Opinions from R. L. Squires 1984
- 'Acanthocardia belongs to Cardiinae'
- 'Acila belongs to Nuculidae'
- 'Acila (Truncacila) belongs to Acila'
- 'Acila gabbiana belongs to Acila' according to Dickerson 1916
- 'Acila gabbiana is a subjective synonym of Acila (Truncacila) decisa'
- 'Acila lajollaensis is a subjective synonym of Acila (Truncacila) decisa'
- 'Admetula was reranked as Bonellitia (Admetula) and belongs to Bonellitia'
- 'Amaurellina (Euspirocrommium) clarki is recombined as Pachycrommium clarki'
- 'Amaurellina hendoni is a subjective synonym of Tejonia moragai'
- 'Amaurellina moragai is recombined as Tejonia moragai'
- 'Amaurellina moragai lajollaensis is recombined as Tejonia lajollaensis' according to Hanna and Hertlein 1943
- 'Tejonia lajollaensis is a subjective synonym of Tejonia moragai'
- 'Ampullospirinae belongs to Naticidae'
- 'Ancilla belongs to Olivinae'
- 'Ancilla (Oliverato) belongs to Ancilla'
- 'Ancilla (Oliverato) californica is recombined as Cryptochorda (Cryptochorda) californica'
- 'Ancilla gabbi belongs to Ancilla' according to Cossman 1899
- 'Ancilla gabbi is recombined as Ancilla (Spirancilla) gabbi'
- 'Ancillaria elongata is replaced by Ancilla gabbi' according to Cossman 1899
- 'Ancistrolepis belongs to Buccinidae'
- 'Ancistrolepis carolineae belongs to Ancistrolepis'
- 'Anomalodesmata belongs to Bivalvia'
- 'Anomia belongs to Anomiidae'
- 'Anomia mcgoniglensis belongs to Anomia'
- 'Anomiacea belongs to Pteriina'
- 'Anomiidae belongs to Anomiacea'
- 'Anthozoa belongs to Cnidaria'
- 'Archaeogastropoda belongs to Prosobranchia'
- 'Architectonica belongs to Architectonicidae'
- 'Architectonica (Architectonica) belongs to Architectonica'
- 'Architectonica cognata is recombined as Architectonica (Stellaxis) cognata'
- 'Architectonica llajasensis is recombined as Architectonica (Architectonica) llajasensis'
- 'Architectonicidae belongs to Cerithiacea'
- 'Arcoida belongs to Pteriomorpha'
- 'Articulata belongs to Brachiopoda'
- 'Astarte semidentata is a subjective synonym of Crassatella uvasana'
- 'Atelostomata belongs to Euechinoidea'
- 'Aturia belongs to Aturiidae'
- 'Aturia myrli is corrected as Aturia myrlae and belongs to Aturia'
- 'Aturiidae belongs to Nautilacea'
- 'Axinaea (Limopsis) sagittata is recombined as Glycymeris (Glycymerita) sagittata'
- 'Benoistea is corrected as Benoistia and belongs to Cerithiinae'
- 'Benoistia umpquaensis belongs to Benoistia' according to Turner 1938
- 'Bivalvia belongs to Mollusca'
- 'Bonellitia belongs to Cancellariidae'
- 'Brachidontes belongs to Mytilidae'
- 'Brachidontes (Brachidontes) belongs to Brachidontes'
- 'Brachyrhyncha belongs to Brachyura'
- 'Brachyuri is corrected as Brachyura and belongs to Pleocyemata'
- 'Buccinacea belongs to Neogastropoda'
- 'Buccinidae belongs to Muricacea'
- 'Bullaea gabbiana belongs to Bullaea' according to Stoliczka 1868
- 'Bullaea gabbiana is recombined as Megistostoma gabbianum'
- 'Bullia (Molopophorus) was reranked as Molopophorus and belongs to Nassariidae'
- 'Bursidae belongs to Tonnacea'
- 'Busycon blakei is recombined as Pseudoperissolax blakei'
- 'Callista belongs to Pitarinae'
- 'Callocardia belongs to Pitarinae'
- 'Callocardia (Nitidavenus) belongs to Callocardia'
- 'Calyptraea belongs to Calyptraeidae'
- 'Calyptraea calabasaensis is a subjective synonym of Calyptraea diegoana'
