Coral Reef with Barrel Sponge, Xestospongia testudinaria, Kai Islands, Moluccas, Indonesia

Barrel sponges and creole wrasse, St. Lucia, West Indies, Caribbean, Central America

Coral reef with Barrel Sponge, Xestospongia testudinaria, Raja Ampat, West Papua, Indonesia

Scorpianfish (Scorpaenopsis oxycephalus), inside barrel sponge (Xestospongia testudinaria), Amed, Bali, Indonesia, Southeast Asia, Asia

Barrel sponge (Xestospongia muta), large barrel sponge in spur and groove reef, Little Cayman Island, Cayman Islands, Caribbean

Diver looks down on blue seastar (Linkia laevigata) on a barrel sponge (Xestospongia sp.) Komodo, Indonesia, Pacific Ocean.

Barrel sponge (Xestospongia muta), large barrel sponge in spur and groove reef, Little Cayman Island, Cayman Islands, Caribbean

Barrel sponge (Xestospongia muta), large barrel sponge in spur and groove reef, Little Cayman Island, Cayman Islands, Caribbean

Thousands of scalefin anthias, Pseudanthias squamipinnis, hover over corals and barrel sponge, Puerto Galera, Mindoro, Philippines.

Female diver with a lamp looking at a Barrel Sponge (Xestospongia muta) in a multi-coloured coral reef with various sponges and corals, Hopkins, Dangria, Belize, Central America, Caribbean

Diver looking at Giant Barrel Sponge (Xestospongia muta) in coral reef, Caribbean, Dominican Republic, Central America

A female diver explores a barrel sponge, St. Lucia.

Squirrelfish (Holocentrus adscensionsis) finds shelter near a large Barrel sponge.