Sabanea binghamiana – synonym of Barleeia unifasciata
Sabanea consimilis – synonym of Pusillina inconspicua
Sabanea prismatica – synonym of Pusillina inconspicua
Sagittatus sagittatus – synonym of Todarodes sagittatus
Sanguinolaria californiana – synonym of Macoma balthica
Saxicava arctica var. abbreviata – synonym of Hiatella arctica
Saxicava arctica var. dilatata – synonym of Hiatella arctica
Saxicava arctica var. inermis – synonym of Hiatella arctica
Saxicava flaccida – synonym of Hiatella arctica
Saxicava fragilis – synonym of Saxicavella jeffreysi
Saxicava guerinii – synonym of Hiatella arctica
Saxicava norvegica – synonym of Panomya arctica
Saxicava orientalis – synonym of Hiatella arctica
Saxicava rubra – synonym of Hiatella arctica
Saxicava rugosa – synonym of Hiatella arctica
Saxicava sakhalinensis – synonym of Hiatella arctica
Saxicava striata – synonym of Hiatella arctica
Saxicava ungana – synonym of Hiatella arctica
Saxicavella plicata – synonym of Saxicavella jeffreysi
Scalaria planicosta – synonym of Epitonium turtonis
Scalaria tenuicosta – synonym of Epitonium turtonis
Scalaria tenuicostata – synonym of Epitonium turtonis
Scalaria trevelyana – synonym of Epitonium trevelyanum
Scalaria turtonae – synonym of Epitonium turtonis
Scaphander giganteus – synonym of Scaphander lignarius
Scaphander lignarius var. britannica – synonym of Scaphander lignarius
Scaphander lignarius var. minuscula – synonym of Scaphander lignarius
Scaphander lignarius var. norvegica – synonym of Scaphander lignarius
Scaphander targionius – synonym of Scaphander lignarius
Scissurella angulata – synonym of Anatoma crispata
Scissurella crispata var. paucicostata – synonym of Anatoma crispata
Scrobicularia arenaria – synonym of Scrobicularia plana
Scrobicularia curta – synonym of Abra alba
Scrobicularia nitida – synonym of Abra nitida
Scrobicularia piperata var. minor – synonym of Scrobicularia plana
Scrobicularia plana var. major – synonym of Scrobicularia plana
Scrobicularia plana var. obliqua – synonym of Scrobicularia plana
Scrobicularia plana var. solidiuscula – synonym of Scrobicularia plana
Scrobicularia prismatica – synonym of Abra prismatica
Scrobicularia rubiginosa – synonym of Scrobicularia plana
Scrobicularia tenuis – synonym of Abra nitida
Scrobiculinus strigosus var. depressa – synonym of Gibbula cineraria
Scrobiculinus strigosus var. elevata – synonym of Gibbula cineraria
Scrobiculinus strigosus var. rubra – synonym of Gibbula cineraria
Seguenzia elegans – synonym of Clelandella miliaris
Semele nitida var. panormensis – synonym of Abra nitida
Semele nitida var. sindima – synonym of Abra nitida
Semele nitida var. turgilla – synonym of Abra nitida
Semele piperata var. atterina – synonym of Scrobicularia plana
Semierycina nitida – synonym of Hemilepton nitidum
Semisalsa dalmatica – synonym of Semisalsa stagnorum
Semisalsa graeca – synonym of Semisalsa stagnorum
Semisalsa rausiana – synonym of Semisalsa stagnorum
Semperia paivana – synonym of Emarginula fissura
Sepia medius – synonym of Alloteuthis media
Sepiola macrosoma – synonym of Rossia macrosoma
Sepiola oweniana – synonym of Sepietta oweniana
Sepiola pfefferi – synonym of Sepiola aurantiaca
Septaria mediterranea – synonym of Nototeredo norvegica
Setia translucida – synonym of Rissoella diaphana
Sigaretus kindelaninus – synonym of Lamellaria perspicua
Similipecten similis – synonym of Hyalopecten similis
Simpulum nodiferum var. major – synonym of Charonia lampas
Simpulum nodiferum var. minor – synonym of Charonia lampas
Sipho gracilis – synonym of Colus gracilis
Sipho togatus var. frielei – synonym of Colus gracilis
Sipho turgidulus var. minor – synonym of Colus gracilis