- 'Calyptraeacea belongs to Mesogastropoda'
- 'Calyptraeidae belongs to Calyptraeacea'
- 'Cancellariidae belongs to Volutacea'
- 'Carcinoplacinae belongs to Goneplacidae'
- 'Cardiacea belongs to Veneroida'
- 'Cardiidae belongs to Cardiacea'
- 'Cardiinae belongs to Cardiidae'
- 'Cardiomya belongs to Cuspidariidae'
- 'Cardita hornii is recombined as Venericardia (Pacificor) hornii'
- 'Carditacea belongs to Veneroida'
- 'Carditesinae belongs to Carditidae'
- 'Carditidae belongs to Carditacea'
- 'Cardium brewerii is recombined as Acanthocardia (Schedocardia) brewerii'
- 'Cardium cooperii is a subjective synonym of Nemocardium linteum'
- 'Cardium dalli is a subjective synonym of Nemocardium linteum'
- 'Cardium linteum is recombined as Nemocardium linteum'
- 'Cardium marysvillensis is a subjective synonym of Nemocardium linteum'
- 'Carophylliina is corrected as Caryophylliina and belongs to Scleractinia'
- 'Caryophylliicae belongs to Caryophylliina'
- 'Caryophylliidae belongs to Caryophylliicae'
- 'Caryophylliinae belongs to Caryophylliidae'
- 'Cassididae belongs to Tonnacea'
- 'Cephalaspidea belongs to Euthyneura'
- 'Cephalopoda belongs to Mollusca'
- 'Cerithiacea belongs to Mesogastropoda'
- 'Cerithiadae is corrected as Cerithiidae and belongs to Cerithiacea'
- 'Cerithiinae belongs to Cerithiidae'
- 'Cerithiopsidae belongs to Cerithiacea'
- 'Cerithiopsis belongs to Cerithiopsidae'
- 'Cerithiopsis llajasensis belongs to Cerithiopsis'
- 'Chondrichthyes belongs to Chordata'
- 'Cirsotrema belongs to Epitoniidae'
- 'Claibornites belongs to Milthinae'
- 'Clavatula californica is recombined as Fusus californicus' according to Gabb 1864
- 'Clavella tabulata is recombined as Clavilithes tabulatus'
- 'Clavilithes belongs to Fasciolariidae'
- 'Cnidaria was reranked as a subphylum and belongs to Coelenterata'
- 'Coleoidea belongs to Cephalopoda'
- 'Conacea belongs to Neogastropoda'
- 'Conidae belongs to Conacea'
- 'Conus belongs to Conidae'
- 'Conus caleocius belongs to Conus'
- 'Conus hornii belongs to Conus'
- 'Conus hornii umpquaensis belongs to Conus hornii'
- 'Corbula belongs to Corbulinae'
- 'Corbula (Caryocorbula) belongs to Corbula'
- 'Corbula dickersoni is recombined as Corbula (Caryocorbula) dickersoni'
- 'Corbulidae belongs to Myacea'
- 'Corbulinae belongs to Corbulidae'
- 'Costacallista was reranked as Callista (Costacallista) and belongs to Callista'
- 'Crassatella belongs to Crassatellinae'
- 'Crassatella uvasana belongs to Crassatella'
- 'Crassatellacea belongs to Veneroida'
- 'Crassatellidae belongs to Crassatellacea'
- 'Crassatellinae belongs to Crassatellidae'
- 'Crassatella grandis is a subjective synonym of Crassatella uvasana'
- 'Crenaturricula was reranked as Fusiturricula (Crenaturricula) and belongs to Fusiturricula'
- 'Cryptochorda belongs to Volutinae'
- 'Cryptochorda (Cryptochorda) belongs to Cryptochorda' according to Mörch 1858
- 'Cryptochorda (Cryptochorda) belongs to Cryptochorda'
- 'Cuspidaria russelli is recombined as Cardiomya russelli'
- 'Cuspidariidae belongs to Poromyacea'
- 'Cylichna costata is recombined as Scaphander (Mirascapha) costatus'
- 'Cylichnacea belongs to Cephalaspidea'
- 'Cylichnella tantilla is recombined as Cylichnina tantilla'
- 'Cylichnidae belongs to Cylichnacea'
- 'Cylichnina belongs to Cylichnidae'
- 'Cymatiidae belongs to Tonnacea'
