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

Nick Upton / Tortoise bug (Eurygaster testudinaria) well camouflaged on a Salad Burnet (Sanguisorba minor) seedhead, chalk grassland meadow, Wiltshire, UK, June.

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.