Fan Worm on red Sponge, Spirographis sp., Caribbean Sea, Dominica

Coral Crab inside sponge, Trapezia sp., Ambon, Moluccas, Indonesia

Fan Worm on red Sponge, Spirographis sp., Caribbean Sea, Dominica

Crinoid on Red Sponge, Comanthina sp., Raja Ampat, West Papua, Indonesia

Coral Crab inside sponge, Trapezia sp., Ambon, Moluccas, Indonesia

A bright cup coral, Tubastrea sp., grows on a remote reef in Raja Ampat, Indonesia.

A vibrant nudibranch, Phyllidia sp., feeds on sponges on a coral reef in the remote, tropical islands of Raja Ampat, Indonesia.

Grouper (Cephalopholis sp.) inside barrel sponge (Xestospongia testudinaria), Amed, Bali, Indonesia, Southeast Asia, Asia

Sea cucumbers (Synaptula sp.) on giant barrel sponge (Xestospongia testudinaria), Dumaguete, Negros Island, Philippines, Southeast Asia, Asia

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

Orange Petrosid Sponge, (Petrosia sp.). Gorontalo, Sulawesi, Indonesia

Sea Fan (Muricella sp.), rope Sponges and diver. Gorontalo, Sulawesi, Indonesia

Red encrusting sponge (Clathria sp.), Pohnpei, Federated States of Micronesia, Caroline Islands, Micronesia, Pacific Ocean, Pacific

Sea cucumbers (Synaptula sp.) on giant barrel sponge (Xestospongia testudinaria), Dumaguete, Negros Island, Philippines, Southeast Asia, Asia

Rope Sponges (Callyspongia sp.) and diver. Gorontalo, Sulawesi, Indonesia

Red soft coral (Dendronephthya sp.) and sponges encrusted on the Fujikawa Maru, Truk lagoon, Chuuk, Federated States of Micronesia, Caroline Islands, Micronesia, Pacific Ocean, Pacific

Rope Sponges (Callyspongia sp.) and diver. Gorontalo, Sulawesi, Indonesia

Sponge Axinella sp

Encrusting sponge, Clathria sp, detail. This genus takes the shape of whatever it begins growing on. Buyat Bay, North Sulawesi, Indonesia, Pacific Ocean.

Anchor damaged Sponges (Petrosia sp.). Gorontalo, Sulawesi, Indonesia

Nudibranch, Jorunna funebris, feeding on blue sponge, Haliclona sp., Monkey beach, Puerto Galera, Mindoro, Philippines.

This red encrusting sponge (Clathria sp.) is the most common of this family found in Hawaii. Here it has covered the calcium carbonate-producing seaweed, Halimeda kanaloana, Hawaii, United States of America

Skeleton shrimp (Caprellide sp.) clinging to a sponge, Dumaguete, Philippines

Giant barrel sponge and Unicornfish, Raja Ampat Indonesia