Classification of the genus Cyathophycus
G. †Cyathophycus Walcott 1879
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†Cyathophycus akiensis Rigby et al. 1998
†Cyathophycus extendis Carrera and Ortega 2009
†Cyathophycus loydelli Botting 2004
†Cyathophycus mackenziensis Rigby and Chatterton 1994
†Cyathophycus pseudoreticulatus Rigby 1995
†Cyathophycus reticulatus Walcott 1879
Invalid names: Cyathodictya [nomen vanum], Cyathospongia Dawson and Hinde 1889 [nomen vanum]