Sabinea, Genus
Sagitta, Genus
Sagittidae, Familia
Salpa, Genus
Salpida, Ordo
Salpidae, Familia
Salpinae, Subfamilia
Sarsia, Genus
Schistomysis, Genus
Scina, Genus
Scinidae, Familia
Scinoidea, Superfamilia
Scyphomedusae, Classis
Scyphozoa, Superclass
sea squirt, Classis
– synonym of Ascidiacea, Classis
Semaeostomae, Ordo
Sepia, Genus
Sepiella, Genus
Sepietta, Genus
Sepiidae, Familia
Sepioidea, Ordo
Sepiola, Genus
Sepiolidae, Familia
Sepiolinae, Subfamilia
Sergestes, Genus
Sergestidae, Familia
Sergestoidea, Superfamilia
Sergia, Genus
Sididae, Familia
Siphonophora, Classis
Siriella, Genus
Siriellinae, Subfamilia
Skogsbergia, Genus
Soestia, Genus
Solmaridae, Familia
Solmaris, Genus
Spadella, Genus
Spadellidae, Familia
Spionida, Ordo
Spionidae, Familia
Spionoidea, Superfamilia
Spirontocaris, Genus
Spirularia, Subordo
Squillidae, Familia
Squilloidea, Superfamilia
Staurophora, Genus
Stenoteuthis, Genus
Stomatopoda, Ordo
Styliola, Genus
Stylocheiron, Genus
Sulculeolaria, Genus
Sulculeolariinae, Subfamilia
Synasterope, Genus
Systellapsis, Genus