniidae according to J. W. Wells 1956
Sister taxa: Guynia, Onchotrochus, Pourtalocyathus, Schizocyathus, Stenocyathus
Subtaxa: Cyathosmilia velata
Ecology: stationary intermediate-level epifaunal suspension feeder