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 Lyonsiidae Fischer, 1887
               1 Genus Lyonsia Turton, 1822
               2 Genus Agriodesma Dall, 1909
               3 Genus Allogramma Dall, 1903
               4 Genus Entodesma Philippi, 1845
               5 Genus Mytilimeria Conrad, 1837
               6 Genus Ostomya Conrad, 1874