• Rhabdomolgus ruber
• Solaster endeca Purple Sunstar
  
• Spatangus purpureus Purple Heart Urchin
  
• Stichastrella rosea Rosy Starfish
  
• Strongylocentrotus droebachiensis Northern Sea Urchin
  
• Thyone fusus
• Thyone inermis
• Thyonidium drummondii
• Thyonidium hyalinum