[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Phylum Mollusca Linnaeus, 1758 - molluscs
     Class Gastropoda Cuvier, 1795 - snails and slugs
       Family Retusidae Thiele, 1925
         1 Genus Retusa Brown, 1827
         2 Genus Relichna Rudman, 1971
         3 Genus Cylichnina Monterosato, 1884
         4 Genus Pyrunculus Pilsbry, 1895
         5 Genus Volvulella Newton, 1891