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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)
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)
Subfamily Danlengiconchinae J.-G. Sha, 1993 † (8)
Subfamily Peregrinoconchinae Z.-W. Gu, J.-H. Chen & X. Lan, 1976 † (14)
Subfamily Trigonioidinae L. R. Cox, 1952 † (33)
Genus Fujianotrigonioides Z.-W. Gu & Sha, 1981 † accepted as Trigonioides (Kumamotoa) S.-Y. Yang, 1974 †
Genus Hoffetrigonia K. Suzuki, 1940 † accepted as Trigonioides (Kumamotoa) S.-Y. Yang, 1974 †
Genus Iberanaia Delvene & Munt, 2011 † (1)
Genus Koreanaia S.-Y. Yang, 1976 † accepted as Trigonioides (Koreanaia) S.-Y. Yang, 1976 † (1)
Genus Trigonioides T. Kobayashi & K. Suzuki, 1936 † (31)
Subgenus Trigonioides (Didymotrigonioides) Z.-W. Gu, 1976 † accepted as Trigonioides (Trigonioides) T. Kobayashi & K. Suzuki, 1936 †
Subgenus Trigonioides (Diversitrigonioides) Z.-W. Gu, 1976 † accepted as Diversitrigonioides Z.-W. Gu, 1976 †
Subgenus Trigonioides (Fujianotrigonioides) Z.-W. Gu & J.-G. Sha, 1981 †
Subgenus Trigonioides (Koreanaia) S.-Y. Yang, 1976 † represented as Trigonioides T. Kobayashi & K. Suzuki, 1936 †
Subgenus Trigonioides (Kumamotoa) S.-Y. Yang, 1974 † represented as Trigonioides T. Kobayashi & K. Suzuki, 1936 †
Subgenus Trigonioides (Laotrigonioides) T. Kobayashi, 1968 † accepted as Trigonioides (Trigonioides) T. Kobayashi & K. Suzuki, 1936 †
Subgenus Trigonioides (Mekongiconcha) T. Kobayashi, 1968 † represented as Trigonioides T. Kobayashi & K. Suzuki, 1936 †
Species Trigonioides (Mekongiconcha) bisinuatus (Mansuy, 1912) † represented as Trigonioides bisinuatus (Mansuy, 1912) †
Species Trigonioides (Mekongiconcha) subquadratus (T. Kobayashi, 1968) † represented as Trigonioides subquadratus (T. Kobayashi, 1968) †
Subgenus Trigonioides (Paratrigonioides) T. Kobayashi, 1968 † accepted as Trigonioides (Trigonioides) T. Kobayashi & K. Suzuki, 1936 †
Subgenus Trigonioides (Trigonioides) T. Kobayashi & K. Suzuki, 1936 † represented as Trigonioides T. Kobayashi & K. Suzuki, 1936 †
Subgenus Trigonioides (Wakinoa) Ota, 1963 † represented as Trigonioides T. Kobayashi & K. Suzuki, 1936 †
Subgenus Trigonioides (Xizangotrigonioides) F.-X. Guo, 1986 † accepted as Xizangotrigonioides F.-X. Guo, 1986 †
Species Trigonioides altiformis Q.-H. Ma, 1976 †
Species Trigonioides amakusensis Kikuchi & Tashiro, 1999 †
Species Trigonioides antiques Z.-W. Gu & Q.-H. Ma, 1976 † accepted as Nippononaia (Arctonaia) antiques Z.-W. Gu & Q.-H. Ma, 1976 †
Species Trigonioides bisinuatus (Mansuy, 1912) †
Species Trigonioides bongkyuni S.-Y. Yang, 1979 †
Species Trigonioides cardiiformis (Martinson, 1953) † accepted as Pseudohyria cardiiformis (Martinson, 1953) †
Species Trigonioides changlingensis Z.-W. Gu, 1999 † accepted as Nippononaia jilinensis Z.-W. Gu & J.-S. Yu, 1976 †
Species Trigonioides cheongi (S.-Y. Yang, 1976) †
Species Trigonioides corbiculoides Martinson, 1957 † accepted as Pseudohyria corbiculoides (Martinson, 1957) †
Species Trigonioides didymoscriptus (Z.-W. Gu, 1976) †
Species Trigonioides diversicostatus Hoffet, 1937 † accepted as Trigonioides (Diversitrigonioides) diversicostatus (Hoffet, 1937) †
Species Trigonioides elegans J.-G. Sha, 1993 †
Species Trigonioides fujianensis F.-X. Guo, 1986 † accepted as Trigonioides (Trigonioides) quadratus Z.-W. Gu & Q.-H. Ma, 1976 †
Species Trigonioides gigantus R.-J. Zhang, 1977 †
Species Trigonioides goshourensis Komatsu, J.-H. Chen, Ugai & Hirose, 2007 †
Species Trigonioides guangxiensis Q.-H. Ma & B.-Y. Huang, 1979 †
Species Trigonioides helongjiangensis J.-G. Sha & Z.-W. Gu, 1984 †
