Between brackets is the number of accepted species

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- Mollusca (133 239)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (25 078)
- Subclass Autobranchia (23 355)
- Subclass Bivalvia incertae sedis (7)
- Subclass Palaeotaxodonta accepted as Nuculida
- Subclass Paleoheterodonta accepted as Palaeoheterodonta
- Subclass Protobranchia (1 374)
- Infraclass Cryptodonta † (342)
- Superorder Inoceramiformii † (288)
- Superfamily Inoceramoidea Giebel, 1852 † (187)
- Superfamily Posidonioidea Neumayr, 1891 † (101)
- Family Aulacomyellidae Ichikawa, 1958 † (4)
- Family Bositridae Waterhouse, 2008 † accepted as Bositrinae Waterhouse, 2008 †
- Family Daonellidae Neumayr, 1891 † (15)
- Family Halobiidae Kittl, 1912 † (69)
- Genus Comatahalobia Polubotko, 2001 † (6)
- Genus Halobia Bronn, 1830 † (51)
- Subgenus Halobia (Halobia) Bronn, 1830 † represented as Halobia Bronn, 1830 †
- Subgenus Halobia (Zittelihalobia) Polubotko, 1984 † represented as Halobia Bronn, 1830 †
- Species Halobia (Zittelihalobia) hochstetteri Mojsisovics, 1874 † represented as Halobia hochstetteri Mojsisovics, 1874 †
- Species Halobia (Zittelihalobia) obruchevi Kiparisova, 1936 † represented as Halobia obruchevi Kiparisova, 1936 †
- Species Halobia (Zittelihalobia) superba Mojsisovics, 1874 † represented as Halobia superba Mojsisovics, 1874 †
- Species Halobia (Zittelihalobia) zealandica Trechmann, 1918 † represented as Halobia zealandica Trechmann, 1918 †
- Species Halobia arthaberi Kittl, 1912 † accepted as Halobia beyrichi (Mojsisovics, 1874) †
- Species Halobia austriaca Mojsisovics, 1874 †
- Species Halobia banmaensis Chen & Y.-J. Lu, 1979 †
- Species Halobia baqengensis Chen & Y.-J. Lu, 1979 †
- Species Halobia battakensis Volz, 1899 † accepted as Halobia sumatrensis (Volz, 1899) †
- Species Halobia beneckei Gemmellaro, 1882 †
- Species Halobia beyrichi (Mojsisovics, 1874) †
- Species Halobia bukovinensis Kittl, 1912 † accepted as Halobia austriaca Mojsisovics, 1874 †
- Species Halobia celtica Mojsisovics, 1874 †
- Species Halobia comata Bittner, 1899 † accepted as Comatahalobia comata (Bittner, 1899) †
- Species Halobia cordillerana J. P. Smith, 1927 †
- Species Halobia curionii Gemmellaro, 1882 †
- Species Halobia dalliana J. P. Smith, 1927 † accepted as Halobia septentrionalis J. P. Smith, 1927 †
- Species Halobia darwini Cafiero & de Capoa Bonardi, 1982 †
- Species Halobia distincta Mojsisovics, 1874 †
- Species Halobia dzhartyensis Polubotko, 2001 †
- Species Halobia eximia Mojsisovics, 1874 †
- Species Halobia fallax Mojsisovics, 1874 †
- Species Halobia fascigera Bittner, 1899 † accepted as Indigirohalobia fascigera (Bittner, 1899) †
- Species Halobia ganziensis Chen, 1964 † accepted as Pacifihalobia ganziensis (Chen, 1964) †
- Species Halobia gigantea J. P. Smith, 1927 † accepted as Halobia ornatissima J. P. Smith, 1927 †
- Species Halobia halorica Mojsisovics, 1874 †
- Species Halobia hochstetteri Mojsisovics, 1874 †
- Species Halobia hoernesi Mojsisovics, 1874 †
- Species Halobia indigirensis Yu. Popov, 1948 † accepted as Indigirohalobia indigirensis (Popov, 1948) †
- Species Halobia insignis Gemmellaro, 1882 †
- Species Halobia intermedia Mojsisovics, 1874 † accepted as Comatahalobia intermedia (Mojsisovics, 1874) †
