| Cabestana | Cymatinae | Ranellidae | Tonnoidea | Columbarium | Columbariidae | Muricoidea | ||
| Cadella | Tellininae | Tellinidae | Tellinoidea | Columbella | Columbellinae | Columbellidae | Columbelloidea | |
| Cadulus | Gadilidae | Gadilimorpha | Scaphopoda | Columbellopsis | Pyreninae | Columbellidae | Columbelloidea | |
| Caecum | Caecidae | Rissooidea | Colus | Buccininae | Buccinidae | Buccinoidea | ||
| Caestocorbula | Corbulinae | Corbulidae | Myoidea | Coluzea | Columbariidae | Muricoidea | ||
| Caestocorbula | Caestocorbulinae | Corbulidae | Myoidea | Colwellia | Dorsaninae | Nassariidae | Buccinoidea | |
| Calcarata | Cancellariinae | Cancellariidae | Mitroidea | Comarmondia | Clathurellinae | Conidae | Conoidea | |
| Calliomphalus | Eucyclinae | Cirridae | Cirroidea | Cominella | Photinae | Buccinidae | Buccinoidea | |
| Calliostoma | Calliostomatinae | Cirridae | Cirroidea | Comitas | Cochlespirinae | Turridae | Conoidea | |
| Callista | Pitarinae | Veneridae | Veneroidea | Compsodrillia | Zonulispirinae | Turridae | Conoidea | |
| Callistotapes | Tapetinae | Veneridae | Veneroidea | Concholepas | Rapaninae | Muricidae | Muricoidea | |
| Callithaca | Chioninae | Veneridae | Veneroidea | Condylocardia | Condylocardiinae | Condylocardiidae | Carditoidea | |
| Callocardia | Pitarinae | Veneridae | Veneroidea | Conella | Pyreninae | Columbellidae | Columbelloidea | |
| Callucina | Lucininae | Lucinidae | Lucinoidea | Confusiscala | Subfamily unnamed | Epitoniidae | Janthinoidea | |
| Calophos | Bulliinae | Nassariidae | Buccinoidea | Congeria | Dreissenidae | Dreissenoidea | ||
| Calotrophon | Muricinae | Muricidae | Muricoidea | Conocerithium | Cerithiinae | Cerithiidae | Cerithioidea | |
| Calycoceras | Acanyhoceratidae | Ammonoida | Conocypraea | Erosariinae | Cypraeidae | Cypraeoidea | ||
| Calyptraea | Calyptraeinae | Calyptraeidae | Calyptraeoidea | Conolithes | Coninae | Terebridae | Conoidea | |
| Calyptraphorus | Subfam. undecided | Strombidae | Stromboidea | Conomitra | Costellariidae | Mitroidea | ||
| Campanile | Campanilidae | Cerithioidea | Conorbis | Conorbinae | Conidae | Conoidea | ||
| Canaliscala | Cerithideidae | Cerithioidea | Contraconus | Coninae | Terebridae | Conoidea | ||
| Canarium | Subfamily undecided | Strombidae | Stromboidea | Conus | Coninae | Terebridae | Conoidea | |
| Cancellaria | Cancellariinae | Cancellariidae | Mitroidea | Coptochetus | Buccininae | Buccinidae | Buccinoidea | |
| Cantharidus | Trochinae | Cirridae | Cirroidea | Coptosipho | Siphopsinae | Conidae | Conoidea | |
| Cantharus | Pisaniinae | Buccinidae | Buccinoidea | Coptostylus | Thiarinae | Thiaridae | Cerithioidea | |
| Caprina | Caprininae | Caprinidae | Hippuritoidea | Coralliophaga | Trapeziidae | Glossoidea | ||
| Capulus | Capulidae | Calyptraeoidea | Coralliophila | Coralliophylidae | Muricoidea | |||
| Cardiomya | Cuspidariidae | Cuspidariina | Corbicula | Corbiculidae | Corbiculoidea | |||
