Georgette Douwma / Dalmatian linckia starfish (Linckia multifora). North Sulawesi, Indonesia.

David Fleetham / Blue sea star (Linckia laevigata) perching as high as it can while spawning into current. Puerto Galera, Philippines.

David Fleetham / Sea snail (Thyca crystallina), two growing on host Blue sea star (Linckia laevigata). Philippines.

Alex Mustard / Seafans and soft corals grow on the wooden legs of Arborek jetty, with Blue starfish (Linckia laevigata). Arborek Island, Raja Ampat, West Papua, Indonesia. Dampier Strait. Ceram Sea. Tropical West Pa...

Claudio Contreras / Crown of Thorns seastar (Acanthaster planci) detail, Espiritu Santo National Park, Sea of Cortez (Gulf of California), Mexico, February

Claudio Contreras / Crown of thorns seastar (Acanthaster planci) eating coral, Espiritu Santo National Park, Sea of Cortez (Gulf of California), Mexico, February

Claudio Contreras / Crown of Thorns Seastar (Acanthaster planci) eating coral, Espiritu Santo National Park, Sea of Cortez (Gulf of California), Mexico, February

Magnus Lundgren / Wild Wonders of China / Blue bat star (Patiria pectinifera) close-up from above with sieve plate. Zhifu Island, Bohai Sea, Yellow Sea, Shandong Province, China.

Magnus Lundgren / Wild Wonders of China / Blue bat star (Patiria pectinifera) on rock. Zhifu Island, Bohai Sea, Yellow Sea, Shandong Province, China.

Magnus Lundgren / Wild Wonders of China / Blue bat star (Patiria pectinifera). Zhifu Island, Shandong Province, China.

Magnus Lundgren / Wild Wonders of China / Chameleon goby (Tridentiger trigonocephalus) with Blue bat star (Patiria pectinifera) in background. Bohai Sea, Yellow Sea. Zhifu Island, Shandong Province, China.

Magnus Lundgren / Wild Wonders of China / Blue bat star (Patiria pectinifera) with eye spot on arm, Bohai Sea, Yellow Sea. Zhifu Island, Shandong Province, China.