- Species Halobia kawadai Yehara, 1927 †
- Species Halobia kenkerensis Polubotko & Alabushev, 1990 †
- Species Halobia kudleyi Polubotko, 1976 † accepted as Indigirohalobia kudleyi (Polubotko, 1976) †
- Species Halobia kwaluana Volz, 1899 †
- Species Halobia lilliei Marwick, 1953 †
- Species Halobia lineata (Münster, 1835) †
- Species Halobia lineatoides Chen & Y.-J. Lu, 1979 †
- Species Halobia lommeli Wissmann, 1841 † accepted as Daonella lommeli (Wissmann, 1841) †
- Species Halobia mediterranea Gemmellaro, 1882 †
- Species Halobia melnikovae Polubotko, 2001 †
- Species Halobia mengalamensis Volz, 1899 †
- Species Halobia mojsisovicsi Gemmellaro, 1882 †
- Species Halobia norica Mojsisovics, 1874 †
- Species Halobia nutekinensis (Polubotko & Alabushev, 1990) †
- Species Halobia obruchevi Kiparisova, 1936 †
- Species Halobia omolonensis Efimova, 1976 † accepted as Pacifihalobia omolonensis (Efimova, 1976) †
- Species Halobia oregonensis J. P. Smith, 1927 † accepted as Halobia ornatissima J. P. Smith, 1927 †
- Species Halobia ornatissima J. P. Smith, 1927 †
- Species Halobia pacalis McLearn, 1940 † accepted as Halobia cordillerana J. P. Smith, 1927 †
- Species Halobia pamirensis Kiparisova, 1947 †
- Species Halobia paraplicosa Kittl, 1912 † accepted as Halobia norica Mojsisovics, 1874 †
- Species Halobia partschi Kittl, 1912 †
- Species Halobia plicosa Mojsisovics, 1874 †
- Species Halobia qinghaiensis Y.-J. Lu, 1979 †
- Species Halobia radiata Gemmellaro, 1882 †
- Species Halobia rugosa Gümbel, 1861 †
- Species Halobia salinarum Bronn, 1830 †
- Species Halobia selwyni McRoberts, 2011 †
- Species Halobia septentrionalis J. P. Smith, 1927 †
- Species Halobia siciliana Kittl, 1912 †
- Species Halobia sicula Gemmellaro, 1882 †
- Species Halobia simaimaiensis Kobayashi & Masatani, 1968 † accepted as Halobia sumatrensis (Volz, 1899) †
- Species Halobia simplex Gemmellaro, 1882 †
- Species Halobia styriaca (Mojsisovics, 1874) †
- Species Halobia subaustriaca Kittl, 1912 †
- Species Halobia subcomata Kittl, 1912 † accepted as Comatahalobia subcomata (Kittl, 1912) †
- Species Halobia sublaevis Vukhuc, 1965 †
- Species Halobia subreticulata Gemmellaro, 1882 †
- Species Halobia sumatrensis (Volz, 1899) †
- Species Halobia superba Mojsisovics, 1874 †
- Species Halobia symmetrica J. P. Smith, 1927 † accepted as Halobia septentrionalis J. P. Smith, 1927 †
- Species Halobia tozeri McRoberts, 2011 †
- Species Halobia transversa Gemmellaro, 1882 †
- Species Halobia verchojanensis Efimova, 1976 † accepted as Pacifihalobia verchojanensis (Efimova, 1976) †
- Species Halobia zealandica Trechmann, 1918 †
- Species Halobia zitteli Lindström, 1865 †
- Genus Indigirohalobia Polubotko, 1984 † (4)
- Genus Pacifihalobia Polubotko, 1990 † (5)
- Genus Primahalobia Polubotko, 1988 † (3)
- Genus Zittelihalobia Polubotko, 1984 † accepted as Halobia (Zittelihalobia) Polubotko, 1984 †
- Family Posidoniidae Neumayr, 1891 † (13)
- Superorder Nepiomorphia † (54)
- Class Caudofoveata (143)
- Class Cephalopoda (1 917)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (102 988)
- 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 (753)
- Class Solenoconchia accepted as Scaphopoda
- Class Solenogastres (313)
- Subclass Chaetodermomorpha accepted as Caudofoveata