- 'Cymatium belongs to Cymatiidae'
- 'Cymatium (Septa) janetae belongs to Cymatium (Septa)'
- 'Cypraea belongs to Cypraeinae'
- 'Cypraea castacensis belongs to Cypraea'
- 'Cypraeacea belongs to Mesogastropoda'
- 'Cypraeidae belongs to Cypraeacea'
- 'Cypraeinae belongs to Cypraeidae'
- 'Decapoda belongs to Eumalacostraca'
- 'Dentaliidae belongs to Scaphopoda'
- 'Dentalium belongs to Dentaliidae'
- 'Dentalium (Laevidentalium) belongs to Dentalium'
- 'Dentalium (Laevidentalium) calafium belongs to Dentalium (Laevidentalium)'
- 'Dentalium stentor belongs to Dentalium' according to Anderson and Hanna 1925
- 'Dentalium stentor belongs to Dentalium'
- 'Discocyclinidae belongs to Orbitoidacea'
- 'Domenginella belongs to Turriculinae'
- 'Dosinia bunkeri is recombined as Marcia (Mercimonia) bunkeri'
- 'Echinozoa belongs to Echinodermata'
- 'Echinus was reranked as the class Echinoidea and belongs to Echinozoa'
- 'Ectinochilus belongs to Strombidae'
- 'Ectinochilus (Macilentos) belongs to Ectinochilus'
- 'Elasmobranchii belongs to Chondrichthyes'
- 'Eocernina belongs to Ampullospirinae'
- 'Eocithara belongs to Harpidae'
- 'Eocithara mutica californiensis belongs to Eocithara mutica' according to Vokes 1937
- 'Eocithara mutica californiensis belongs to Eocithara mutica'
- 'Eogryphus belongs to Terebratulida'
- 'Eogryphus tolmani belongs to Eogryphus'
- 'Epitoniacea belongs to Mesogastropoda'
- 'Epitoniidae belongs to Epitoniacea'
- 'Euechinoidea belongs to Echinoidea'
- 'Eumalacostraca belongs to Malacostraca'
- 'Euspira was reranked as Polinices (Euspira) and belongs to Polinices'
- 'Euthyneura belongs to Gastropoda'
- 'Exilia belongs to Turriculinae'
- 'Exilia llajasensis belongs to Exilia' according to Bentson 1940
- 'Exilia llajasensis belongs to Exilia'
- 'Exputens was reranked as Nayadina (Exputens) and belongs to Nayadina'
- 'Exputens llajasensis is recombined as Nayadina (Exputens) llajasensis'
- 'Fasciolariidae belongs to Buccinacea'
- 'Ficidae belongs to Tonnacea'
- 'Ficopsis belongs to Ficidae'
- 'Ficopsis remondii crescentensis belongs to Ficopsis remondii' according to Weaver and Palmer 1922
- 'Foraminifera was reranked as the order Foraminiferida and belongs to Granuloreticulosia'
- 'Fulgorariinae belongs to Volutidae'
- 'Fusininae belongs to Fasciolariidae'
- 'Fusinus belongs to Fusininae'
- 'Fusinus teglandi is corrected as Fusinus teglandae and belongs to Fusinus'
- 'Fusinus ucalius belongs to Fusinus'
- 'Fusiturricula belongs to Turriculinae'
- 'Fusus (Hemifusus) cooperii is replaced by Ficopsis cooperiana'
- 'Fusus mathewsonii is recombined as Surculites mathewsonii'
- 'Galeodea belongs to Cassididae'
- 'Galeodea (Caliagaleodea) belongs to Galeodea'
- 'Galeodea (Caliagaleodea) californica belongs to Galeodea (Caliagaleodea)'
- 'Galeodea (Gomphopages) belongs to Galeodea'
- 'Galeodea susanae is recombined as Galeodea (Gomphopages) susanae'
- 'Galerus excentricus is a subjective synonym of Calyptraea diegoana'
- 'Gari belongs to Psammobiinae'
- 'Gari eoundulata belongs to Gari'
- 'Gastropoda belongs to Mollusca'
- 'Glycimeris hannibali is a subjective synonym of Glycymeris (Glycymerita) sagittata'
- 'Glycymerididae belongs to Limnopsacea'
- 'Glycymeridinae belongs to Glycymerididae'
- 'Glycymeris belongs to Glycymeridinae'
- 'Glycymeris (Glycymeris) belongs to Glycymeris'
