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Mollusca (133 377)
Subphylum Aculifera
Subphylum Conchifera
Subphylum Placophora accepted as Polyplacophora
Superclass Aplacophora
Class Amphineura accepted as Aculifera
Class Bivalvia (25 099)
Subclass Autobranchia (23 371)
Infraclass Heteroconchia (16 695)
Subterclass Archiheterodonta (1 219)
Subterclass Euheterodonta (11 399)
Subterclass Heterodonta
Subterclass Palaeoheterodonta (4 076)
Order Trigoniida (1 484)
Superfamily Megatrigonioidea van Hoepen, 1929 † (336)
Superfamily Myophorelloidea T. Kobayashi, 1954 † (378)
Superfamily Pseudocardinioidea Martinson, 1961 † (176)
Superfamily Trigonioidea Lamarck, 1819 (350)
Family Costatoriidae Newell & Boyd, 1975 † accepted as Myophoriidae Bronn, 1849 †
Family Eoastartidae Newell & Boyd, 1975 † accepted as Eoastartinae Newell & Boyd, 1975 †
Family Eoschizodidae Newell & Boyd, 1975 † (6)
Family Erugoniidae McRoberts, 2017 † (5)
Family Groeberellidae E. Pérez, Reyes & S. E. Damborenea, 1995 † (1)
Family Ladinomyidae Prinoth & Posenato, 2023 † (1)
Family Myophoriidae Bronn, 1849 † (71)
Family Prosogyrotrigoniidae T. Kobayashi, 1954 † (7)
Family Scaphellinidae Newell & Ciriacks, 1962 † (3)
Family Schizodidae Newell & Boyd, 1975 † (41)
Family Sinodoridae Pojeta & R.-J. Zhang, 1984 † accepted as Sinodorinae Pojeta & R.-J. Zhang, 1984 †
Family Trigoniidae Lamarck, 1819 (215)
Subfamily Austrotrigoniinae Skwarko, 1968 † (30)
Subfamily Minetrigoniinae T. Kobayashi, 1954 † (24)
Subfamily Neotrigoniinae T. Kobayashi, 1954 (22)
Subfamily Pleurotrigoniinae van Hoepen, 1929 † (19)
Subfamily Trigoniinae Lamarck, 1819 † (93)
Genus Cornbrashella Ayoub-Hannaa, M. R. Cooper, Abdelhady & Fürsich, 2024 † (2)
Genus Cotswoldella Ayoub-Hannaa, M. R. Cooper, Abdelhady & Fürsich, 2024 † (9)
Genus Lyridon J. De C. Sowerby, 1823 † accepted as Trigonia Bruguière, 1789 †
Genus Lyriodon Bronn, 1834 † accepted as Trigonia Bruguière, 1789 †
Genus Lyrodon Goldfuss, 1837 † accepted as Trigonia Bruguière, 1789 †
Subgenus Lyrodon (Trigonia) Bruguière, 1789 † accepted as Trigonia Bruguière, 1789 †
Species Lyrodon costatum (Parkinson, 1811) † accepted as Trigonia costata Parkinson, 1811 †
Variety Lyrodon costatum var. elongata Goldfuss, 1837 †
Variety Lyrodon costatum var. transversa Goldfuss, 1837 †
Variety Lyrodon costatum var. triangularis Goldfuss, 1837 †
Species Lyrodon deltoideum Goldfuss, 1837 †
Species Lyrodon excentricum Goldfuss, 1837 † accepted as Trigonia eccentrica Parkinson, 1811 †
Species Lyrodon herzogii Hausmann, 1837 † accepted as Transitrigonia herzogii (Hausmann, 1837) †
Species Lyrodon kefersteinii Münster, 1837 † accepted as Myophoria kefersteinii (Münster, 1837) †
Species Lyrodon laevigatum (Zieten, 1833) † accepted as Neoschizodus laevigatus (Zieten, 1833) †
Species Lyrodon lineatum Münster, 1837 †
Species Lyrodon muricatum Goldfuss, 1837 † accepted as Myophorella muricata (Goldfuss, 1837) †
Species Lyrodon ovatum Goldfuss, 1837 † accepted as Neoschizodus ovatus (Goldfuss, 1837) †
Species Lyrodon subclavellatum Münster, 1837 †
Species Lyrodon sulcatum Goldfuss, 1837 † accepted as Apiotrigonia sulcataria (Lamarck, 1819) †
Genus Magharitrigonia Ayoub-Hannaa, M. R. Cooper, Abdelhady & Fürsich, 2024 † (4)
Genus Modestella Hautmann, 2001 † accepted as Modesticoncha Hautmann, 2009 †
Genus Modesticoncha Hautmann, 2009 † accepted as Primatrigonia Repin, 2001 †
Genus Neuquenitrigonia H. A. Leanza & Garate Zubillaga, 1987 † (2)
Genus Primatrigonia Repin, 2001 † (2)
Genus Protrigonia F.-X. Guo, 1985 † accepted as Primatrigonia Repin, 2001 †
Genus Trigonia Bruguière, 1789 † (74)
Genus Geratrigonia T. Kobayashi, 1954 † (4)
Genus Guineana Skwarko, 1967 † (1)
Genus Heslingtonia C. A. Fleming, 1987 † (1)
Genus Kyushutrigonia Tamura & Nishimura, 1994 † (1)
Genus Latitrigonia T. Kobayashi, 1957 † (8)
Genus Nipponitrigonia L. R. Cox, 1952 † (7)
Genus Praemyophoria Khalfin, 1940 †
Genus Psilotrigonia L. R. Cox, 1952 † (5)
Genus Savelievitrigonia Repman, 1979 †
Superfamily Trigonioidoidea L. R. Cox, 1952 † (226)
Superfamily Trigonodoidea Modell, 1942 † (18)
Order Unionida (2 581)
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 (6 676)
Subclass Bivalvia incertae sedis (7)
Subclass Palaeotaxodonta accepted as Nuculida
Subclass Paleoheterodonta accepted as Palaeoheterodonta
Subclass Protobranchia (1 379)
Infraclass Cryptodonta † (342)
Class Caudofoveata (143)
Class Cephalopoda (1 933)
Class Conchifera accepted as Bivalvia
Class Cricoconarida † (1)
Class Gastropoda (103 088)
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 (1 381)
Class Polyplaxiphora accepted as Polyplacophora
Class Rostroconchia † (64)
Class Scaphopoda (754)
Class Solenoconchia accepted as Scaphopoda
Class Solenogastres (313)
Subclass Chaetodermomorpha accepted as Caudofoveata