| Stylommatophora (Order) |
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| Stylommatophora Helicoidea Rafinesque, 1815 (Superfamily) |
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| Xanthonychidae Strebel & Pfeffer, 1879 (Family) |
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| Xanthonychidae subfam. Epiphragmophorinae Hoffmann, 1928 (Subfamily) |
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| Xanthonychidae subfam. Lysinoinae Hoffmann, 1928 (Subfamily) |
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| Xanthonychidae subfam. Metrostracinae H. Nordsiek, 1987 (Subfamily) |
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| Xanthonychidae subfam. Trochodiscinae H. Nordsiek, 1987 (Subfamily) |
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| Xanthonychidae subfam. Xanthonychinae Strebel & Pfeffer, 1879 (Subfamily) |
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