Between brackets is the number of accepted species

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- Mollusca (132 888)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (25 022)
- Subclass Autobranchia (23 308)
- Subclass Bivalvia incertae sedis (7)
- Subclass Palaeotaxodonta accepted as Nuculida
- Subclass Paleoheterodonta accepted as Palaeoheterodonta
- Subclass Protobranchia (1 365)
- Order Afghanodesmatida † (17)
- Order Manzanellida (40)
- Order Nuculanida (856)
- Order Nuculida (359)
- Superfamily Nuculoidea Gray, 1824 (359)
- Family Nuculidae J. E. Gray, 1824 (334)
- Subfamily Nuculominae P. A. Maxwell, 1988 accepted as Nuculidae J. E. Gray, 1824
- Genus Acila H. Adams & A. Adams, 1858 (28)
- Genus Austronucula A. W. B. Powell, 1939 (7)
- Genus Brevinucula Thiele, 1934 (2)
- Genus Condylonucula D. R. Moore, 1977 (3)
- Genus Dacryomya Agassiz, 1840 † (3)
- Genus Deminucula Iredale, 1931 accepted as Nucula Lamarck, 1799
- Genus Ennucula Iredale, 1931 (60)
- Genus Eonuculoma Klug, Kröger, Korn, Rücklin, Schemm-Gregory, de Baets & Mapes, 2008 † (1)
- Species Eonuculoma babini Klug, Kröger, Korn, Rücklin, Schemm-Gregory, de Baets & Mapes, 2008 †
- Genus Gibbonucula Eames, 1951 † (1)
- Genus Habonucula C. S. P. Singh & Kanjilal, 1977 † accepted as Nuculoma Cossmann, 1907 †
- Genus Iheringinucula del Río & Camacho, 1996 † (2)
- Genus Lacia Slodkewitsch, 1967 † (6)
- Genus Lamellinucula Schenck, 1944 accepted as Nucula (Lamellinucula) Schenck, 1944 (4)
- Genus Leionucula Quenstedt, 1930 † (19)
- Genus Linucula Marwick, 1931 (13)
- Genus Lionucula Thiele, 1934 accepted as Leionucula Quenstedt, 1930 †
- Genus Lissanucula Woodring, 1973 † (1)
- Genus Neonucula T. C. Lan & Y.-C. Lee, 2001 (1)
- Genus Nucula Lamarck, 1799 (134)
- Genus Nuculoidea H. S. Williams & Breger, 1916 † (9)
- Genus Nuculoma Cossmann, 1907 † (7)
- Genus Nuculopsis Woodring, 1925 † accepted as Lissanucula Woodring, 1973 †
- Genus Nuculopsis Girty, 1911 † (2)
- Genus Palaeonucula W. Quenstedt, 1930 † (9)
- Genus Polyodonta Megerle von Mühlfeld, 1811 accepted as Nucula Lamarck, 1799
- Genus Praeleda Pfab, 1934 † (3)
- Genus Pronucula Hedley, 1902 (14)
- Genus Quadratonucula Dickins, 1963 †
- Genus Rumptunucula Bergmans, 1978 accepted as Nucula (Rumptunucula) Bergmans, 1978
- Genus Similoconcha R.-J. Zhang, 1977 † (1)
- Genus Sinonucula F.-S. Xu, 1985 (1)
- Genus Trigonucula Ichikawa, 1949 †
- Genus Varinucula P. A. Maxwell, 1988 (3)
- Family Praenuculidae McAlester, 1969 † (25)
- Order Protobranchia incertae sedis † (4)
- Order Solemyida (89)
- Infraclass Cryptodonta † (342)
- Class Caudofoveata (143)
- Class Cephalopoda (1 838)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (102 777)
- Class Lamellibranchiata accepted as Bivalvia
- Class Loricata accepted as Polyplacophora
- Class Mollusca incertae sedis † (372)
- Class Monoplacophora (229)
- Class Pelecypoda accepted as Bivalvia
- Class Polyplacophora (1 377)
- Class Polyplaxiphora accepted as Polyplacophora
- Class Rostroconchia † (64)
- Class Scaphopoda (752)
- Class Solenoconchia accepted as Scaphopoda
- Class Solenogastres (313)
- Subclass Chaetodermomorpha accepted as Caudofoveata