| Cardita | Carditinae | Carditidae | Carditoidea | Corbula | Corbulinae | Corbulidae | Myoidea | |
| Carditamera | Carditamerinae | Carditidae | Carditoidea | Cordieria | Clathurellinae | Conidae | Conoidea | |
| Carditella | Carditamerinae | Carditidae | Carditoidea | Cornulina | Melongeninae | Melongenidae | Buccinoidea | |
| Cardites | Carditesinae | Carditidae | Carditoidea | Corodrillia | Drilliidae | Muricoidea | ||
| Carditopsis | Condylocardiinae | Condylocardiidae | Carditoidea | Coronia | Turrinae | Turridae | Conoidea | |
| Cardium | Cardiinae | Cardiidae | Cardioidea | Cosa | Philobryidae | Limopsoidea | ||
| Caricella | Athletidae | Volutoidea | Cossmannia | Iravadiidae | Rissooidea | |||
| Carinacca | Naticinae | Naticidae | Naticoidea | Costacallista | Pitarinae | Veneridae | Veneroidea | |
| Carinodrillia | Crassispirinae | Turridae | Conoidea | Costanachis | Pyreninae | Columbellidae | Columbelloidea | |
| Caryocorbula | Caryocorbulinae | Corbulidae | Myoidea | Craspedopoma | Craspedopomatidae | Cyclophoroidea | ||
| Casmaria | Phaliinae | Cassidae | Tonnoidea | Crassatella | Crassatellinae | Crassatellidae | Crassatelloidea | |
| Cassis | Cassinae | Cassidae | Tonnoidea | Crassatellites | Crassatellinae | Crassatellidae | Crassatelloidea | |
| Catenotoma | Clavatulinae | Turridae | Conoidea | Crassatina | Crassatellinae | Crassatellidae | Crassatelloidea | |
| Caveola | Cancellariinae | Cancellariidae | Mitroidea | Crassimurex | Muricinae | Muricidae | Muricoidea | |
| Cavilucina | Lucininae | Lucinidae | Lucinoidea | Crassinella | Scambulinae | Crassatellidae | Crassatelloidea | |
| Cavolinia | Cavoliniinae | Cavoliniidae | Spiratelloidea | Crassispira | Crassispirinae | Turridae | Conoidea | |
| Cepatia | Naticinae | Naticidae | Naticoidea | Crassodoma | Pectininae | Pectinidae | Pectinoidea | |
| Cepatia | Polinicidae | Naticoidea | Crassopleura | Subfamily uncertain | Conidae | Conoidea | ||
| Cerastoderma | Cerastodermatiinae | Cardiidae | Cardioidea | Crassostrea | Crassostreinae | Ostreidae | Ostreoidea | |
| Ceratomyopsis | Ceratomyopsidae | Glossoidea | Crenella | Crenellinae | Mytilidae | Mytiloidea | ||
| Ceratostoma | Ocenebrinae | Muricidae | Muricoidea | Crenilabium | Acteoninae | Acteonidae | Acteonoidea | |
| Cereithiella | Cerithiellinae | Cerithiopsidae | Ptenoglossa | Creonella | Pyramidellinae | Pyramidellidae | Pyramidelloidea | |
| Cerithidea | Cerithideidae | Cerithioidea | Crepidula | Crepidulinae | Calyptraeidae | Calyptraeoidea | ||
| Cerithioclava | Cerithiinae | Cerithiidae | Cerithioidea | Creseis | Clionae | Cavoliniidae | Spiratelloidea | |
| Cerithiopsis | Cerithiopsinae | Cerithiopsidae | Ptenoglossa | Crioceratites | Ancyloceratidae | Ammonoida | ||
| Cerithium | Cerithiinae | Cerithiidae | Cerithioidea | Crithe | Cystiscinae | Cystiscidae | Volutoidea | |
| Cernina | Ampullospirinae | Ampullinidae | Naticoidea | Crommium | Ampullospirinae | Ampullinidae | Naticoidea | |
