Smooth Periwinkle 
Snipe's Bill 
Soft-shelled Clam 
Sohgenia palauensis 
Solar-powered phyllodesmium 
Solaropsis gibboni 
Sooty Seahare 
Sordid Moon Snail 
Southern Reef Squid 
Spanish dancer 
Spanish Slug 
Speckled periwinkle 
Spectacular corolla 
Spengler's Trumpet Snail 
Sphincterochila prophetarum 
Sphincterochila zonata 
Spider conch 
Spinophallus falciphallus 
Spiny Fan Mussel 
Spotted sea hare 
Spotted Seahare 
Starry moon snail 
Starry night octopus 
Sthenoteuthis oualaniensis