Kingdom Animalia Linnaeus, 1758 - animals
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   Phylum Mollusca Linnaeus, 1758 - molluscs
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     Subphylum Diasoma Runnegar & Pojeta Jr., 1974 see Phylum Mollusca Linnaeus, 1758
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       Class †Rostroconchia Pojeta et al., 1972
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         Order †Ribeirioida Kobayashi, 1933
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           Genus †Tolmachovia Howell & Kobayashi, 1936
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