Classification of Frest et al. 2011
G. †Holocystites Hall 1864
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Subg. †Holocystites (Megacystites) Frest et al. 2011
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†Holocystites (Megacystites) abnormis Hall 1864
†Holocystites (Megacystites) greenvillensis Foerste 1917
Subg. †Holocystites (Sepulticystis) Frest et al. 2011
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†Holocystites (Sepulticystis) spangleri Miller 1891
Fm. †Holocystitidae Miller 1889
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Invalid names: Trematocystinae Frest and Strimple 2011 [empty]
Subg. †Holocystites (Holocystites) Hall 1864
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†Holocystites (Holocystites) alternatus Hall 1861
†Holocystites (Holocystites) cylindricus Hall 1861