Classification of Frest et al. 1999
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. †Amphistrophiella (Amsdenostrophiella) Harper and Boucot 1978
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†Amphistrophiella (Amsdenostrophiella) prolongata Foerste 1909
Subg. †Holocystites (Megacystites) Frest et al. 2011
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†Holocystites (Megacystites) abnormalis Hall 1864