Sanidastrella coronata – synonym of Ancorina radix
Sarcotragus spinosula – synonym of Sarcotragus spinosulus
Sarcotragus spinosulum – synonym of Sarcotragus spinosulus
Sclerilla arctica – synonym of Crella pyrula
Sclerilla dura – synonym of Crella pyrula
Scopalina madeirensis – synonym of Dictyonella madeirensis
Scopalina spinulenta – synonym of Iophon hyndmani
Scopalina toxotes – synonym of Clathria armata
Scypha ciliata – synonym of Sycon ciliatum
Scypha ciliata var. villosa – synonym of Sycon scaldiense
Scypha compressa – synonym of Grantia compressa
Scypha coronata – synonym of Sycon ciliatum
Scypha papillaris – synonym of Halichondria panicea
Scypha quadrangulata – synonym of Sycon quadrangulatum
Scypha scaldiensis – synonym of Sycon scaldiense
Seiriola compacta – synonym of Stryphnus ponderosus
Seriatula seriata – synonym of Clathria seriata
Sigmatoxella annexa – synonym of Desmacella annexa
Siphonochalina crassa – synonym of Haliclona simulans
Siphonochalina mollicula – synonym of Haliclona urceolus
Siphonochalina pulcherrima – synonym of Haliclona urceolus
Siphonochalina tubulosa – synonym of Halichondria panicea
Skeizia minuta – synonym of Monocrepidium minutum
Spongelia avara – synonym of Dysidea avara
Spongelia fragilis – synonym of Dysidea fragilis
Spongia ananas – synonym of Leuconia ananas
Spongia ananas – synonym of Sycon ciliatum
Spongia aurea – synonym of Hymeniacidon perlevis
Spongia botryoides – synonym of Leucosolenia botryoides
Spongia calyciformis – synonym of Axinella infundibuliformis
Spongia cancellata – synonym of Haliclona cinerea
Spongia carteri – synonym of Spongionella pulchella
Spongia ciliata – synonym of Sycon ciliatum
Spongia cinerea – synonym of Haliclona cinerea
Spongia coalita – synonym of Halichondria bowerbanki
Spongia coalita – synonym of Haliclona oculata
Spongia compacta – synonym of Halichondria panicea
Spongia complicata – synonym of Leucosolenia complicata
Spongia compressa – synonym of Grantia compressa
Spongia confervicola – synonym of Leucosolenia variabilis
Spongia contareni – synonym of Mycale contareni
Spongia coralloides – synonym of Clathria coralloides
Spongia coronata – synonym of Sycon ciliatum
Spongia cranium – synonym of Tetilla cranium
Spongia crateriformis – synonym of Axinella infundibuliformis
Spongia cristata – synonym of Halichondria panicea
Spongia damicornis – synonym of Axinella damicornis
Spongia dichotoma – synonym of Antho dichotoma
Spongia dichotoma – synonym of Haliclona oculata
Spongia digitata – synonym of Haliclona oculata
Spongia digitata – synonym of Isodictya palmata
Spongia fasciculata – synonym of Ircinia fasciculata
Spongia foliacea – synonym of Grantia compressa
Spongia fragilis – synonym of Dysidea fragilis
Spongia fruticosa – synonym of Desmacidon fruticosum
Spongia fucorum – synonym of Esperiopsis fucorum
Spongia hispida – synonym of Raspailia hispida
Spongia infundibuliformis – synonym of Axinella infundibuliformis
Spongia limbata – synonym of Acervochalina limbata
Spongia lobata – synonym of Isodictya palmata
Spongia oculata – synonym of Haliclona oculata
Spongia palmata – synonym of Isodictya palmata
Spongia panicea – synonym of Halichondria panicea
Spongia pannea – synonym of Myxilla incrustans
Spongia papillaris – synonym of Halichondria panicea
Spongia parasitica – synonym of Esperiopsis fucorum
Spongia perlevis – synonym of Hymeniacidon perlevis
Spongia pilosa – synonym of Tetilla cranium
Spongia plumosa – synonym of Phorbas plumosus
Spongia pocillum – synonym of Axinella infundibuliformis
Spongia pulchella – synonym of Spongionella pulchella
Spongia pulverulenta – synonym of Leuconia ananas
Spongia rigida – synonym of Stelligera rigida
Spongia scypha – synonym of Phakellia ventilabrum
