Highly diverse coral head, including tube sponge (Theonella cylindrica), Apo Island marine reserve, Philippines, Visayan sea, Southeast Asia, Asia

invertebrates diversity coral head coral coral reef tube sponge theonella cylindrica apo island marine reserve philippines visayan sea fish fishes blue waters tropical corals coral reefs reef reefs tube sponges sponges apo island nature natural world marine life southeast asia asia day outdoors horizontal