| Namnetia | Montacutinae | Montacutidae | Galeommatoidea | Notogibbula | Trochinae | Cirridae | Cirroidea | |
| Nannamoria | Scaphellinae | Volutidae | Volutoidea | Notogrammatodon | Grammatodontinae | Paralellodontidae | Arcoidea | |
| Nannodiella | Clathurellinae | Conidae | Conoidea | Notoluponia | Erroneinae | Cypraeidae | Cypraeoidea | |
| Nanula | Umboniinae | Cirridae | Cirroidea | Notopeplum | Scaphellinae | Volutidae | Volutoidea | |
| Napulus | Vasidae | Turbinelloidea | Nototerebra | Terebrinae | Terebridae | Conoidea | ||
| Narona | Cancellariinae | Cancellariidae | Mitroidea | Nototrivia | Trividae | Lamellarioidea | ||
| Nassa | Rapaninae | Muricidae | Muricoidea | Notovoluta | Scaphellinae | Volutidae | Volutoidea | |
| Nassaria | Photinae | Buccinidae | Buccinoidea | Novathaca | Chioninae | Veneridae | Veneroidea | |
| Nassarina | Pyreninae | Columbellidae | Columbelloidea | Nozeba | Iravadiidae | Rissooidea | ||
| Nassarius | Nassariinae | Nassariidae | Buccinoidea | Nucella | Ocenebrinae | Muricidae | Muricoidea | |
| Natica | Naticinae | Naticidae | Naticoidea | Nucinella | Nucinellidae | Nucinelloidea | ||
| Naticarius | Naticinae | Naticidae | Naticoidea | Nucula | Nuculidae | Nuculoidea | ||
| Nausitoria | Bankiinae | Teredinidae | Pholadoidea | Nuculana | Nuculaninae | Nuculanidae | Nuculanoidea | |
| Nautilus | Nautilidae | Nautiloidea | Cephalopoda | Nuculoma | Nuculidae | Nuculoidea | ||
| Neaeromya | Montacutinae | Montacutidae | Galeommatoidea | Nucunella | Limopsidae | Limopsoidea | ||
| Neaeroporomya | Poromyidae | Poromyoidea | Nystia | Emmericiinae | Micromelaniidae | Rissooidea | ||
| Neilo | Neilonellidae | Nuculanoidea | Oamaruia | Cancellariinae | Cancellariidae | Mitroidea | ||
| Neithea | Subfamily uncertain | Pectinidae | Pectinoidea | Ocenebra | Ocenebrinae | Muricidae | Muricoidea | |
| Nemocardium | Protocardiinae | Cardiidae | Cardioidea | Ocenebrina | Ocenebrinae | Muricidae | Muricoidea | |
| Neoguraleus | Mangeliinae | Conidae | Conoidea | Ochetoclava | Cerithiinae | Cerithiidae | Cerithioidea | |
| Neopycnodonte | Pycnodonteinae | Gryphaeidae | Ostreoidea | Ocinebrina | Ocenebrinae | Muricidae | Muricoidea | |
| Neosimnia | Ovulinae | Ovulidae | Cypraeoidea | Odostomia | Odostomellinae | Pyramidellidae | Pyramidelloidea | |
| Neotrigonia | Trigoniidae | Trigonioidea | Oenopota | Oenopotinae | Conidae | Conoidea | ||
| Neptunea | Buccininae | Buccinidae | Buccinoidea | Ogivia | Trphorinae | Triphoridae | Ptenoglossa | |
| Nerinea | Nerineidae | Cerithioidea | Oliva | Olivinae | Olividae | Volutoidea | ||
| Nerita | Neritiinae | Neritidae | Neritoidea | Olivancillaria | Olivinae | Olividae | Volutoidea | |
| Neritina | Neritiinae | Neritidae | Neritoidea | Olivella | Olivellinae | Olividae | Volutoidea | |
| Neritoplica | Neritiinae | Neritidae | Neritoidea | Omalaxis | Omalaxidae | Architectonicoidea | ||
| Neritopsis | Neritopsidae | Neritoidea | Oniscidia | Moruminae | Harpidae | Muricoidea | ||
| Nevenulora | Lucininae | Lucinidae | Lucinoidea | Onustus | Xenophoridae | Xenophoroidea | ||
| Neverita | Polinicidae | Naticoidea | Oocorys | Oocorythinae | Cassidae | Tonnoidea | ||
| Nevia | Cancellariinae | Cancellariidae | Mitroidea | Opalia | Epitoniinae | Epitoniidae | Janthinoidea | |
| Newtoniella | Cerithiellinae | Cerithiopsidae | Ptenoglossa | Ophioarachnicola | Eulimidae | Eulimoidea | ||
| Nicema | Photinae | Buccinidae | Buccinoidea | Ophiodermella | Clathurellinae | Conidae | Conoidea | |
| Niso | Eulimidae | Eulimoidea | Orania | Ergalataxinae | Muricidae | Muricoidea | ||
| Nitidella | Columbellinae | >Columbellidae | Columbelloidea | Orinella | Pyramidellinae | Pyramidellidae | Pyramidelloidea | |
| Nitidotellina | Tellininae | Tellinidae | >Tellinoidea | Ornopsis | Fasciolariinae | Fasciolariidae | Columbelloidea | |
| Niveria | Trividae | Lamellarioidea | Orthaulax | Strombinae | Strombidae | Stromboidea | ||
| Nodicostellaria | Costellariidae | Mitroidea | Orthochetus | Cerithiinae | Cerithiidae | Cerithioidea | ||
| Nodilittorina | Littorininae | Littorinidae | Littorinoidea | Orthosurcula | Daphnellinae | Conidae | Conoidea | |
| Nodipecten | Pectininae | Pectinidae | Pectinoidea | Oryctomya | Trapeziidae | Glossoidea | ||
| Noetia | Noetiinae | Noetiidae | Arcoidea | Ostrea | Ostreinae | Ostreidae | Ostreoidea | |
| Norphora | Trphorinae | Triphoridae | Ptenoglossa | Otopleura | Pyramidellinae | Pyramidellidae | Pyramidelloidea | |
| Norrisia | Tegulinae | Cirridae | Cirroidea | Otostoma | Neritiinae | Neritidae | Neritoidea | |
| Northia | Photinae | Buccinidae | Buccinoidea | Ovatella | Pedipedinae | Ellobiidae | Ellobioidea | |
| Notocallista | Pitarinae | Veneridae | Veneroidea | Ovula | Ovulinae | Ovulidae | Cypraeoidea | |
| Notochlamys | Chlamydinae | Pectinidae | Pectinoidea | Oxycypraea | Cypraediinae | Cypraeidae | Cypraeoidea | |
| Notocorbula | Corbulinae | Corbulidae | Myoidea | Oxystele | Trochinae | Cirridae | Cirroidea | |
| Notocorbula | Caryocorbulinae | Corbulidae | Myoidea | |||||