Between brackets is the number of accepted species

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- Mollusca (132 791)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (25 009)
- Subclass Autobranchia (23 295)
- Infraclass Heteroconchia (16 637)
- Subterclass Archiheterodonta (1 208)
- Subterclass Euheterodonta (11 356)
- Subterclass Heterodonta
- Subterclass Palaeoheterodonta (4 072)
- Order Trigoniida (1 482)
- Superfamily Megatrigonioidea van Hoepen, 1929 † (336)
- Superfamily Myophorelloidea T. Kobayashi, 1954 † (376)
- Superfamily Pseudocardinioidea Martinson, 1961 † (176)
- Superfamily Trigonioidea Lamarck, 1819 (350)
- Superfamily Trigonioidoidea L. R. Cox, 1952 † (226)
- Family Nakamuranaiadidae F.-X. Guo, 1981 † (21)
- Family Nippononaiidae J.-H. Chen, 1987 † (41)
- Family Plicatounionidae J.-H. Chen, 1987 † (27)
- Genus Equiplicatounio J.-H. Chen, 1987 † accepted as Plicatounio (Equiplicatounio) J.-H. Chen, 1987 †
- Genus Kwanmonia Ota, 1963 † accepted as Plicatounio (Kwanmonia) Ota, 1963 †
- Genus Lioplicatounio Q.-H. Ma, 1983 † accepted as Plicatounio (Plicatounio) T. Kobayashi & K. Suzuki, 1936 †
- Genus Monginella Starobogatov, 1970 † (5)
- Genus Plicatounio T. Kobayashi & K. Suzuki, 1936 † (22)
- Subgenus Plicatounio (Acclinoplicatounio) Q.-H. Ma & B.-Y. Huang, 1979 † represented as Plicatounio T. Kobayashi & K. Suzuki, 1936 †
- Subgenus Plicatounio (Enotrigonioides) F.-X. Guo, 1987 † accepted as Nakamuranaia (Enotrigonioides) F.-X. Guo, 1987 †
- Subgenus Plicatounio (Entotrigonioides) [sic] † accepted as Nakamuranaia (Enotrigonioides) F.-X. Guo, 1987 †
- Subgenus Plicatounio (Equiplicatounio) J.-H. Chen, 1987 † represented as Plicatounio T. Kobayashi & K. Suzuki, 1936 †
- Subgenus Plicatounio (Guangxiconcha) P.-Y. Yao & J.-S. Yu, 1986 † accepted as Plicatounio (Plicatounio) T. Kobayashi & K. Suzuki, 1936 †
- Subgenus Plicatounio (Guangxiplicatounio) Z.-J. Fang, 2007 † accepted as Plicatounio (Plicatounio) T. Kobayashi & K. Suzuki, 1936 †
- Subgenus Plicatounio (Kwanmonia) Ota, 1963 † represented as Plicatounio T. Kobayashi & K. Suzuki, 1936 †
- Species Plicatounio (Kwanmonia) heilongjiangensis Z.-W. Gu, 1976 † accepted as Pseudohyria heilongjiangensis (Z.-W. Gu, 1976) †
- Species Plicatounio (Kwanmonia) kwanmonensis Ota, 1959 † represented as Plicatounio kwanmonensis Ota, 1959 †
- Subgenus Plicatounio (Latiplicatounio) Sha & Fürsich, 1993 † accepted as Plicatounio (Equiplicatounio) J.-H. Chen, 1987 †
- Subgenus Plicatounio (Lioplicatounio) Q.-H. Ma, 1983 † accepted as Plicatounio T. Kobayashi & K. Suzuki, 1936 †
- Subgenus Plicatounio (Monginella) Starobogatov, 1970 † accepted as Monginella Starobogatov, 1970 †
- Subgenus Plicatounio (Plicatounio) T. Kobayashi & K. Suzuki, 1936 † represented as Plicatounio T. Kobayashi & K. Suzuki, 1936 †
- Subgenus Plicatounio (Rongxiania) X.-Z. Liu, 1984 † accepted as Plicatounio (Plicatounio) T. Kobayashi & K. Suzuki, 1936 †
- Subgenus Plicatounio (Tamuraia) F.-X. Guo, 1987 † accepted as Plicatounio (Acclinoplicatounio) Q.-H. Ma & B.-Y. Huang, 1979 †
- Species Plicatounio altiplicatus Z.-W. Gu, 1999 †
- Species Plicatounio curtus B.-D. Shi, 1982 †
- Species Plicatounio equiplicatus Z.-W. Gu & J.-S. Yu, 1976 †
- Species Plicatounio flattersensis Mongin, 1963 † accepted as Monginella flattersensis (Mongin, 1963) †
- Species Plicatounio fujianensis Z.-W. Gu & Q.-H. Ma, 1976 †
- Species Plicatounio heilongjiangensis Z.-W. Gu, 1976 † accepted as Pseudohyria heilongjiangensis (Z.-W. Gu, 1976) †
