- bytantajensis, Pachymyonia bytantajensis Astafieva-Urbaitis, 1976 † - syn of: Myomedia carinata (Morris, 1845 †) - (VACUNELLIDAE) (FOSSIL)
- bythiaeca, Anodonta bythiaeca É.A.A. Locard, 1890 - syn of: Anodonta cygnea (C. Linnaeus, 1758) - (UNIONIDAE)
- Bythiamena, Genus Bythiamena Gardner, 1926 † (CARDIIDA (unassigned)) (FOSSIL)
- Bythinella, Genus Bythinella A. Moquin-Tandon, 1855 (BYTHINELLIDAE)
- bythinellaeformis, Atropis bythinellaeformis A. Garrett, 1884 - (ASSIMINEIDAE)
- BYTHINELLIDAE Locard, 1893 - Family (GASTROPODA-CAENOGASTROPODA-LITTORINIMORPHA)
- bythinelloides, Hydrobia santrici bythinelloides Miloševic, 1980 † - (HYDROBIIDAE) (FOSSIL)
- bythinellopenia, Strandzhia bythinellopenia D.G. Georgiev & P. Glöer, 2013 - (HYDROBIIDAE)
- Bythinia, Genus Bythinia Leach, 1818 (AMNICOLIDAE)
- Bythinia, syn of: Genus Bithynia W.E. Leach, 1818 (BITHYNIIDAE)
- bythiniopsis, Maackia bythiniopsis (W.A. Lindholm, 1909) - (AMNICOLIDAE)
- bythinoides, Skenea bythinoides J.G. Jeffreys, 1875 - (SKENEIDAE)
- bythinopsis, Amnicola bythinopsis A. Letourneux & J.R. Bourguignat, 1887 - syn of: Mercuria saharica (A. Letourneux & J.R. Bourguignat, 1887) - (AMNICOLIDAE)
- bythioeca, Anodonta bythioeca G. Servain, 1882 - syn of: Anodonta cygnea (C. Linnaeus, 1758) - (UNIONIDAE)
- Bythiospeum, Genus Bythiospeum J.R. Bourguignat, 1882 (HYDROBIIDAE)
- Bythoceras, Subgenus Paramelania (Bythoceras) J.E.S. Moore, 1898 (PALUDOMIDAE)
- Bythosphaera, Genus Bythosphaera J.D. Taylor & E.A. Glover, 2005 (LUCINIDAE)
- bytschkovi, Germanonautilus bytschkovi E.S. Sobolev, 1989 † - (TAINOCERATIDAE) (FOSSIL)
- bytschkovi, Monophyllites bytschkovi Vavilov, 1989 † - (USSURITIDAE) (FOSSIL)
- byungdoni, Acanthochitona byungdoni J.S. Hong, B. Dell'Angelo & R.A. Van Belle, 1990 - (ACANTHOCHITONIDAE)
- byzanthina, Sadleriana byzanthina (H.C. Küster, 1852) - (HYDROBIIDAE)
- byzanthina demirsoyii, Sadleriana byzanthina demirsoyii M.Z. Yildirim & Morkoyunlu, 1997 - (HYDROBIIDAE)
- Byzantia, Genus Byzantia Kosnik, 1997 † (NERITOPSIDAE) (FOSSIL)
- byzantina, Albinaria byzantina J.G.F. de Charpentier, 1852 - syn of: Cretica cretensis byzantina (J.G.F. de Charpentier, 1852) - (CLAUSILIIDAE)
- byzantina, Cretica cretensis byzantina (J.G.F. de Charpentier, 1852) - (CLAUSILIIDAE)
- byzantina, Theba byzantina J.R. Roth, 1839 - syn of: Theba pisana (O.F. Müller, 1774) - (HELICIDAE)
- byzantina, Anodonta byzantina H. Drouët, 1881 - syn of: Anodonta cygnea (C. Linnaeus, 1758) - (UNIONIDAE)
- byzovae, Aegeiceras byzovae Shevyrev, 1995 † - (GYMNITIDAE) (FOSSIL)
- bzoviensis, Belemnites bzoviensis Zeuschner, 1869 † - syn of: Rhopaloteuthis bzoviensis (Zeuschner, 1869 †) - (BELEMNITELLIDAE) (FOSSIL)
- bzoviensis, Rhopaloteuthis bzoviensis (Zeuschner, 1869 †) - (DUVALIIDAE) (FOSSIL)
- Bzybia, Subgenus Acrotoma (Bzybia) H. Nordsieck, 1977 (CLAUSILIIDAE)
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