Stenocyathus Pourtales 1871 (stony coral)
Anthozoa - Scleractinia - Guyniidae
Alternative spelling: Stenocathus
Parent taxon: Guyniidae according to J. W. Wells 1956
Sister taxa: Cyathosmilia, Guynia, Onchotrochus, Pourtalocyathus, Schizocyathus
Subtaxa: Stenocyathus alabamiensis, Stenocyathus hoffmeisteri, Stenocyathus vermiformis
Ecology: stationary intermediate-level epifaunal suspension feeder