| Tagelus | Solecurtidae | Tellinoidea | Tornatellaea | Acteoninae | Acteonidae | Acteonoidea | ||
| Talityphis | Typhinae | Muricidae | Muricoidea | Tornus | Tornidae | Tornoidea | ||
| Talochlamys | Chlamydinae | Pectinidae | Pectinoidea | Toroliva | Olivellinae | Olividae | Volutoidea | |
| Tanea | Naticinae | Naticidae | Naticoidea | Torquesia | Turritellinae | Turritellidae | Cerithioidea | |
| Taniella | Polinicidae | Naticoidea | Trachelochetus | Clavatulinae | Turridae | Conoidea | ||
| Tapes | Tapetinae | Veneridae | Veneroidea | Trachycardium | Trachycardiinae | Cardiidae | Cardioidea | |
| Taurasia | Rapaninae | Muricidae | Muricoidea | Trachypollia | Ocenebrinae | Muricidae | Muricoidea | |
| Tawera | Chioninae | Veneridae | Veneroidea | Trajana | Photinae | Buccinidae | Buccinoidea | |
| Tectarius | Pomatiasinae | Pomatiasidae | Littorinoidea | Traliopsis | Ellobiinae | Ellobiidae | Ellobioidea | |
| Tectonatica | Naticinae | Naticidae | Naticoidea | Transennella | Meretricinae | Veneridae | Veneroidea | |
| Tectura | Lottiinae | Lottiidae | Patelloidea | Trapezium | Trapeziidae | Glossoidea | ||
| Tectus | Trochinae | Cirridae | Cirroidea | Tresus | Lutrariinae | Mactridae | Mactroidea | |
| Tegillarca | Anadarinae | Arcidae | Arcoidea | Trichotropis | Capulidae | Calyptraeoidea | ||
| Tegula | Tegulinae | Cirridae | Cirroidea | Tricolia | Tricoliinae | Turbinidae | Trochoidea | |
| Teinostoma | Barleeinae | Barleeidae | Rissooidea | Tridacna | Tridacnidae | Tridacnoidea | ||
| Teleochilus | Borsoniinae | Conidae | Conoidea | Triforis | Triforinae | Cerithiopsidae | Ptenoglossa | |
| Teleostoma | Diastomatinae | Diastomatidae | Cerithioidea | Trigonarca | Arcullaeinae | Glycymerididae | Limopsoidea | |
| Telescopium | Potamininae | Potamididae | Cerithioidea | Trigonia | Trigoniidae | Trigonioidea | ||
| Tellidora | Tellininae | Tellinidae | Tellinoidea | Trigonocardia | Fraginae | Cardiidae | Cardioidea | |
| Tellina | Tellininae | Tellinidae | Tellinoidea | Trigonodesma | Trinacrinae | Noetiidae | Arcoidea | |
| Temblornia | Leptonidae | Galeommatoidea | Trigonostoma | Cancellariinae | Cancellariidae | Mitroidea | ||
| Tenagodes | Siliquariidae | Cerithioidea | Trinacria | Trinacrinae | Noetiidae | Arcoidea | ||
| Tenuiacteon | Acteoninae | Acteonidae | Acteonoidea | Triphora | Trphorinae | Triphoridae | Ptenoglossa | |
| Tenuicerithium | Cerithiinae | Cerithiidae | Cerithioidea | Triplofusus | Fasciolariinae | Fasciolariidae | Columbelloidea | |
| Tenuicorbula | Caryocorbulinae | Corbulidae | Myoidea | Tritonoharpa | Admetinae | Cancellariidae | Mitroidea | |
| Tenuiscala | Nystiellinae | Epitoniidae | Janthinoidea | Trivia | Trividae | Lamellarioidea | ||
| Terebellopsis | Seraphsidae | Stromboidea | Trochus | Trochinae | Cirridae | Cirroidea | ||
| Terbraspira | Fasciolariinae | Fasciolariidae | Columbelloidea | Trophon | Trphoninae | Muricidae | Muricoidea | |
| Terebellum | Seraphsidae | Stromboidea | Trophonopsis | Trphoninae | Muricidae | Muricoidea | ||
| Terebrala | Terebrinae | Terebridae | Conoidea | Tropicolpus | Turritellinae | Turritellidae | Cerithioidea | |
| Terebralia | Tiaracerithiinae | Batillariidae | Cerithioidea | Tropisurcula | Clavatulinae | Turridae | Conoidea | |
| Teredina | Teredininae | Teredinidae | Pholadoidea | Tropochasca | Melongeninae | Melongenidae | Buccinoidea | |
