Subclass, order, superfamily incertae sedis - Family †Archaeocarduudae
- Family †Camyidae
- Family †Cardiolariidae
- Family †Cirravidae
- Family †Fordillidae
- Family †Laurskiidae
- Family †Thoraliidae
- Family †Tuarangiidae
Clade Heterodonta Order and superfamily incertae sedis - Family †Anodontopsidae
- Family †Baidiostracidae
- Family †Carydiidae
- Family †Intihuarellidae
- Family †Lyrodesmatidae
- Family †Montanariidae
- Family †Nyassidae
- Family †Pseudarcidae
- Family †Redoniidae
- Family †Tanaodontidae
- Family †Zadimerodiidae
Order incertae sedis - Superfamily †Anthracosioidea
- Family †Anthracosiidae
- Family †Carbonicolidae
- Family †Opokiellidae
- Family Priukiellidae
- Family †Shaanxiconchidae
- Family †Sinomyidae
- Superfamily Gastrochaenoidea
- Superfamily Hiatelloidea
- Superfamily †Kalenteroidea
- Superfamily †Modiomorphoidea
- Family †Cypricardiniidae
- Family †Hippopodiumidae
- Family †Modiomorphidae
- Family †Palaeopharidae
- Family †Tusayanidae
- Superfamily Solenoidea
Order †Actinodontida - Superfamily †Cycloconchoidea
- Superfamily †Radiolitoidea
- Family †Antillocaprinidae
- Family †Caprinidae
- Family †Caprinulidae
- Family †Caprotinidae
- Family †Diceratidae
- Family †Hippuritidae
- Family †Ichthyosarcolitidae
- Family †Monopleuridae
- Family †Plagioptychidae
- Family †Radiolitidae
- Family †Techmanellidae
- Superfamily †Requienioidea
- Superfamily †Babinkoidea
- Family †Babinkidae
- Family †Coxiconchiidae
- Superfamily Lucinoidea
- Family Lucinidae
- Family †Mactromyidae
- Family †Paracyclidae
- Superfamily Thyasiroidea
- Superfamily Myoidea
- Superfamily Pholadoidea
Order †Orthonotida - Superfamily †Orthonotoidea
- Family †Konduriidae
- Family †Orthonotidae
- Family †Prothyridae
- Family †Solenomorphidae
- Superfamily incertae sedis
- Superfamily Ceratomyoidea
- Superfamily Clavagelloidea
- Superfamily †Edmondioidea
- Superfamily Myochamoidea
- Superfamily Pandoroidea
- Superfamily Pholadomyoidea
- Family †Burmesiidae
- Family †Ceratomyopsidae
- Family †Grammysiidae
- Family †Margaritariidae
- Family Parilimyidae
- Family Pholadomyidae
- Family †Pleuromyidae
- Family †Sanguinolitidae
- Superfamily Thracioidea
- Clade Septibranchia (within Pholadomyida)
- Superfamily incertae sedis
- Superfamily Arcticoidea
- Family Arcticidae
- Family† Euloxidae
- Family †Isocyprinidae
- Family †Pollicidae
- Family Trapezidae
- Family †Veniellidae
- Superfamily Cardioidea
- Superfamily Chamoidea
- Superfamily Cyamioidea
- Superfamily Cyrenoidea
- Superfamily Cyrenoidoidea
- Superfamily Dreissenoidea
- Superfamily Gaimardioidea
- Superfamily Galeommatoidea
- Superfamily Glossoidea
- Superfamily Mactroidea
- Superfamily Sphaerioidea
- Family †Ferganoconchidae
- Family †Kijidae
- Family †Limnocyrenidae
- Family †Neomiodontidae
- Family †Pseudocardiniidae
- Family †Sibireconchidae
- Family Sphaeriidae
- Superfamily Tellinoidea
- Superfamily Ungulinoidea
- Superfamily Veneroidea
†"Megalodonts" - Family †Congeriomorphidae
- Family †Dicerocardiidae
- Family †Mecynodontidae
- Family †Megalodontidae
- Family †Pachyrismatidae
- Family †Plethocardiidae
- Family †Wallowaconchidae
| - Superfamily †Beichuanioidea Liu & Gu, 1988
- Family †Beichuaniidae Liu & Gu, 1988
- Superfamily †Megatrigonioidea Van Hoepen, 1929
- Family †Iotrigoniidae Savelive, 1958
- Family †Megatrigoniidae Van Hoepen, 1929
- Family †Rutitrigoniidae Van Hoepen, 1929
- Superfamily Myophorelloidea Kobayashi, 1954
- Family †Buchotrigoniidae Leanza, 1993
- Family †Laevitrigoniidae Savelive, 1958
- Family †Myophorellidae Kobayashi, 1954
- Family †Vaugoniidae Kobayashi, 1954
- Superfamily Trigonioidea Lamarck, 1819
- Family †Eoschizodidae Newell & Boyd, 1975 (syn: Curtonotidae)
- Family †Groeberellidae Pérez, Reyes, & Danborenea 1995
- Family †Myophoriidae Bronn, 1849 (syn: Cytherodontidae, Costatoriidae, Gruenewaldiidae)
- Family †Prosogyrotrigoniidae Kobayashi, 1954
- Family †Scaphellinidae Newell & Ciriacks, 1962
