Classification of Dennant 1904
G. Balanophyllia Wood 1844
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†Balanophyllia basedowi Dennant 1904
†Balanophyllia cauliculata Dennant 1904
†Balanophyllia fossata Dennant 1904
†Balanophyllia induta Dennant 1904
†Balanophyllia patula Dennant 1904
†Balanophyllia torta Dennant 1904
†Balanophyllia truncata Dennant 1904
G. †Conosmilia Duncan 1865
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†Conosmilia granulata Dennant 1904
†Conosmilia stylifera Dennant 1904
G. Deltocyathus Milne-Edwards and Haime 1848
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†Deltocyathus fontinalis Dennant 1904
†Deltocyathus stellaris Dennant 1904
†Deltocyathus verconis Dennant 1904
G. Flabellum Lesson 1831
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†Flabellum grangense Dennant 1904
†Flabellum medioplicatum Dennant 1904
†Flabellum microscriptum Dennant 1904
G. †Leptocyathus Milne-Edwards and Haime 1850
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†Leptocyathus convexus Dennant 1904
G. Parasmilia Milne-Edwards and Haime 1848
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†Parasmilia flindersensis Dennant 1904
†Parasmilia lucens Dennant 1904
G. Platytrochus Milne-Edwards and Haime 1848
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†Platytrochus maudensis Dennant 1904
G. Trochocyathus Milne-Edwards and Haime 1848
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†Trochocyathus wilkinsoni Dennant 1904
G. Bathyactis Moseley 1881
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†Bathyactis beaumariensis Dennant 1904
†Bathyactis excelsa Dennant 1904