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
                       Genus Fossula Lea, 1870