Classification of Okulitch 1950
Fm. †Archaeocyathidae Taylor 1910
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G. †Araneocyathus Vologdin 1937
G. †Archaeocyathus Billings 1861
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†Archaeocyathus atlanticus Billings 1861
Invalid names: Flindersicyathus Bedford and Bedford 1937 [synonym], Retecyathus Vologdin 1932 [synonym], Spirocyathus [synonym]
G. †Archaeopharetra
G. †Copleicyathus
G. †Protopharetra Bornemann 1884
Fm. †Pycnoidocyathidae Okulitch 1950
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G. †Ardrossacyathus
G. †Loculicyathus
G. †Metethmophyllum Okulitch 1943
G. †Paranacyathus
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Invalid names: Paracyathus Edwards and Haime 1848 [synonym], Spirocyathella Vologdin 1939 [synonym]
G. †Pycnoidocyathus Taylor 1910
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†Pycnoidocyathus amourensis Okulitch 1943
†Pycnoidocyathus ceratodictyoides Raymond 1931
†Pycnoidocyathus synapticulosus Taylor 1910
Invalid names: Cambrocyathus Okulitch 1937 [synonym]
G. †Sibirecyathus Vologdin 1937
Invalid names: Cambrocyathidae Okulitch 1943 [replaced]