Classification of Bentson 1943
G. Platytrochus Milne-Edwards and Haime 1848
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†Platytrochus merriami Nomland 1916
G. Trochocyathus Milne-Edwards and Haime 1848
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†Trochocyathus crooki Merriam and Turner 1937
†Trochocyathus imperialis Nomland 1916
†Trochocyathus nomlandi Bentson 1943