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)
- Superfamily Nuculanoidea H. Adams & A. Adams, 1858 (1854) (841)
- Family Adranidae Scarlato & Starobogatov, 1979 accepted as Nuculanidae H. Adams & A. Adams, 1858 (1854)
- Family Bathyspinulidae Coan & Valentich-Scott, 1997 (19)
- Family Cadomiidae Scarlato & Starobogatov, 1979 † (2)
- Family Cucullellidae P. Fischer, 1886 † (9)
- Family Glomidae A. E. Verrill & K. J. Bush, 1897 accepted as Pristiglomidae H. L. Sanders & J. A. Allen, 1973
- Family Isoarcidae Keen, 1969 † (6)
- Family Lametilidae J. A. Allen & H. L. Sanders, 1973 (2)
- Family Ledidae Gray, 1854 accepted as Nuculanidae H. Adams & A. Adams, 1858 (1854)
- Family Malletidae H. Adams & A. Adams, 1858 accepted as Malletiidae H. Adams & A. Adams, 1858 (1846)
- Family Malletiidae H. Adams & A. Adams, 1858 (1846) (155)
- Family Neilonellidae Schileyko, 1989 (53)
- Genus Austrotindaria C. A. Fleming, 1948 accepted as Neilonella Dall, 1881 (1)
- Genus Neilonella Dall, 1881 (37)
- Species Neilonella abyssopacifica Okutani & Kawamura, 2002
- Species Neilonella acinula (Dall, 1890) accepted as Ledella acinula (Dall, 1890)
- Species Neilonella aequata (Marwick, 1965) †
- Species Neilonella aequatorialis (Thiele, 1931)
- Species Neilonella alleni Amano & R. G. Jenkins, 2017 †
- Species Neilonella atossa (Dall, 1908) accepted as Pseudoneilonella atossa (Dall, 1908)
- Species Neilonella benthicola (Dell, 1956)
- Species Neilonella brunnea (Dall, 1916)
- Species Neilonella championi (A. H. Clarke, 1961)
- Species Neilonella coix Habe, 1951
- Species Neilonella corpulenta (Dall, 1881)
- Species Neilonella decipiens (E. A. Smith, 1885)
- Species Neilonella delicatula Prashad, 1932
- Species Neilonella dubia Prashad, 1932
- Species Neilonella erebus (A. H. Clarke, 1959)
- Species Neilonella flemingi (Dell, 1956)
- Species Neilonella galatheae Knudsen, 1970 accepted as Neilonella erebus (A. H. Clarke, 1959)
- Species Neilonella gibbsii (Dall, 1897)
- Species Neilonella guineensis (Thiele, 1931) accepted as Neilonella latior (Jeffreys, 1876)
- Species Neilonella hadalis Knudsen, 1970
- Species Neilonella hampsoni J. A. Allen & H. L. Sanders, 1996
- Species Neilonella indica (E. A. Smith, 1895)
- Species Neilonella japonica Okutani, 1962
- Species Neilonella kermadecensis Knudsen, 1970
- Species Neilonella kirai Habe, 1953
- Species Neilonella kuroshimaensis Okutani, 2011
- Species Neilonella latior (Jeffreys, 1876) accepted as Pseudoneilonella latior (Jeffreys, 1876)
- Species Neilonella lediformis (Thiele, 1931)
- Species Neilonella mawheraensis (P. A. Maxwell, 1988) †
- Species Neilonella menziesi A. H. Clarke, 1959 accepted as Katadesmia cuneata (Jeffreys, 1876)
- Species Neilonella mexicana (Dall, 1908)
- Species Neilonella nasuta (Marwick, 1931) † accepted as Austrotindaria nasuta (Marwick, 1931) †
- Species Neilonella politissima Okutani & Kawamura, 2002
- Species Neilonella profunda Okutani & Fujiwara, 2005
- Species Neilonella pusio (R. A. Philippi, 1844) † accepted as Pseudoneilonella pusio (R. A. Philippi, 1844) †
- Species Neilonella quadrangularis (Dall, 1881)
- Species Neilonella ritteri (Dall, 1916)
- Species Neilonella rodent (Okutani & Kawamura, 2002)
- Species Neilonella salicensis (G. Seguenza, 1877) accepted as Pseudoneilonella salicensis (G. Seguenza, 1877)
- Species Neilonella schepmani Prashad, 1932
- Species Neilonella sericea (Jeffreys, 1876) accepted as Tindaria sericea (Jeffreys, 1876)
- Species Neilonella siberutensis (Thiele, 1931) accepted as Tindaria siberutensis Thiele, 1931
- Species Neilonella similis (Okutani, 1962)
- Species Neilonella soyoae Habe, 1958
- Species Neilonella striolata (Brugnone, 1876) sensu Warén, 1989 accepted as Neilonella latior (Jeffreys, 1876)
- Species Neilonella subovata A. E. Verrill & K. J. Bush, 1897 accepted as Neilonella latior (Jeffreys, 1876)
- Species Neilonella sulculata (A. Gould, 1852)
- Species Neilonella sumatrensis (Thiele, 1931)
- Species Neilonella weberi Prashad, 1932 accepted as Tindaria siberutensis Thiele, 1931
- Species Neilonella whoii J. A. Allen & H. L. Sanders, 1996
- Species Neilonella wrighti (C. A. Fleming, 1948)
- Genus Pseudoneilonella Laghi, 1986 (7)
- Genus Pseudotindaria H. L. Sanders & J. A. Allen, 1977 accepted as Neilonella Dall, 1881 (8)
- Genus Saturnia G. Seguenza, 1877 accepted as Pseudoneilonella Laghi, 1986
- Family Nuculanidae H. Adams & A. Adams, 1858 (1854) (361)
- Family Phaseolidae Scarlato & Starobogatov, 1971 (2)
- Family Polidevciidae Kumpera, Prantl & Růžička, 1960 † (6)
- Family Poroledidae Scarlato & Starobogatov, 1979 accepted as Poroledinae Scarlato & Starobogatov, 1979
- Family Pristiglomidae H. L. Sanders & J. A. Allen, 1973 (3)
- Family Pseudocyrtodontidae Maillieux, 1939 † (2)
- Family Radiidentidae Egorova & Starobogatov, 1975 accepted as Siliculidae J. A. Allen & H. L. Sanders, 1973
- Family Saturniidae J. A. Allen & F. Hannah, 1986 accepted as Neilonellidae Schileyko, 1989
- Family Siliculidae J. A. Allen & H. L. Sanders, 1973 (7)
- Family Solenellidae A. d'Orbigny, 1846 accepted as Malletiidae H. Adams & A. Adams, 1858 (1846)
- Family Spinulidae J. A. Allen & H. L. Sanders, 1982 accepted as Ledellinae J. A. Allen & H. L. Sanders, 1982
- Family Strabidae Prantl & Růžička, 1954 † (5)
- Family Tindariidae A. E. Verrill & K. J. Bush, 1897 (28)
- Family Yoldiidae Dall, 1908 (181)
- Family Zealedidae Scarlato & Starobogatov, 1979 accepted as Ledellinae J. A. Allen & H. L. Sanders, 1982
- Superfamily Pristiglomoidea H. L. Sanders & J. A. Allen, 1973 accepted as Nuculanoidea H. Adams & A. Adams, 1858 (1854)
- Superfamily Sareptoidea Stoliczka, 1870 (15)
- Order Nuculida (359)
- 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