- Species Plicatounio hengdongensis R.-J. Zhang, 1979 †
- Species Plicatounio hunanensis R.-J. Zhang, 1979 †
- Species Plicatounio klaudziensis Martinson, 1965 † accepted as Plicatounio (Plicatounio) hunanensis R.-J. Zhang, 1979 †
- Species Plicatounio kobayashii Maeda, 1962 † accepted as Plicatounio naktongensis T. Kobayashi & K. Suzuki, 1936 †
- Species Plicatounio kwanmonensis Ota, 1959 †
- Species Plicatounio latiplicatus Z.-W. Gu & J.-S. Yu, 1976 †
- Species Plicatounio manchuricus Yabe & Hayasi, 1937 †
- Species Plicatounio maxima Hoffet, 1937 † accepted as Plicatounio (Plicatounio) suzuki Hoffet, 1937 †
- Species Plicatounio multiplicatus K. Suzuki, 1943 † accepted as Plicatounio naktongensis T. Kobayashi & K. Suzuki, 1936 †
- Species Plicatounio naktongensis T. Kobayashi & K. Suzuki, 1936 †
- Species Plicatounio namphungensis T. Kobayashi, 1968 †
- Species Plicatounio nananensis Q.-H. Ma & B.-Y. Huang, 1979 †
- Species Plicatounio nomphungensis [sic] † accepted as Plicatounio namphungensis T. Kobayashi, 1968 †
- Species Plicatounio okjuni S.-Y. Yang †
- Species Plicatounio radieri Goumard, 1956 † accepted as Monginella radieri (Goumard, 1956) †
- Species Plicatounio rariplicatus F.-X. Guo, 1987 †
- Species Plicatounio rongxianensis X.-Z. Liu, 1984 †
- Species Plicatounio subrhombicus (Z.-W. Gu & J.-S. Yu, 1976) †
- Species Plicatounio supermultiplicatus B.-L. Ding, 1982 †
- Species Plicatounio suzuki Hoffet, 1937 †
- Species Plicatounio tamurai F.-X. Guo, 1987 †
- Species Plicatounio tetoriensis Maeda, 1962 † accepted as Plicatounio naktongensis T. Kobayashi & K. Suzuki, 1936 †
- Species Plicatounio triangularis T. Kobayashi & K. Suzuki, 1936 †
- Species Plicatounio versilini Martinson, 1990 † accepted as Plicatounio (Plicatounio) hunanensis R.-J. Zhang, 1979 †
- Species Plicatounio yooni S.-Y. Yang, 1989 † accepted as Plicatounio (Plicatounio) multiplicatus K. Suzuki, 1943 †
- Species Plicatounio zhejiangensis (Q.-H. Ma, 1989) †
- Species Plicatounio zhejiangensis Z.-W. Gu & Q.-H. Ma, 1976 †
- Species Plicatounio zhuchengensis Q.-H. Ma, 1983 †
- Genus Protounio Martinson, 1953 † accepted as Pseudohyria (Pseudohyria) MacNeil, 1936 †
- Genus Rongxiania X.-Z. Liu, 1984 † accepted as Plicatounio (Plicatounio) T. Kobayashi & K. Suzuki, 1936 †
- Family Pseudohyriidae T. Kobayashi, 1968 † (76)
- Family Sainschandiidae C. M. Kolesnikov, 1977 † accepted as Pseudohyriidae T. Kobayashi, 1968 †
- Family Sainshandiidae [sic] † accepted as Pseudohyriidae T. Kobayashi, 1968 †
- Family Trigonioididae L. R. Cox, 1952 † (56)
- Genus Blanfordinaia Starobogatov, 1970 † (1)
- Genus Indobaphia Starobogatov, 1970 † (1)
- Genus Monginellopsis V. R. Silva et al., 2020 † (1)
- Genus Repmania C. M. Kolesnikov, 1980 † accepted as Repmanigonia Ceccolini & Cianferoni, 2021 †
- Genus Repmanigonia Ceccolini & Cianferoni, 2021 † (2)
- Superfamily Trigonodoidea Modell, 1942 † (18)
- Order Unionida (2 579)
- Family Lyrodesmatidae P. Fischer, 1886 † (8)
- Family Pseudarcidae Scarlato & Starobogatov, 1979 † (3)
- Family Thoraliidae N. J. Morris, 1980 †
- Superorder Heteroconchia incertae sedis † (1)
- Infraclass Pteriomorphia (6 658)
- Subclass Bivalvia incertae sedis (7)
- Subclass Palaeotaxodonta accepted as Nuculida
- Subclass Paleoheterodonta accepted as Palaeoheterodonta
- Subclass Protobranchia (1 365)
- Infraclass Cryptodonta † (342)
- Class Caudofoveata (143)
- Class Cephalopoda (1 834)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (102 697)
- 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