Classification of Okulitch 1954

G. †Ajacicyathus Bedford and Bedford 1939
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†Ajacicyathus nevadensis Okulitch 1943
G. †Ethmophyllum Meek 1868
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†Ethmophyllum whitneyi Meek 1868
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†Syringocyathus inyoensis Okulitch 1954
G. †Archaeocyathus Billings 1861
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†Archaeocyathus arborensis Okulitch 1954
†Archaeocyathus atlanticus Billings 1861
G. †Pycnoidocyathus Taylor 1910
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Subg. †Pycnoidocyathus (Cambrocyathus) Okulitch 1937