- Family †Schizodidae Newell & Boyd, 1975
- Family †Sinodoridae Pojeta & Zhang, 1984
- Family Trigoniidae Lamarck, 1819
- Superfamily †Archanodontoidea Modell, 1957 (placement in Unionoida uncertain)
- Family †Archanodontidae Modell, 1957
- Superfamily incertae sedis
- Family †Desertellidae
- Family †Trigonodidae
- Family †Utschamiellidae
- Superfamily Etherioidea Deshayes, 1832
- Superfamily Hyrioidea Swainson, 1840
- Superfamily †Trigonioidoidea Cox, 1952
- Family †Jilinoconchidae Ma, 1989 (placement uncertain)
- Family †Nakamuranaiadidae Guo, 1981 (syn:Sinonaiinae, Nippononaiidae)
- Family †Plicatounionidae Chen, 1988
- Family †Pseudohyriidae Kobayashi, 1968
- Family †Sainschandiidae Kolesnikov, 1977
- Family †Trigonioididae Cox, 1952
- Superfamily Unionoidea Rafinesque, 1820
- Family Liaoningiidae Yu & Dong, 1993 (placement uncertain)
- Family Margaritiferidae Henderson, 1929 (syn:Margaritaninae, Cumberlandiinae, Promargaritiferidae)
- Family †Sancticarolitidae Simone & Mezzalira, 1997
- Family Unionidae Rafinesque, 1820
Order and superfamily incertae sedis - Family †Afghanodesmatidae
- Family †Antactinodiontidae
- Family †Ctenodontidae
- Family †Eritropidae
- Family †Pseudocryrtodontidae
- Family †Tironuculidae
- Superfamily Manzanelloidea
- Superfamily Solemyoidea
Subclass Autobranchia Superorder, order and superfamily incertae sedis - Family †Cercomyidae
- Family †Palaeocardiidae
- Family †Pucamyidae
Order incertae sedis - Family †Amnigeniidae
- Family †Lipanellidae
- Family †Palaeomutelidae
Superorder Nepiomorphia Order †Antipleurida - Superfamily †Dualinoidea
- Family †Dualinidae
- Family †Spanilidae
- Family †Stolidotidae
- Superfamily †Praecardioidea
- Family †Buchiolidae
- Family †Praecardiidae
- Superfamily †Cardioloidea
- Family †Cardiolidae
- Family †Slavidae
Order and superfamily incertae sedis - Family †Eligmidae
- Family †Evyanidae
- Family †Ischyrodontidae
- Family †Limatulinidae
- Family †Matheriidae
- Family †Myodakryotidae
- Family †Pichleridae
- Family †Rhombopteriidae
- Superfamily incertae sedis
- Superfamily Arcoidea
- Superfamily Limopsoidea
Order Cyrtodontida - Superfamily †Cyrtodontoidea
- Family †Cyrtodontidae
- Family †Ptychodesmatidae
- Superfamily †Falcatodontoidea
- Superfamily †Modiolopsoidea
- Family †Colpomyidae
- Family †Modiolopsidae
- Family †Saffordiidae
- Superfamily Mytiloidea
- Superfamily incertae sedis
- Family †Euchondriidae
- Family †Praeostreidae
- Family †Prospondylidae
- Family †Saharopteriidae
- Family †Vlastidae
- Superfamily Anomioidea
- Superfamily †Aulacomyelloidea
- Family †Aulacomyellidae
- Family †Bositridae
- Superfamily †Aviculopectinoidea
- Family †Aviculopectinidae
- Family †Deltopectinidae
- Superfamily †Buchioidea
- Family †Buchiidae
- Family †Eurydesmatidae
- Superfamily †Chaenocardioidea
- Family †Chaenocardiidae
- Family †Binipectinidae
- Family †Streblochondriidae
- Superfamily Dimyoidea
- Superfamily †Heteropectinoidea
- Family †Acanthopectinidae
- Family †Annuliconchidae
- Family †Heteropectinidae
- Family †Limpectinidae
- Superfamily †Halobioidea
- Family †Claraiidae
- Family †Daonellidae
- Family †Halobiidae
- Superfamily †Leiopectinoidea
- Superfamily †Monotoidea
- Family †Dolponellidae
- Family †Monotidae
- Superfamily †Oxytomoidea
- Family †Otapiriidae
- Family †Oxytomidae
- Superfamily Pectinoidea
- Superfamily Plicatuloidea
- Superfamily †Pseudomonotoidea
- Family †Hunanopectinidae
- Family †Pseudomonotidae
- Family †Terquemiidae
- Superfamily †Pterinopectinoidea
- Family †Natalissimidae
- Family †Pterinopectinidae
- Superfamily †Ambonychioidea
- Family †Ambonychiidae
- Family †Abiellidae
- Family †Alatoconchidae
- Family †Inoceramidae
- Family †Kinerkaellidae
- Family †Lunulacardiidae
- Family †Lunulacardiidae
- Family †Manticulidae
- Family †Monopteriidae
- Family †Myalinidae
- Family †Prokopievskiidae
- Family †Ramonalinidae
- Superfamily Pinnoidea
- Superfamily Pterioidea
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