- 'Glycymeris rosecanyonensis is recombined as Glycymeris (Glycymeris) rosecanyonensis'
- 'Glycymerita was reranked as Glycymeris (Glycymerita) and belongs to Glycymeris'
- 'Glyphithyreus belongs to Carcinoplacinae'
- 'Glyptoactis (Glyptoactis) belongs to Glyptoactis'
- 'Goneplacidae belongs to Xanthoidea'
- 'Granuloreticulosea [misspelled as Granuloreticulosia] belongs to Rhizopodea'
- 'Harpa mutica is recombined as Eocithara mutica'
- 'Harpidae belongs to Volutacea'
- 'Hemiasterina belongs to Spatangoida'
- 'Heterodonta belongs to Bivalvia'
- 'Isocardia tejonensis is recombined as Callocardia (Nitidavenus) tejonensis'
- 'Isurus belongs to Lamnidae'
- 'Isurus praecursor belongs to Isurus'
- 'Laevityphis belongs to Muricinae'
- 'Laevityphis (Laevityphis) belongs to Laevityphis'
- 'Lamnidae belongs to Lamniformes'
- 'Lamniformes belongs to Elasmobranchii'
- 'Leda vaderensis is a subjective synonym of Nuculana (Saccella) gabbii'
- 'Leda vogdesi belongs to Leda' according to Anderson and Hanna 1925
- 'Leda vogdesi is a subjective synonym of Nuculana (Saccella) gabbii'
- 'Limopsacea [misspelled as Limnopsacea] belongs to Arcoida'
- 'Lucina diegoensis is recombined as Claibornites diegoensis'
- 'Lucinacea belongs to Veneroida'
- 'Lucinidae belongs to Lucinacea'
- 'Lunatia cowlitzensis is a subjective synonym of Polinices (Euspira) nuciformis'
- 'Lunatia nuciformis is recombined as Polinices (Euspira) nuciformis'
- 'Lyria belongs to Volutinae'
- 'Lyria andersoni belongs to Lyria'
- 'Lyrischapa belongs to Fulgorariinae'
- 'Macoma belongs to Macominae'
- 'Macoma rosa belongs to Macoma'
- 'Macominae belongs to Tellinidae'
- 'Malacostraca was reranked as a class and belongs to Arthropoda'
- 'Malleidae belongs to Pteriacea'
- 'Marcia belongs to Tapetinae'
- 'Megistostoma belongs to Philinidae'
- 'Megistostoma caminoensis is a subjective synonym of Megistostoma gabbianum'
- 'Megistostoma striata is replaced by Bullaea gabbiana' according to Stoliczka 1868
- 'Mercimonia was reranked as Marcia (Mercimonia) and belongs to Marcia'
- 'Meretrix hornii is recombined as Callista (Costacallista) hornii'
- 'Meretrix uvasana is recombined as Pitar (Calpitaria) uvasana'
- 'Mesogastropoda belongs to Prosobranchia'
- 'Milthinae belongs to Lucinidae'
- 'Mitra cretacea is recombined as Proximitra cretacea'
- 'Mitridae belongs to Volutacea'
- 'Modiolus (Brachydontes) cowlitzensis is recombined as Brachidontes (Brachidontes) cowlitzensis'
- 'Morio (Sconsia) tuberculatus is recombined as Phalium (Semicassis) tuberculiformis'
- 'Muricacea belongs to Neogastropoda'
- 'Muricidae belongs to Muricacea'
- 'Muricinae belongs to Muricidae'
- 'Myacea belongs to Myina'
- 'Myina belongs to Myoida'
- 'Myoida belongs to Heterodonta'
- 'Mytilacea belongs to Mytiloida'
- 'Mytilidae belongs to Mytilacea'
- 'Mytiloida belongs to Pteriomorpha'
- 'Nassa cretacea is recombined as Molopophorus cretaceus'
- 'Nassariidae belongs to Buccinacea'
- 'Natica belongs to Naticinae'
- 'Natica hannibali is recombined as Eocernina hannibali'
- 'Natica uvasana is recombined as Natica (Naticarius) uvasana'
- 'Naticacea belongs to Mesogastropoda'
- 'Naticarius was reranked as Natica (Naticarius) and belongs to Naticacea'
- 'Naticidae belongs to Naticacea'
- 'Naticina obliqua is recombined as Sinum obliquum'
