Classification of Handfield 1971

G. †Cordilleracyathus Handfield 1971
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Cordilleracyathus blussoni Handfield 1971
G. †Erismacoscinus Debrenne 1958
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Erismacoscinus uniporus Handfield 1971
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Ladaecyathus fischeri Handfield 1971
G. †Sekwicyathus Handfield 1971
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Sekwicyathus nahanniensis Handfield 1971
G. †Yukonocyathus Handfield 1971
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Yukonocyathus francesi Handfield 1971
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Zonacyathus borealis Handfield 1971
Zonacyathus princetonensis Handfield 1971
G. †Coscinocyathus Bornemann 1884
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Coscinocyathus fritzi Handfield 1971
G. †Fenestrocyathus Handfield 1971
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Fenestrocyathus complexus Handfield 1971
G. †Flindersicyathus Bedford and Bedford 1937
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Flindersicyathus mcdamensis Handfield 1971