Phylum Mollusca Linnaeus, 1758 - molluscs
   Class Bivalvia Linnaeus, 1758 - bivalves
     Subclass Anomalodesmata Dall, 1889 [monotypic] see Order Anomalodesmata Dall, 1889
       Order Pholadomyida Newell, 1965
         Suborder Pholadomyina Newell, 1965 see Order Pholadomyida Newell, 1965
           Superfamily Pandoroidea Rafinesque, 1815
             Family Periplomatidae Dall, 1895
               Genus Periploma Schumacher, 1817
                 1 Subgenus Albimanus Pilsbry & Olsson, 1935
                 2 Subgenus Offadesma Iredale, 1930
                 3 Subgenus Pendaloma Iredale, 1930