Phylum Mollusca Linnaeus, 1758 - molluscs
   Class Gastropoda Cuvier, 1795 - snails and slugs
     Subclass Pulmonata Cuvier, 1814 [monotypic] - land snails and slugs see Order Pulmonata Cuvier, 1814
       Order Archaeopulmonata Morton, 1955 see Suborder Archaepulmonata
         Superfamily Ellobioidea Pfeiffer, 1854 (1822)
           Family Ellobiidae Pfeiffer, 1854 (1822)
             Subfamily Ellobiinae Pfeiffer, 1854 (1822)
               Genus Pythiopsis Sandberger, 1872
                 1 Subgenus Pythiopsis Sandberger, 1872
                 2 Subgenus Hemitaxia Sandberger, 1872