Classification of the genus Plicocyathus
G. †Plicocyathus Vologdin 1960
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†Plicocyathus torosus Osadchaya et al. 1979
Invalid names: Torosocyathellus Osadchaya et al. 1979 [synonym], Tumulocyathellus Zhuravleva 1960 [synonym]