- 'Naticinae belongs to Naticidae'
- 'Nautilaceae is corrected as Nautilacea and belongs to Nautilida'
- 'Nautilida belongs to Nautiloidea'
- 'Nautiloidea belongs to Cephalopoda'
- 'Nayadina belongs to Malleidae'
- 'Nemocardium belongs to Protocardiinae'
- 'Neogastropoda belongs to Prosobranchia'
- 'Nerita belongs to Neritinae'
- 'Nerita (Amphinerita) belongs to Nerita'
- 'Nerita (Amphinerita) eorex belongs to Nerita (Amphinerita)'
- 'Nerita perversa is recombined as Velates perversus'
- 'Neritacea belongs to Archaeogastropoda'
- 'Neritidae belongs to Neritacea'
- 'Neritinae belongs to Neritidae'
- 'Neverita belongs to Polinicinae'
- 'Neverita (Neverita) belongs to Neverita'
- 'Neverita globosa is recombined as Neverita (Neverita) globosa'
- 'Neverita globosa reefensis belongs to Neverita globosa' according to Vokes 1939
- 'Neverita globosa reefensis is a subjective synonym of Neverita (Neverita) globosa'
- 'Neverita nomlandi is a subjective synonym of Neverita (Neverita) globosa'
- 'Neverita weaveri is a subjective synonym of Neverita (Neverita) globosa'
- 'Nucula (Acila) stillwaterensis is a subjective synonym of Acila (Truncacila) decisa'
- 'Nucula decisa is recombined as Acila (Truncacila) decisa'
- 'Nuculacea belongs to Nuculoida'
- 'Nuculana belongs to Nuculanidae'
- 'Nuculana gabbii is recombined as Nuculana (Saccella) gabbii'
- 'Nuculanacea belongs to Nuculoida'
- 'Nuculanidae belongs to Nuculanacea'
- 'Nuculidae belongs to Nuculacea'
- 'Nuculoida belongs to Palaeotaxodonta'
- 'Odontaspididae belongs to Lamniformes'
- 'Odontaspis belongs to Odontaspididae'
- 'Olequahia belongs to Bursidae'
- 'Olivella belongs to Olivinae'
- 'Olivella mathewsonii belongs to Olivella'
- 'Olividae belongs to Volutacea'
- 'Olivinae belongs to Olividae'
- 'Orbitoidacea belongs to Rotaliina'
- 'Orthophragmina clarki belongs to Orthophragmina' according to Cushman 1920
- 'Orthophragmina clarki is recombined as Pseudophragmina (Proporocyclina) clarki'
- 'Ostrea belongs to Ostreinae'
- 'Ostrea idriaensis belongs to Ostrea'
- 'Ostreacea belongs to Ostreina'
- 'Ostreidae belongs to Ostreacea'
- 'Ostreina belongs to Pterioida'
- 'Ostreinae belongs to Ostreidae'
- 'Pachycrommium belongs to Ampullospirinae'
- 'Palaeotaxodonta belongs to Bivalvia'
- 'Paraseraphs belongs to Seraphsidae'
- 'Pectinacea belongs to Pteriina'
- 'Pejona lajollaensis is recombined as Lyrischapa lajollaensis'
- 'Phalium belongs to Cassididae'
- 'Philinidae belongs to Cylichnacea'
- 'Pholadacea belongs to Pholadina'
- 'Pholadina belongs to Myoida'
- 'Pholadomyoida belongs to Anomalodesmata'
- 'Pinna belongs to Pinnidae'
- 'Pinna lewisi belongs to Pinna'
- 'Pinna llajasensis belongs to Pinna'
- 'Pinnacea belongs to Mytiloida'
- 'Pinnidae belongs to Pinnacea'
- 'Pitar belongs to Pitarinae'
- 'Pitar (Calpitaria) belongs to Pitar'
- 'Pitar (Lamelliconcha) belongs to Pitar'
- 'Pitar (Lamelliconcha) joaquinensis belongs to Pitar (Lamelliconcha)'
- 'Pitarinae belongs to Veneridae'
- 'Plagiocardium (Schedocardia) is reassigned into Acanthocardia'
- 'Plagiolophus weaveri belongs to Plagiolophus' according to Rathbun 1926
- 'Plagiolophus weaveri is recombined as Glyphithyreus weaveri'
- 'Pleocyemata belongs to Decapoda'
- 'Pleurotoma (Pleurofusia) was reranked as Pleurofusia and belongs to Turriculinae'
- 'Pleurotoma decipiens is a subjective synonym of Surculites mathewsonii'
