Georgette Douwma / Barrel Sponge (Xestospongia testudinaria) on coral reef with soft corals (Scleronephthya sp), gorgonian and Lyretail anthias (Pseudanthias squamipinnis). Komodo National Park, Indonesia.

Juergen Freund / Massive barrel sponge (Xestospongia testudinaria) and diver. Tubbataha Reef National Marine Park, Palawan, Philippines, April 2009. Model released.

Juergen Freund / Giant barrel sponge (Xestospongia testudinaria) studded with crinoids / featherstars with diver in the background, Kimbe Bay, West New Britain, Papua New Guinea.

Michele Westmorland / Diver at healthy reef system with large Barrel sponge (Xestospongia testudinaria) covered with crinoids / feather stars (Oxycomanthus bennetti). Mulloway's Reef, Tufi, Papua New Guinea, model released...

Fred Bavendam / Giant Barrel Sponge (Xestospongia testudinaria) spawning, Bali, Indonesia

Carine Schrurs / Coral reef scenic with Barrel sponges {Xestospongia testudinaria}, Crinoids {Crinoidea}, Anthias fish Batangas, Philippines. Indo-Pacific

Georgette Douwma / Barrel Sponge (Xestospongia testudinaria) on coral reef with soft corals (Scleronephthya sp), gorgonian and Lyretail anthias (Pseudanthias squamipinnis). Komodo National Park, Indonesia.

Georgette Douwma / Barrel Sponge (Xestospongia testudinaria) on coral reef with soft corals (Scleronephthya sp), gorgonian and Lyretail anthias (Pseudanthias squamipinnis). Komodo National Park, Indonesia.

Juergen Freund / Giant barrel sponge (Xestospongia testudinaria) studded with crinoids / featherstars, West New Britain, Papua New Guinea.

Juergen Freund / Barrel sponges (Xestospongia testudinaria) on coral reef with diver, Moluccas Islands, Indonesia.

Juergen Freund / Barrel sponge (Xestospongia testudinaria) on reef, Kimbe Bay, West New Britain, Papua New Guinea.

Juergen Freund / Massive barrel sponge (Xestospongia testudinaria)on seabed. Misool, Raja Ampat, West Papua, Indonesia

Georgette Douwma / Scuba diver on coral reef with Barrel Sponge (Xestospongia testudinaria) and soft corals. Komodo National Park, Indonesia. Model Released

Georgette Douwma / Reef with Pygmy Sweepers (Parapriacanthus ransonetti), Barrel Sponge (Xestospongia testudinaria), and soft corals. Komodo National Park, Indonesia, October.

Georgette Douwma / Reef with Pygmy Sweepers (Parapriacanthus ransonetti), Barrel Sponge (Xestospongia testudinaria), and soft corals. Komodo National Park, Indonesia, October.

Pete Oxford / Giant Barrel Sponge (Xestospongia testudinaria) growing on reef, Belize Barrier Reef, Belize

GEORGETTE DOUWMA / Barrel sponges (Xestospongia testudinaria) growing on shipwreck of 'The Liberty', Bali, Indonesia.

GEORGETTE DOUWMA / Barrel sponge (Xestospongia testudinaria). Misool, Raja Ampat, West Papua, Indonesia.

Fred Bavendam / Giant Barrel Sponge (Xestospongia testudinaria) and coral, Manado, Sulawesi, Indonesia

Chris Newbert / Soft Coral (Dendronephthya sp) and Giant Barrel Sponge (Xestospongia testudinaria), Indonesia

Michele Westmorland / Diver at healthy reef system with large Barrel sponge (Xestospongia testudinaria) covered with crinoids / feather stars (Oxycomanthus bennetti). Mulloway's Reef, Tufi, Papua New Guinea, model released...

Michele Westmorland / Large Testude barrel sponges (Xestospongia testudinaria) with crinoids / feather stars (Oxycomanthus bennetti) Marion's Reef, Tufi, Papua New Guinea

GEORGETTE DOUWMA / Lambert's worm sea cucumber (Synaptula lamperti) on a Giant barrel sponge (Xestospongia testudinaria) Komodo, Indonesia

Juergen Freund / Barrel sponge {Xestospongia testudinaria} in Caribbean Sea

Juergen Freund / Diver looking into Barrel sponge {Xestospongia testudinaria} Philippines, Pacific

Juergen Freund / Barrel sponge {Xestospongia testudinaria} with Sea anemones within barrel, Indo pacific

Fred Bavendam / Giant Barrel Sponge (Xestospongia testudinaria) broadcast releasing it's eggs into the ocean current for dispersal, Bali, Indonesia

Juergen Freund / Diver at spawning Barrel sponge {Xestospongia testudinaria} Indo-pacific

Juergen Freund / Spawning barrel sponge {Xestospongia testudinaria} Papua New Guinea

Juergen Freund / Spawning barrel sponge {Xestospongia testudinaria}Indo-pacific

Chris Newbert / Giant Barrel Sponge (Xestospongia testudinaria) and Soft Coral (Dendronephthya sp) 90 feet deep, Solomon Islands

Chris Newbert / Giant Barrel Sponge (Xestospongia testudinaria) and Soft Coral (Dendronephthya sp) with baitfish and Damselfish (Chromis margaritifer) 90 feet deep Solomon Islands

Chris Newbert / Giant Barrel Sponge (Xestospongia testudinaria) and schooling Fusiliers (Caesio sp) 70 feet deep, Papua New Guinea

Constantinos Petrinos / Barrel sponge {Xestospongia testudinaria} + Crinoids on coral reef. Philippines Anilao

Constantinos Petrinos / Frimbriated moray eel {Gymnothorax fimbriatus} hiding inside Barrel sponge {Xestospongia testudinaria} Lembeh Strait, Sulawesi Indonesia

Constantinos Petrinos / Barrel sponge {Xestospongia testudinaria} + Crinoids on coral reef. Philippines. Anilao, Batangas

Juergen Freund / Barrel sponges {Testospongia testudinaria} Indo-pacific