Phylum Mollusca Linnaeus, 1758 - molluscs
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   Conchifera Gegenbaur, 1878 see Subphylum Conchifera Gegenbauer, 1878
  Count: -
     Cyrtosoma
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       Class Gastropoda Cuvier, 1795 - snails and slugs
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         Subclass †Archaeobranchia Parkhaev, 2001
        Count: [†g] †2o;8f;67g
           Order †Pelagielliformes Runnegar & Pojeta, 1985
          Count: [†g] †2f;5g
             Family †Pelagiellidae Knight, 1952
            Count: [†g] †3g
               1 Genus †Costipelagiella Horný, 1964
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               2 Genus †Pelagiella Matthew, 1895
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               3 Genus †Tannuspira Missarjevsky, 1989
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