Tropidocyathus Milne-Edwards and Haime 1848 (stony coral)
Anthozoa - Scleractinia - Turbinoliidae
Parent taxon: Turbinoliidae according to S. D. Cairns 1997
Sister taxa: Alatotrochus, Alveolocyathus, Bothrophoria, Conocyathus, Cyathotrochus, Deltocyathoides, Foveolocyathus, Holcotrochus, Laminocyathus, Nicaeotrochus, Palocyathus, Paradeltocyathus, Peponocyathus, Sphenotrochus, Trematotrochus, Turbinolia, Wellsotrochus
Subtaxa: Tropidocyathus lessoni
Ecology: stationary intermediate-level epifaunal microcarnivore