Spongia seriata – synonym of Clathria seriata
Spongia stuposa – synonym of Stelligera stuposa
Spongia suberia – synonym of Suberites suberia
Spongia sulphurea – synonym of Cliona celata
Spongia terebrans – synonym of Cliona celata
Spongia tomentosa – synonym of Halichondria panicea
Spongia tubulosa – synonym of Halichondria panicea
Spongia tubulosa – synonym of Haliclona cinerea
Spongia urceolus – synonym of Haliclona urceolus
Spongia urens – synonym of Halichondria panicea
Spongia urtica – synonym of Halichondria panicea
Spongia ventilabra – synonym of Phakellia ventilabrum
Spongia ventilabrum – synonym of Phakellia ventilabrum
Spongia verrucosa – synonym of Axinella verrucosa
Spongia verrucosa – synonym of Tethya aurantium
Spongosorites placenta – synonym of Spongosorites genitrix
Spuma borealis tuberosa – synonym of Halichondria panicea
Spuma borealis velamentosa – synonym of Halichondria panicea
Stelletta aspera – synonym of Stryphnus ponderosus
Stelletta collingsi – synonym of Stelletta grubii
Stelletta discophora – synonym of Erylus discophorus
Stelletta fortis – synonym of Stryphnus fortis
Stelletta grubei – synonym of Stelletta grubii
Stelletta immunda – synonym of Ancorina cerebrum
Stelletta wageneri – synonym of Ancorina cerebrum
Stelligera stuposa forma rigida – synonym of Stelligera rigida
Stelligera stuposa forma stuposa – synonym of Stelligera stuposa
Stryphnus pondersosus rudis – synonym of Stryphnus ponderosus
Stylinos uniformis – synonym of Esperiopsis fucorum
Stylostichon dives – synonym of Phorbas dives
Stylostichon microcheliferum – synonym of Phorbas microchelifer
Stylostichon plumosum – synonym of Phorbas plumosus
Stylotella (Perisinella) madeirensis – synonym of Dictyonella madeirensis
Stylotella columella – synonym of Hemimycale columella
Stylotella pelligera – synonym of Dictyonella pelligera
Stylotella uniformis – synonym of Esperiopsis fucorum
Suberites aaptos – synonym of Aaptos aaptos
Suberites arciger – synonym of Artemisina arciger
Suberites domuncula – synonym of Suberites ficus
Suberites domuncula – synonym of Suberites suberia
Suberites domuncula – synonym of Suberites virgultosus
Suberites elongatus – synonym of Rhizaxinella elongata
Suberites epiphytum – synonym of Prosuberites epiphytum
Suberites firmus – synonym of Halichondria panicea
Suberites flavus – synonym of Suberites massa
Suberites griffithsii – synonym of Cliona celata
Suberites luetkeni – synonym of Suberites virgultosus
Suberites luetkeni var. spermatozoon – synonym of Suberites virgultosus
Suberites montalbidus – synonym of Suberites ficus
Suberites spermatozoon – synonym of Suberites ficus
Suberites spissus – synonym of Aaptos aaptos
Suberites suberea – synonym of Suberites suberia
Suberites sulphurea – synonym of Pseudosuberites sulphureus
Sycaltis ovipara – synonym of Amphoriscus oviparus
Sycandra capillosa – synonym of Grantia capillosa
Sycandra ciliata – synonym of Sycon ciliatum
Sycandra ciliata var. coronata – synonym of Sycon ciliatum
Sycandra compressa – synonym of Grantia compressa
Sycandra coranata var. spinispiculum – synonym of Sycon ciliatum
Sycandra coronata – synonym of Sycon ciliatum
Sycandra raphanus – synonym of Sycon raphanus
Sycandra villosa – synonym of Sycon villosum
Sycettusa glacialis – synonym of Amphiute paulini
Sycinula aspera – synonym of Leuconia aspera
Sycon capillosum – synonym of Grantia capillosa
Sycon compressum – synonym of Grantia compressa
Sycon coronatum – synonym of Sycon ciliatum
Syconella quadrangulata – synonym of Sycon quadrangulatum
Sycorrhiza corallorhiza – synonym of Leucosolenia variabilis
Sycortis quadrangulata – synonym of Sycon quadrangulatum
Sycurus oviparus – synonym of Amphoriscus oviparus