| Chama | Chamidae | Chamoidea | Crucibulum | Calyptraeinae | Calyptraeidae | Calyptraeoidea | ||
| Chamelea | Chioninae | Veneridae | Veneroidea | Cryoturris | Mangeliinae | Conidae | Conoidea | |
| Charcolleria | Cancellariinae | Cancellariidae | Mitroidea | Cryptochorda | Cryptochordidae | Columbelloidea | ||
| Chavanocerithium | Cerithiinae | Cerithiidae | Cerithioidea | Cryptoconchus | Acanthochitonidae | Acanthochitonina | Polyplacophora | |
| Charonia | Cymatinae | Ranellidae | Tonnoidea | Cryptoconus | Conorbinae | Conidae | Conoidea | |
| Cheilea | Hipponicidae | Calyptraeoidea | Cryptonatica | Naticinae | Naticidae | Naticoidea | ||
| Chesapecten | Pectininae | Pectinidae | Pectinoidea | Cryptospira | Marginellinae | Marginellidae | Volutoidea | |
| Chesasyrinx | Drillidae | Muricoidea | Ctena | Lucininae | Lucinidae | Lucinoidea | ||
| Chevallieria | Iravadiidae | Rissooidea | Ctenocardia | Fraginae | Cardiidae | Cardioidea | ||
| Chicoreus | Muricinae | Muricidae | Muricoidea | Ctenoides | Limidae | Limoidea | ||
| Chione | Chioninae | Veneridae | Veneroidea | Cubitostrea | Ostreinae | Ostreidae | Ostreoidea | |
| Chiton | Chitonidae | Chitonina | Polyplacophora | Cubitostrea | Crassostreinae | Ostreidae | Ostreoidea | |
| Chlamys | Chlamydinae | Pectinidae | Pectinoidea | Cucullaea | Cucullaeidae | Arcoidea | ||
| Chorus | Subfamily unknown | Muricidae | Muricoidea | Cucullaria | Grammatodontinae | Paralellodontidae | Arcoidea | |
| Chryssallida | Chrysallidinae | Pyramidellidae | Pyramidelloidea | Cultellus | Cutellinae | Pharidae | Tellinoidea | |
| Circe | Gafrarinae | Veneridae | Veneroidea | Cuna | Cuninae | Condylocardiidae | Carditoidea | |
| Circomphalus | Emmericiinae | Micromelaniidae | Rissooidea | Cuneocorbula | Caryocorbulinae | Corbulidae | Myoidea | |
| Circulus | Adeorbidae | Rissooidea | Curvemysella | Montacutinae | Montacutidae | Galeommatoidea | ||
| Cirsochilus | Colloniinae | Turbinidae | Trochoidea | Cuspidaria | Cuspidariidae | Cuspidariina | ||
| Cirsope | Elachisinidae | Rissooidea | Cuvierina | Clionae | Cavoliniidae | Spiratelloidea | ||
| Cirsotrema | Epitoniinae | Epitoniidae | Janthinoidea | Cyathodonta | Thraciidae | Pandoroidea | ||
| Cittarium | Trochinae | Cirridae | Cirroidea | Cycladicama | Ungulinidae | Lucinoidea | ||
| Claibornites | Milthinae | Lucinidae | Lucinoidea | Cyclinella | Cyclininae | Veneridae | Veneroidea | |
| Clanculus | Trochinae | Cirridae | Cirroidea | Cyclocardia | Carditamerinae | Carditidae | Carditoidea | |
| Clathrella | Amathininae | Pyramidellidae | Pyramidelloidea | Cyclomolops | Strombinae | Strombidae | Stromboidea | |
| Clathrobaculus | Mathildidae | Architectonicoidea | Cyclope | Nassariinae | Nassariidae | Buccinoidea | ||
| Clathrodrillia | Drilliidae | Muricoidea | Cyclostoma | Pomatiasinae | Pomatiasidae | Littorinoidea | ||
