living organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Superkingdom Eukaryotae see Domain Eukaryota Chatton, 1925
     Kingdom Animalia Linnaeus, 1758 - animals
       Subkingdom Eumetazoa Butschli, 1910 see [unranked] Eumetazoa Bütschli, 1910
         Phylum Mollusca Linnaeus, 1758 - molluscs
           Class Bivalvia Linnaeus, 1758 - bivalves
             Subclass Paleoheterodonta see Order Unionida Gray, 1854
               Order Unionoida see Order Unionida Gray, 1854
                 Superfamily Mutelacea see Superfamily Muteloidea Gray, 1847
                   Family Mycetopodidae Gray, 1840
                     Subfamily Monocondylaeinae Modell, 1942
                       1 Genus Monocondylaea d'Orbigny, 1835
                       2 Genus Fossula Lea, 1870
                       3 Genus Haasica Strand, 1932
                       4 Genus Tamsiella Haas, 1931