Species Trigonioides hissariensis Martinson, 1969 †
Species Trigonioides intermedia (Hase, 1960) † accepted as Trigonioides intermedius (Hase, 1960) †
Species Trigonioides intermedius (Hase, 1960) †
Species Trigonioides kiritaniensis [sic] † accepted as Trigonioides kitadaniensis Maeda, 1963 †
Species Trigonioides kitadaniensis Maeda, 1963 † accepted as Trigonioides (Wakinoa) tetoriensis Maeda, 1963 †
Species Trigonioides kobayashi Hoffet, 1937 †
Species Trigonioides kobayashii Matsumoto, 1938 † accepted as Trigonioides (Kumamotoa) matsumotoi T. Kobayashi & K. Suzuki, 1941 †
Species Trigonioides kodairai T. Kobayashi & K. Suzuki, 1936 †
Species Trigonioides kodairaiformis Martinson, 1965 †
Species Trigonioides lacustris Martinson, 1957 † accepted as Pseudohyria pseudoanodonta (Martinson, 1957) †
Species Trigonioides laotiae Hoffet, 1937 † accepted as Trigonioides kobayashi Hoffet, 1937 †
Species Trigonioides lenaensis Martinson, 1965 †
Species Trigonioides longa Muzafarova, 1964 † accepted as Pseudohyria longa (Muzafarova, 1964) †
Species Trigonioides matsumotoi T. Kobayashi & K. Suzuki, 1941 †
Species Trigonioides mifunensis Tamura, 1970 †
Species Trigonioides mongolensis (Martinson, 1953) † accepted as Pseudohyria cardiiformis (Martinson, 1953) †
Species Trigonioides obsoletus (Hase, 1960) † accepted as Nippononaia (Martinsonella) obsoleta Hase, 1960 †
Species Trigonioides ovalis Z.-W. Gu & Q.-H. Ma, 1976 † accepted as Peregrinoconcha ovalis (Z.-W. Gu & Q.-H. Ma, 1976) †
Species Trigonioides paucisulcatus K. Suzuki, 1940 †
Species Trigonioides pseudoanodonta Martinson, 1957 † accepted as Pseudohyria pseudoanodonta (Martinson, 1957) †
Species Trigonioides qiujiagouensis X.-Z. Liu, 1984 †
Species Trigonioides quadratus Z.-W. Gu & Q.-H. Ma, 1976 †
Species Trigonioides radiatus Martinson, 1957 † accepted as Pseudohyria radiata (Martinson, 1957) †
Species Trigonioides rotundus Q.-H. Ma, 1976 † accepted as Trigonioides kodairai T. Kobayashi & K. Suzuki, 1936 †
Species Trigonioides sanxingdingensis X.-Z. Liu, 1984 †
Species Trigonioides subcentralis Z.-W. Gu & Q.-H. Ma, 1976 † accepted as Trigonioides quadratus Z.-W. Gu & Q.-H. Ma, 1976 †
Species Trigonioides subquadratus (T. Kobayashi, 1968) †
Species Trigonioides suzukii Ota, 1959 †
Species Trigonioides tachtamyschensis Martinson, 1961 † accepted as Pseudohyria tachtamyshensis (Martinson, 1961) †
Species Trigonioides tamurai (S.-Y. Yang, 1976) †
Species Trigonioides tetoriensis Maeda, 1963 †
Species Trigonioides trigonus Hoffet, 1937 † accepted as Trigonioides kobayashi Hoffet, 1937 †
Species Trigonioides tuberculata Martinson, 1957 † accepted as Pseudohyria tuberculata (Martinson, 1957) †
Species Trigonioides turistschewi Martinson, 1957 † accepted as Pseudohyria (Pseudohyria) tuberculata (Martinson, 1957) †
Species Trigonioides urgalensis Yakushina, 1967 †
Species Trigonioides veneriformis Martinson, 1957 † accepted as Pseudohyria veneriformis (Martinson, 1957) †
Species Trigonioides vernadzkii Muzafarova, 1964 † accepted as Pseudohyria vernadzkii (Muzafarova, 1964) †
Species Trigonioides wakinoensis (Ota, 1959) †
Species Trigonioides yongkangensis Z.-W. Gu & Q.-H. Ma, 1976 †
Species Trigonioides yunnanensis Z.-W. Gu & Q.-H. Ma, 1962 †
Species Trigonioides zuleihae Muzafarova, 1964 † accepted as Pseudohyria zuleihae (Muzafarova, 1964) †
Genus Trigonoides [sic] † accepted as Trigonioides T. Kobayashi & K. Suzuki, 1936 †
Genus Wakinoa Ota, 1963 † accepted as Trigonioides (Wakinoa) Ota, 1963 †
Genus Mekongonaia W. Yu & Z.-W. Gu, 1962 †
Genus Pledgia Ludbrook, 1985 † (1)
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