| Clathroscala | Epitoniinae | Epitoniidae | Janthinoidea | Cyclostremiscus | Skeneidae | Cirroidea | ||
| Clathurella | Clathurellinae | Conidae | Conoidea | Cyclosunetta | Sunettinae | Veneridae | Veneroidea | |
| Clausinella | Chioninae | Veneridae | Veneroidea | Cylichna | Cylichnidae | Acteonoidea | ||
| Clavagella | Clavagellidae | Clavagelloidea | Cylichnella | Cylichnidae | Acteonoidea | |||
| Clavatula | Clavatulinae | Turridae | Conoidea | Cylichnina | Retusidae | Bulloidea | ||
| Clavidrupa | Subfamily uncertain | Conidae | Conoidea | Cylindrotruncatum | Cylichnidae | Acteonoidea | ||
| Clavilithes | Fasciolariinae | Fasciolariidae | Columbelloidea | Cyllene | Cylleninae | Nassariidae | Buccinoidea | |
| Clavus | Drilliidae | Muricoidea | Cymatiella | Cymatinae | Ranellidae | Tonnoidea | ||
| Cleidothaerus | Cleidothaeridae | Pandoroidea | Cymatium | Cymatinae | Ranellidae | Tonnoidea | ||
| Clementia | Clementiniinae | Veneridae | Veneroidea | Cymatophos | Photinae | Buccinidae | Buccinoidea | |
| Clinocardium | Clinocardiinae | Cardiidae | Cardioidea | Cymatosyrinx | Drilliidae | Muricoidea | ||
| Clinura | Daphnellinae | Conidae | Conoidea | Cymbiola | Cymbiinae | Volutidae | Volutoidea | |
| Clithon | Neritinae | Neritidae | Neritoidea | Cymenorytis | Vanikoridae | Vanikoroidea | ||
| Clypeola | Calyptraeinae | Calyptraeidae | Calyptraeoidea | Cymia | Rapaninae | Muricidae | Muricoidea | |
| Clypeomorus | Cerithiinae | Cerithiidae | Cerithioidea | Cyniscella | Colloniinae | Turbinidae | Trochoidea | |
| Clypidina | Emarginulinae | Fissurellidae | Fissurelloidea | Cyphoma | Ovulinae | Ovulidae | Cypraeoidea | |
| Cnisma | Limopsidae | Limopsoidea | Cypraea | Cypraeinae | Cypraeidae | Cypraeoidea | ||
| Coanollonia | Colloniinae | Turbinidae | Trochoidea | Cypraecassis | Cassinae | Cassidae | Tonnoidea | |
| Cocculina | Cocculinidae | Cocculinoidea | Cypraedia | Cypraediinae | Cypraeidae | Cypraeoidea | ||
| Cochlespira | Cochlespirinae | Turridae | Conoidea | Cypraeorbis | Bernayinae | Cypraeidae | Cypraeoidea | |
| Cochliolepis | Tornidae | Tornoidea | Cypraeotrivia | Ovulinae | Ovulidae | Cypraeoidea | ||
| Cochlodesma | Periplomatidae | Pandoroidea | Cypraeovula | Cypraeinae | Cypraeidae | Cypraeoidea | ||
| Cochlostoma | Cochlostomatinae | Diplommatinidae | Cyclophoroidea | Cyprimeria | Clementiniinae | Veneridae | Veneroidea | |
| Codakia | Lucininae | Lucinidae | Lucinoidea | Cyproglobino | Ovulinae | Ovulidae | Cypraeoidea | |
| Colina | Cerithiellinae | Cerithiopsidae | Ptenoglossa | Cyrthoceratites | Nothoceratidae | Oncocerida | ||
| Collonia | Colloniinae | Turbinidae | Trochoidea | Cyrtochetus | Buccininae | Buccinidae | Buccinoidea | |
| Colombellina | Colombellinidae | Stromboidea | Cyrtodaria | Hiatellidae | Hiatelloidea | |||
| Colposigma | Turritellinae | Turritellidae | Cerithioidea | Cyrtopleura | Pholadinae | Pholadidae | Pholadoidea | |
| Colubraria | Colubrariinae | Fasciolariidae | Columbelloidea | |||||