| Teredo | Teredininae | Teredinidae | Pholadoidea | Trossulasalpinx | Ocenebrinae | Muricidae | Muricoidea | |
| Teremelon | Zidoninae | Volutidae | Volutoidea | Truncaria | Buccininae | Buccinidae | Buccinoidea | |
| Teretia | Daphnellinae | Conidae | Conoidea | Truncatella | Truncatellidae | Littorinoidea | ||
| Ternivoluta | Athletidae | Volutoidea | Trypanaxis | Trypanaxidae | Cerithioidea | |||
| Texigryphaea | Pycnodonteinae | Gryphaeidae | Ostreoidea | Tryptychus | Odostomellinae | Pyramidellidae | Pyramidelloidea | |
| Thais | Rapaninae | Muricidae | Muricoidea | Tucetona | Glycymeridinae | Glycymerididae | Limopsoidea | |
| Thala | Costellariidae | Mitroidea | Tudivasum | Vasidae | Turbinelloidea | |||
| Thalotia | Trochinae | Cirridae | Cirroidea | Tugali | Emarginulinae | Fissurellidae | Fissurelloidea | |
| Thanetinassa | Buccininae | Buccinidae | Buccinoidea | Tugonella | Myinae | Myidae | Myoidea | |
| Theodoxus | Neritiinae | Neritidae | Neritoidea | Tugonia | Myinae | Myidae | Myoidea | |
| Thetironia | Mactromyidae | Lucinoidea | Turbinella | Turbinellidae | Turbinelloidea | |||
| Thetys | Aplysinae | Aplysidae | Aplysioidea | Turbo | Turbininae | Turbinidae | Trochoidea | |
| Thiara | Thiarinae | Thiaridae | Cerithioidea | Turbonilla | Turbonillinae | Pyramidellidae | Pyramidelloidea | |
| Thracia | Thraciidae | Pandoroidea | Turricula | Clavatulinae | Turridae | Conoidea | ||
| Thyasira | Thyasirinae | Thyasiridae | Lucinoidea | Turrifulgur | Busyconinae | Melongenidae | Buccinoidea | |
| Thyca | Thycidae | Eulimoidea | Turrilites | Turrilitidae | Ammonoida | |||
| Thylacus | Calyptraeinae | Calyptraeidae | Calyptraeoidea | Turris | Turrinae | Turridae | Conoidea | |
| Tiaraturris | Pseudomelatonin | Pseudomelatonida | Muricoidea | Turriscala | Epitoniinae | Epitoniidae | Janthinoidea | |
| Tiberia | Pyramidellinae | Pyramidellidae | Pyramidelloidea | Turritella | Turritellinae | Turritellidae | Cerithioidea | |
| Tibia | Rostellariinae | Strombidae | Stromboidea | Tylospira | Struthiolariidae | Stromboidea | ||
| Tiburnus | Trochinae | Cirridae | Cirroidea | Tylostoma | Family unknown | Naticoidea | ||
| Timoclea | Chioninae | Veneridae | Veneroidea | Tympanotonus | Potamininae | Potamididae | Cerithioidea | |
| Timothynus | Ungulinidae | Lucinoidea | Typhinellus | Typhinae | Muricidae | Muricoidea | ||
| Tivela | Meretricinae | Veneridae | Veneroidea | Typhis | Typhinae | Muricidae | Muricoidea | |
| Tivelina | Meretricinae | Veneridae | Veneroidea | Uberella | Polinicidae | Naticoidea | ||
| Tomopleura | Clathurellinae | Conidae | Conoidea | Umbilia | Erroneinae | Cypraeidae | Cypraeoidea | |
| Tomostoma | Neritiinae | Neritidae | Neritoidea | Umbonium | Umboniinae | Cirridae | Cirroidea | |
| Tomyris | Turritellinae | Turritellidae | Cerithioidea | Umbraculum | Umbraculidae | Pleurobranchioidea | ||
| Tonna | Tonnidae | Tonnoidea | Unedogemmula | Turrinae | Turridae | Conoidea | ||
| Torcula | Turritellinae | Turritellidae | Cerithioidea | Unio | Unioninae | Unionidae | Unionoidea | |
| Torculoidella | Turritellinae | Turritellidae | Cerithioidea | Unitas | Cancellariinae | Cancellariidae | Mitroidea | |
| Torinia | Heliacinae | Architectonicidae | Architectonicoidea | Urosalpinx | Ocenebrinae | Muricidae | Muricoidea | |