- 'Polinices belongs to Polinicinae'
- 'Polinicinae belongs to Naticidae'
- 'Polychaeta [misspelled as Polychaetia] belongs to Annelida'
- 'Poromyacea belongs to Pholadomyoida'
- 'Potamides davisiana is a subjective synonym of Surculites mathewsonii'
- 'Prosobranchia belongs to Gastropoda'
- 'Protocardiinae belongs to Cardiidae'
- 'Proximitra belongs to Vexillinae'
- 'Psammobiidae belongs to Tellinacea'
- 'Psammobiinae belongs to Psammobiidae'
- 'Pseudoliva belongs to Olividae'
- 'Pseudoliva lineata belongs to Pseudoliva'
- 'Pseudoperissolax belongs to Tudiclidae'
- 'Pseudophragmina belongs to Discocyclinidae'
- 'Pseudophragmina (Proporocyclina) belongs to Pseudophragmina' according to Vaughn and Cole 1940
- 'Pseudophragmina (Proporocyclina) belongs to Pseudophragmina'
- 'Pteriacea belongs to Pteriina'
- 'Pteriina belongs to Pterioida'
- 'Pterioida belongs to Pteriomorpha'
- 'Pteriomorpha belongs to Bivalvia'
- 'Ranella belongs to Cymatiidae'
- 'Ranella domenginica is recombined as Olequahia domenginica'
- 'Ranella katherineae belongs to Ranella'
- 'Ranellina belongs to Bursidae'
- 'Ranellina pilsbryi belongs to Ranellina'
- 'Ranellina pilsbryi belongs to Ranellina' according to Stewart 1927
- 'Rhizopodea belongs to Sarcodina'
- 'Rimella macilenta is recombined as Ectinochilus (Macilentos) macilentus'
- 'Rotaliina belongs to Foraminiferida'
- 'Rotularia belongs to Serpulidae'
- 'Saccella was reranked as Nuculana (Saccella) and belongs to Nuculanacea'
- 'Sarcodina belongs to Protista'
- 'Scaphander belongs to Cylichnidae'
- 'Scaphander (Mirascapha) belongs to Scaphander'
- 'Scaphopoda belongs to Mollusca'
- 'Schizaster belongs to Schizasteridae'
- 'Schizaster diabloensis belongs to Schizaster'
- 'Schizasterinae was reranked as the family Schizasteridae and belongs to Hemiasterina'
- 'Scleractinia belongs to Zoantharia'
- 'Sedentaria was reranked as a order and belongs to Polychaetia'
- 'Semicassis was reranked as Phalium (Semicassis) and belongs to Phalium'
- 'Sepiida belongs to Coleoidea'
- 'Septa was reranked as Cymatium (Septa) and belongs to Cymatium'
- 'Seraphsidae belongs to Strombacea'
- 'Serpulidae belongs to Sedentaria'
- 'Sininae belongs to Naticidae'
- 'Sinum belongs to Sininae'
- 'Sinum coryliforme belongs to Sinum' according to Anderson and Hanna 1925
- 'Sinum coryliforme is a subjective synonym of Sinum obliquum'
- 'Sinum occidentis belongs to Sinum' according to Weaver and Palmer 1922
- 'Sinum occidentis is a subjective synonym of Sinum obliquum'
- 'Solen novacula is recombined as Solena (Eosolen) navacularis'
- 'Solen novacula is replaced by Solen novacularis' according to Anderson and Hanna 1928
- 'Solen novacularis belongs to Solen' according to Anderson and Hanna 1928
- 'Solena belongs to Solenidae'
- 'Solena (Eosolen) belongs to Solena'
- 'Solena (Eosolen) coosensis belongs to Solena (Eosolen)' according to Turner 1938
- 'Solena (Eosolen) coosensis is a subjective synonym of Solena (Eosolen) navacularis'
- 'Solenacea belongs to Veneroida'
- 'Solenidae belongs to Solenacea'
- 'Spatangoida belongs to Atelostomata'
- 'Spirancilla was reranked as Ancilla (Spirancilla) and belongs to Ancilla'
- 'Spiroglyphus tejonensis is recombined as Rotularia tejonense'
- 'Spondylidae belongs to Pectinacea'
- 'Spondylus belongs to Spondylidae'
