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 Pteriomorphia Beurlen, 1944 see Superorder Pteriomorphia Beurlen, 1944
               Superorder Eupteriomorphia Boss, 1982 see Superorder Filibranchia
                 Order Ostreoida Férussac, 1822 see Order Ostreida Férussac, 1822
                   Suborder Pectinina Gray, 1854 see Order Pectinida Gray, 1854
                     Superfamily Pectinacea Rafinesque, 1815, nom. illeg. see Superfamily Pectinoidea Rafinesque, 1815
                       1 Family Pectinidae Rafinesque, 1815 - scallops
                       2 Family Spondylidae Gray, 1826 - thorny oysters
                       3 Family Syncyclonemidae Waller, 1978, orth. inval. see Family Syncyclonematidae Waller, 1978
                       4 Family Propeamussiidae Abbott, 1954