Trochocyathus is a genus of corals in the family Caryophylliidae. Living species are found in waters near Hawai'i at depths of . Fossil species are found as far back as the latest Paleocene in the Dilwyn Formation of Australia, in the late Cretaceous in the Woodbury Formation of New Jersey, and in Suffolk.
Platycyathus was sometimes regarded as a subgenus within Trochocyathus.
Species Trochocyathus aithoseptatus Cairns, 1984 Trochocyathus anglicus Duncan, 1872 Trochocyathus balanophylloides Bolsche, 1870 Trochocyathus burchae Cairns, 1984 Trochocyathus gardineri Vaughan, 1907 Trochocyathus mauiensis Vaughan, 1907 Trochocyathus oahensis Vaughan, 1907 Trochocyathus patelliformis Cairns, 1999 Trochocyathus rhombocolumna Alcock, 1902 Trochocyathus wilkinsoni Dennant, 1904
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