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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)
Infraclass Heteroconchia (16 648)
Infraclass Pteriomorphia (6 660)
Superorder Eupteriomorphia
Order Arcida (1 227)
Order Colpomyida † (6)
Order Cyrtodontida † (66)
Order Limida (358)
Order Myalinida † (576)
Superfamily Alatoconchoidea H. Termier, G. Termier & de Lapparent, 1974 †
Superfamily Ambonychioidea S. A. Miller, 1877 † (71)
Superfamily Prokopievskioidea H. E. Vokes, 1967 † (505)
Family Anadontellidae Silantiev, 2011 † (34)
Family Anthraconautidae Kanev, 1980 † accepted as Naiaditidae Scarlato & Starobogatov, 1979 †
Family Kinerkaellidae Scarlato & Starobogatov, 1979 † accepted as Kinerkaellinae Scarlato & Starobogatov, 1979 †
Family Naiaditidae Scarlato & Starobogatov, 1979 † (291)
Family Prokopievskiidae H. E. Vokes, 1967 † (180)
Subfamily Abiellinae Starobogatov, 1970 † (29)
Subfamily Concinellinae Silantiev, 2011 † (37)
Subfamily Kinerkaellinae Scarlato & Starobogatov, 1979 † (75)
Genus Adzvaella Kanev, 1983 † (4)
Genus Aliena Betekhtina, 1998 † (1)
Genus Augea Khalfin, 1950 † (7)
Genus Bunguria Tokareva, 1988 † (2)
Genus Intaella Kanev, 1989 † (3)
Genus Kinerkaella Khalfin, 1950 † (8)
Genus Limnedmondia Scarlato & Starobogatov, 1979 † (1)
Genus Mrassiella Ragozin, 1935 † (34)
Species Mrassiella alternata Betekhtina, 1974 †
Species Mrassiella ampla Khalfin, 1950 † accepted as Mrassiellina ampla (Khalfin, 1950) †
Species Mrassiella animosa Spasskaya, 1964 †
Species Mrassiella anscheriana Ragozin, 1958 †
Species Mrassiella antiqua Lapshina, 1958 †
Species Mrassiella concinna Khalfin, 1950 †
Species Mrassiella conformata Betekhtina, 1974 †
Species Mrassiella degenerata Ragozin, 1958 †
Species Mrassiella elongata (B. I. Chernyshev, 1930) † accepted as Anthraconaia elongata (B. I. Chernyshev, 1930) †
Species Mrassiella fedotovi Ragozin, 1958 †
Species Mrassiella finitima Betekhtina, 1974 †
Species Mrassiella gigantea Lapshina, 1958 †
Species Mrassiella gigantissima Khalfin, 1950 † accepted as Ussoviella gigantissima (Khalfin, 1950) †
Species Mrassiella gloriosa Ragozin, 1935 †
Species Mrassiella grandis Tokareva, 1970 †
Species Mrassiella indigena Spasskaya, 1964 †
Species Mrassiella insueta Betekhtina, 1965 †
Species Mrassiella ivanovi (B. I. Chernyshev, 1930) † accepted as Sinomya ivanovi (B. I. Chernyshev, 1930) †
Species Mrassiella kemeroviensis Benediktova, 1959 † accepted as Mrassiellina kemeroviensis (Benediktova, 1959) †
Species Mrassiella komiensis Kanev, 1977 † accepted as Concinella komiensis (Kanev, 1977) †
Species Mrassiella kumsassiana Ragozin, 1958 †
Species Mrassiella kusnetzkiana Ragozin, 1958 †
Species Mrassiella larga Spasskaya, 1964 †
Species Mrassiella linguiformis Khalfin, 1950 †
Species Mrassiella lira Lapshina, 1958 †
Species Mrassiella magniforma Ragozin, 1935 †
Variety Mrassiella magniforma var. permagna Khalfin, 1950 † accepted as Mrassiella permagna Khalfin, 1950 †
Variety Mrassiella magniforma var. sataniensis Ragozin, 1958 †
Variety Mrassiella magniforma var. taimyrensis Lyutkevich & Lobanova, 1960 †
Variety Mrassiella magniforma var. verchotomskiensis Ragozin, 1958 †
Forma Mrassiella magniforma f. longa Betekhtina, 1974 †
Forma Mrassiella magniforma f. postera Khalfin, 1950 †
Forma Mrassiella magniforma f. recta Betekhtina, 1974 †
Species Mrassiella magniformis [sic] † accepted as Mrassiella magniforma Ragozin, 1935 †
Species Mrassiella minusinica Spasskaya, 1966 †
Species Mrassiella oblonga Ragozin, 1935 †
Species Mrassiella obscura Ragozin, 1935 †
Species Mrassiella ovata Khalfin, 1950 †
Species Mrassiella parma Lapshina, 1958 †
Species Mrassiella parva Ragozin, 1958 †
Species Mrassiella paucula (Spasskaya, 1966) †
Species Mrassiella perfidae Spasskaya, 1964 †
Species Mrassiella permagna Khalfin, 1950 †
Species Mrassiella prima Betekhtina, 1966 †
Species Mrassiella procopiensis Ragozin, 1939 †
Species Mrassiella pygmaea (B. I. Chernyshev, 1930) † accepted as Anthraconaia pygmaea (B. I. Chernyshev, 1930) †
Species Mrassiella rhomboidea Khalfin, 1950 †
Species Mrassiella ridicula Ragozin, 1935 †
Species Mrassiella schurtschakiensis Ragozin, 1962 †
Species Mrassiella semisulcata Ragozin, 1958 †
Species Mrassiella sera Khalfin, 1950 †
Species Mrassiella sincera Spasskaya, 1964 † accepted as Summita sincera (Spasskaya, 1964) †
Species Mrassiella striata Khalfin, 1950 †
Species Mrassiella subcordata Khalfin, 1950 †
Species Mrassiella subtrigonalis Betekhtina, 1965 †
Species Mrassiella superlata Tokareva, 1970 †
Species Mrassiella taeniolata (Khalfin, 1950) †
Species Mrassiella trapezoidalis (Krotov, 1888) †
Species Mrassiella umbonata Benediktova, 1959 † accepted as Mrassiellina umbonata (Benediktova, 1959) †
Genus Mrassiellina Betekhtina, 1974 † (8)
Genus Neomrassiella C. M. Kolesnikov, 1980 † (3)
Genus Orthonaiadites Khalfin, 1950 † (1)
Genus Ragozinella Betekhtina, 1988 † accepted as Abiella (Ragozinella) Betekhtina, 1988 †
Genus Ussoviella Betekhtina, 1988 † (3)
Subfamily Prokopievskiinae H. E. Vokes, 1967 † (39)
Genus Iniana Ragozin, 1961 †
Genus Iniella Ragozin, 1956 †
Genus Kemerovskia Ragozin, 1956 †
Genus Kusbassoconcha Ragozin, 1956 †
Family Sinomyidae Scarlato & Starobogatov, 1979 † accepted as Prokopievskiidae H. E. Vokes, 1967 †
Order Mytilida (707)
Order Ostreida (706)
Order Pectinida (3 004)
Order Pteriida accepted as Ostreida
Order Pteriomorphia incertae sedis † (1)
Superfamily Yunannioidea R.-J. Zhang & Z.-J. Niu, 2021 † (2)
Family Ischyrodontidae Scarlato & Starobogatov, 1979 † (2)
Family Matheriidae Scarlato & Starobogatov, 1979 † (1)
Family Myodakryotidae Tunnicliff, 1987 † (4)
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 (1 838)
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