| Babylonella | Cancellariinae | Cancellariidae | Mitroidea | Biplex | Ranellinae | Ranellidae | Tonnoidea | |
| Babylonia | Buccininae | Buccinidae | Buccinoidea | Bittium | Bittiinae | Cerithiidae | Cerithioidea | |
| Bactrocythara | Mangeliinae | Conidae | Conoidea | Bivetia | Cancellariinae | Cancellariidae | Mitroidea | |
| Bactrospira | Turritellinae | Turritellidae | Cerithioidea | Bivonia | Vermetidae | Vermetoidea | ||
| Baculites | Baculitidae | Ammonoida | Boeuvia | Divaricellinae | Lucinidae | Lucinoidea | ||
| Bailya | Buccininae | Buccinidae | Buccinoidea | Bolinus | Muricinae | Muricidae | Muricoidea | |
| Barbatia | Arcinae | Arcidae | Arcoidea | Bolma | Turbininae | Turbinidae | Trochoidea | |
| Barbatula | Arcinae | Arcidae | Arcoidea | Bonellitia | Admetinae | Cancellariidae | Mitroidea | |
| Barbotella | Turbininae | Turbinidae | Trochoidea | Boreodrillia | Clavinae | Conidae | Conoidea | |
| Barleia | Barleeinae | Barleeidae | Rissooidea | Boreotrophon | Trophoninae | Muricidae | Muricoidea | |
| Barnea | Pholadinae | Pholadidae | Pholadoidea | Bornia | Borniinae | Kelliidae | Galeommatoidea | |
| Barycypraea | Bernayinae | Cypraeidae | Cypraeoidea | Borsonia | Clathurellinae | Conidae | Conoidea | |
| Baryspira | Olivinae | Olividae | Volutoidea | Bothriembryon | Bulimulinae | Bulimulidae | Bulimuloidea | |
| Barytellina | Tellininae | Tellinidae | Tellinoidea | Bothrocorbula | Corbulinae | Corbulidae | Myoidea | |
| Bassina | Chioninae | Veneridae | Veneroidea | Botula | Modiolinae | Mytilidae | Mytiloidea | |
| Basterotia | Sportellidae | Cyamioidea | Bouryia | Emmericiinae | Micromelaniidae | Rissooidea | ||
| Bathyarca | Anadarinae | Arcidae | Arcoidea | Boutillieria | Colloniinae | Turbinidae | Trochoidea | |
| Bathytoma | Clathurellinae | Conidae | Conoidea | Brachidontes | Mytilinae | Mytilidae | Mytiloidea | |
| Bathytormus | Crassatellinae | Crassatellidae | Crassatelloidea | Brachycithara | Mangeliinae | Conidae | Conoidea | |
| Batillaria | Batillariinae | Batillariidae | Cerithioidea | Brachysycon | Busyconinae | Melongenidae | Buccinoidea | |
| Bayania | Pseudomelaniidae | Cerithioidea | Brocchinia | Cancellariinae | Cancellariidae | Mitroidea | ||
| Bedeva | Ocenebrinae | Muricidae | Muricoidea | Brotia | Thiarinae | Thiaridae | Cerithioidea | |
| Beguina | Carditinae | Carditidae | Carditoidea | Bruetia | Ungulinidae | Lucinoidea | ||
| Bela | Mangeliinae | Conidae | Conoidea | Buccinofusus | Fasciolariinae | Fasciolariidae | Columbelloidea | |
| Belatomina | Neogastropoda Unclas. | Neogastropoda | Buccinorbis | Pseudolividae | Buccinoidea | |||
| Belemnitella | Belemnitidae | Coleoida | Buccinulum | Buccininae | Buccinidae | Buccinoidea | ||
| Bellastraea | Turbininae | Turbinidae | Trochoidea | Buccinum | Buccininae | Buccinidae | Buccinoidea | |
| Bellifusus | Fasciolariinae | Fasciolariidae | Columbelloidea | Buchozia | Oenopotinae | Conidae | Conoidea | |
| Bellucina | Lucininae | Lucinidae | Lucinoidea | Bufonaria | Bursidae | Tonnoidea | ||
| Belophos | Clavatulinae | Turridae | Conoidea | Bulichnina | Cylichnidae | Acteonoidea | ||
| Beloptera | Belopteridae | Sepioidea | Cephalopoda | Bulliopsis | Bulliinae | Nassariidae | Buccinoidea | |
| Belosaepia | Belosaepiidae | Sepioidea | Cephalopoda | Bulla | Bullidae | Bulloidea | ||
| Bembicium | Bembicinae | Littorinidae | Littorinoidea | Bullata | Marginellinae | Marginellidae | Volutoidea | |
| Bemnoistia | Brachytrematidae | Cerithioidea | Bullia | Bulliinae | Nassariidae | Buccinoidea | ||
| Benthomangelia | Mangeliinae | Conidae | Conoidea | Bursa | Bursidae | Tonnoidea | ||
| Beretra | Clavatulinae | Turridae | Conoidea | Busycon | Busyconinae | Melongenidae | Buccinoidea | |
| Bernaya | Bernayinae | Cypraeidae | Cypraeoidea | Busycotypus | Busyconinae | Melongenidae | Buccinoidea | |
| Bezanconia | Cerithiinae | Cerithiidae | Cerithioidea | Byssocardium | Aviculariidae | Tridacnoidea | ||
| Bicorbula | Caryocorbulinae | Corbulidae | Myoidea | Bythinella | Bythinellinae | Hydrobiidae | Rissooidea | |
| Biomphalaria | Planorbinae | Planorbidae | Planorbioidea | |||||