Pete Oxford / Stove pipe Sponge (Aplysina archeri) Bonaire, Netherlands Antilles, Caribbean

Pete Oxford / Long-spine Porcupinefish (Diodon holocanthus) in Stove Pipe Sponge (Aplysina archeri), Bonaire, Netherlands Antilles, Caribbean

Jeff Rotman / Stove-Pipe Sponge (Aplysina archeri). Bahamas, Caribbean, Atlantic Ocean.

Peter Scoones / Stove pipe sponge group (Aplysina archeri) in reef scene. Bonaire, Netherlands Antilles, Caribbean, photographed during making of BBC Planet Earth series 2005

Peter Scoones / Stove pipe sponge (Aplysina archeri) Caribbean photographed during making of BBC Planet Earth series 2005

Roberto Rinaldi / Stove-pipe sponges (Aplysina archeri), Honduras.