Classification of the genus Tribrachyocrinus
G. †Tribrachyocrinus M'Coy 1847
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†Tribrachyocrinus brogerensis Willink 1979
†Tribrachyocrinus clarkei M'Coy 1847
†Tribrachyocrinus corrugatus Ratte 1885
†Tribrachyocrinus etheridgei Willink 1979
†Tribrachyocrinus granulatus Etheridge Jr. 1892
†Tribrachyocrinus pseudoclarkei Willink 1979
†Tribrachyocrinus rattei Willink 1979
†Tribrachyocrinus singletonensis Willink 1979
Invalid names: Pentadia Dana 1847 [nomen dubium], Pentadia reniformis Dana 1847 [nomen dubium], Pentadia spatangus Dana 1847 [nomen dubium], Pentadia trigona Dana 1847 [nomen dubium]