Michael Pitts / Mastigias jellyfish {Mastigias sp.} Palau, Western Pacific Islands

Jose B. Ruiz / Sponge {Ircinia fasciculata} and Neptune grass {Posidonia} Mediterranean. Spain

Constantinos Petrinos / Stove Pipe sponge {Aplysina archeri} Bonaire, Caribbean

Doug Perrine / Orange ball corallimorph {Pseudocorynactis caribbeorum} Grand Cayman, Caribbean Sea (Non-ex).

Doug Perrine / Warty corallimorph oral disk {Rhodactis osculifera / Discosoma sanctithomae} Caribbean Sea NB shrimp with red (Non-ex).

SINCLAIR STAMMERS / Adult round worms {Toxocara canis} parasitic nematodes, Magnified X 5

Jeff Rotman / Close up of Brain coral {Diplora strigosa} Caribbean

Jeff Rotman / Mushroom coral {Fungia sp.} Palau Islands, Pacific Ocean

Juergen Freund / Tube coral (Dendrophyllia) Philippines, Pacific Ocean

Georgette Douwma / Featherstar on seafan, Sulawesi, Indonesia.

Francis Abbott / Purple stinger jellyfish (Pelagia noctiluca) Mediterranean

Juergen Freund / Mushroom coral {Fungia sp.} skeleton from the Philippines