Classification of Frest et al. 1999

G. †Bucanopsis Ulrich and Scofield 1897
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Bucanopsis patersoni Hall 1862
G. †Naticonema Perner 1903
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Naticonema plebium Perner 1903
G. †Platyostoma Conrad 1842
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Platyostoma clintonensis Foerste 1909
Platyostoma plebium Hall 1876
Subg. †Loxoplocus (Lophospira) Whitfield 1886
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Loxoplocus (Lophospira) depauperata Hall and Whitney 1862
Subg. †Bucanella (Bucanella) Meek 1871
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Subg. †Holocystites (Megacystites) Frest et al. 2011
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