- 'Spondylus carlosensis belongs to Spondylus'
- 'Stellaxis was reranked as Architectonica (Stellaxis) and belongs to Architectonica'
- 'Strepsidura belongs to Olividae'
- 'Strombacea belongs to Mesogastropoda'
- 'Strombidae belongs to Strombacea'
- 'Surcula crenatospira is recombined as Fusiturricula (Crenaturricula) crenatospira'
- 'Surcula gesteri is a subjective synonym of Domenginella claytonensis'
- 'Surculites belongs to Turriculinae'
- 'Tapetinae belongs to Veneridae'
- 'Tejonia belongs to Ampullospirinae'
- 'Tellinacea belongs to Veneroida'
- 'Tellinidae belongs to Tellinacea'
- 'Terebellum californicum is a subjective synonym of Paraseraphs erraticus'
- 'Terebra belongs to Terebridae'
- 'Terebra californica belongs to Terebra'
- 'Terebratulida belongs to Articulata'
- 'Terebridae belongs to Conacea'
- 'Teredinidae belongs to Pholadacea'
- 'Teredininae belongs to Teredinidae'
- 'Teredo belongs to Teredininae'
- 'Tonnacea belongs to Mesogastropoda'
- 'Tornatina erratica is recombined as Paraseraphs erraticus'
- 'Tornatina erratica is recombined as Terebellum (Terebellum) erraticum' according to Kleinpell and Weaver 1963
- 'Tritonium paucivaricatum is recombined as Bonellitia (Admetula) paucivaricatum'
- 'Trochita diegoana is recombined as Calyptraea diegoana'
- 'Trochocyathus belongs to Caryophylliinae'
- 'Trochosmilia (Acrosmilia) striata is recombined as Trochocyathus striatus'
- 'Tudiclidae belongs to Volutacea'
- 'Turbinolia belongs to Turbinoliinae'
- 'Turbinolia dickersoni belongs to Turbinolia'
- 'Turbinoliinae belongs to Caryophylliidae'
- 'Turriculinae belongs to Turridae'
- 'Turridae belongs to Conacea'
- 'Turris claytonensis is recombined as Domenginella claytonensis'
- 'Turritella belongs to Turritellidae'
- 'Turritella andersoni belongs to Turritella'
- 'Turritella applini is recombined as Turritella uvasana applinae'
- 'Turritella buwaldana belongs to Turritella'
- 'Turritella kewi is a subjective synonym of Turritella buwaldana'
- 'Turritella lawsoni is recombined as Turritella andersoni lawsoni'
- 'Turritella meganosensis belongs to Turritella'
- 'Turritella meganosensis protumescens belongs to Turritella meganosensis'
- 'Turritella uvasana belongs to Turritella'
- 'Turritella uvasana infera belongs to Turritella uvasana'
- 'Turritellidae belongs to Cerithiacea'
- 'Typhis antiquus is recombined as Laevityphis (Laevityphis) antiquus'
- 'Velates belongs to Neritinae'
- 'Veneracea belongs to Veneroida'
- 'Venericardia belongs to Venericardiinae'
- 'Venericardia (Glyptoactis) was reranked as Glyptoactis and belongs to Carditesinae'
- 'Venericardia (Glyptoactis) domenginica is recombined as Glyptoactis (Glyptoactis) domenginica'
- 'Venericardia (Pacificor) belongs to Venericardia'
- 'Venericardia hornii aragonia is recombined as Venericardia (Pacificor) aragonia'
- 'Venericardiinae belongs to Carditidae'
- 'Veneridae belongs to Veneracea'
- 'Veneroida belongs to Heterodonta'
- 'Vexillinae belongs to Mitridae'
- 'Volutacea belongs to Neogastropoda'
- 'Volutidae belongs to Volutacea'
- 'Volutinae belongs to Volutidae'
- 'Whitneya ficus is recombined as Strepsidura ficus'
- 'Xanthoidea belongs to Brachyrhyncha'
- 'Xenophora belongs to Xenophoridae'
- 'Xenophora stocki belongs to Xenophora'
- 'Xenophoridae belongs to Calyptraeacea'
- 'Zoantharia belongs to Anthozoa'