Siphonodentalium subfusiforme – synonym of Cadulus subfusiformis
Siphonorbis marshalli – synonym of Colus jeffreysianus
Skenea divisa – synonym of Skenea serpuloides
Skenea nitens – synonym of Dikoleps pusilla
Skenea nitidissima – synonym of Omalogyra atomus
Skenea planorbis var. hyalina – synonym of Skeneopsis planorbis
Skenea planorbis var. maculata – synonym of Skeneopsis planorbis
Skenea planorbis var. trochiformis – synonym of Skeneopsis planorbis
Skenea rota – synonym of Ammonicera rota
Skeneia serpuliformis – synonym of Skenea serpuloides
Skeneia striatula – synonym of Circulus striatus
Skeneia trochiformis – synonym of Skeneopsis planorbis
Solecurtus albus – synonym of Solecurtus scopula
Solecurtus candidus – synonym of Solecurtus scopula
Solen albicans – synonym of Solecurtus scopula
Solen callosus – synonym of Scrobicularia plana
Solen candidus – synonym of Solecurtus scopula
Solen directus – synonym of Ensis americanus
Solen ensiformis – synonym of Ensis ensis
Solen ensis – synonym of Ensis ensis
Solen gallicus – synonym of Solecurtus scopula
Solen legumen – synonym of Pharus legumen
Solen ligulus – synonym of Ensis siliqua
Solen lux vespertinus – synonym of Gari depressa
Solen marginatus var. adusta – synonym of Solen marginatus
Solen marginatus var. major – synonym of Solen marginatus
Solen minutus – synonym of Hiatella arctica
Solen multistriatus – synonym of Solecurtus scopula
Solen novaculus – synonym of Ensis siliqua
Solen pellucidus – synonym of Phaxas pellucidus
Solen pinna – synonym of Pandora pinna
Solen pygmaeus – synonym of Phaxas pellucidus
Solen siliqua – synonym of Ensis siliqua
Solen siliqua minor – synonym of Ensis minor
Solen siliqua var. arcuata – synonym of Ensis arcuatus
Solen siliquosus – synonym of Ensis siliqua
Solen squamosus – synonym of Lepton squamosum
Solen strigilatus – synonym of Solecurtus scopula
Solen tenuis – synonym of Phaxas pellucidus
Solen vagina – synonym of Solen marginatus
Solen vespertinus – synonym of Gari depressa
Solen vesperus – synonym of Gari depressa
Solen violaceus – synonym of Gari depressa
Solenopus nitidulus – synonym of Neomenia carinata
Sphaerostoma aurantiacum – synonym of Tritonia plebeia
Sphaerostoma jamesoni – synonym of Tritonia hombergi
Sphenia bilirata – synonym of Hiatella arctica
Sphenia swainsoni – synonym of Mya truncata
Staurodoris verrucosa – synonym of Archidoris pseudoargus
Stenotis pallidula – synonym of Lacuna pallidula
Sthenoteuthis bartramii – synonym of Ommastrephes bartramii
Sthenoteuthis caroli – synonym of Ommastrephes bartramii
Stilifer turtoni – synonym of Pelseneeria minor
Stiliger amphibius – synonym of Alderia modesta
Stiliger bellulus – synonym of Calliopaea bellula
Stiliger modestus – synonym of Alderia modesta
Stiliger scaldianus – synonym of Alderia modesta
Strombiformis albus – synonym of Melanella alba
Strombiformis bilineata – synonym of Eulima bilineata
Strombiformis glaber – synonym of Eulima glabra
Strombiformis glabra – synonym of Eulima glabra
Strombiformis reticulatus – synonym of Bittium reticulatum
Strombiformis trifasciata – synonym of Eulima bilineata
Strombus norwegicus – synonym of Volutopsius norwegicus
Strombus pespelecani – synonym of Aporrhais pespelecani
Synapticola perrieri – synonym of Devonia perrieri
Syndesmya alba var. apesa – synonym of Abra alba
Syndesmya fragilis – synonym of Abra prismatica
Syndosmya alba var. major – synonym of Abra alba
Syndosmya boisyi – synonym of Abra alba
Syndosmya nucleolata – synonym of Abra tenuis
Syndosmya occitanica – synonym of Abra alba
Syndosmya tellinella – synonym of Abra longicallus
Syndosmya tenuis – synonym of Abra tenuis
Syndosmya truncata – synonym of Scrobicularia plana