Linda Pitkin / Grouper sheltering in Azure vase sponge (Callyspongia plicifera) Bonaire, Leeward Antilles, Caribbean.

Linda Pitkin / Azure vase sponge (Callyspongia plicifera) on coral reef, with small fish, Brown Chromis (Chromis multilineata) Bonaire, Leeward Antilles, Caribbean.

Pete Oxford / Azure vase sponge (Callyspongia plicifera) Hol Chan Marine Reserve, Belize.

Franco Banfi / Azure vase sponge (Callyspongia plicifera) and Common sea fan (Gorgonia ventalina) Santa Lucia, Camaguey, Cuba, Caribbean Sea, Atlantic Ocean

Georgette Douwma / Azure vase sponge (Callyspongia plicifera) Bonaire, Netherlands Antilles, Caribbean, Atlantic Ocean.

Georgette Douwma / Azure vase sponge (Callyspongia plicifera) Bonaire, Netherlands Antilles, Caribbean, Atlantic Ocean.

Georgette Douwma / Azure vase sponge (Callyspongia plicifera) Bonaire, Netherlands Antilles, Caribbean, Atlantic Ocean.

Georgette Douwma / Azure vase sponge (Callyspongia plicifera) Bonaire, Netherlands Antilles, Caribbean, Atlantic Ocean.

Georgette Douwma / Coral reef scenery with Orange elephant ear sponge (Agelas clathrodes), Stove-pipe sponge (Aplysina archeri) and Azure vase sponge (Callyspongia plicifera) Bonaire, Netherlands Antilles, Caribbean, A...

David Hall / Suenson's brittle star (Ophiothrix suensonii) on Azure vase sponge (Callyspongia plicifera), St. Vincent, Caribbean.