Juergen Freund / Tube coral (Tubastrea sp) Komodo NP, Indonesia.

Juergen Freund / Detail of a Sea Pen showing polyps with eight arms (octocoral) and Brittlestars that have curled themselves around the stem of the sea pen, Palawan, Philippines.

Juergen Freund / Details of Mushroom coral (Fungia sp) with polyps out, Komodo NP, Indonesia.

Juergen Freund / Two whip corals intertwined, Komodo NP, Indonesia.

Juergen Freund / Details of the venomous pedicillariae toxic Flower sea urchin (Toxopneustes pileolus) Komodo NP, Indonesia.

Juergen Freund / Coral (Lobophyllia sp) Komodo NP, Indonesia.

Juergen Freund / Whip coral on coral reef, Komodo NP, Indonesia.

Juergen Freund / Mushroom leather coral (Sarcophyton sp) on coral reef, West Papua, Indonesia.

Juergen Freund / Fan coral with polyps fully extended, West Papua, Indonesia.

Juergen Freund / Detail of a fan coral with polyps fully extended, West Papua, Indonesia.

Juergen Freund / Field of Mushroom corals (Fungia sp.). Lembeh Strait, North Sulawesi, Indonesia.

Juergen Freund / Corallimorpharian / Disc anemone (Amplexidiscus fenestrafer), an intermediate between sea anemone and hard coral, on coral reef, Bali, Indo-pacific.

Juergen Freund / Black coral in the reef with clams, Moluccas Islands, Indo-pacific.

Juergen Freund / Tube-dwelling anemone / cerianthid. These look similar to sea anemones but belong to a different subclass of anthozoans. Lembeh Strait, North Sulawesi, Indonesia.

Juergen Freund / Mushroom coral (Fungia sp.) on the rubble. Lembeh Strait, North Sulawesi, Indonesia.

Juergen Freund / Tube-dwelling anemone / cerianthid. These look similar to sea anemones but belong to a different subclass of anthozoans. Lembeh Strait, North Sulawesi, Indonesia.

Juergen Freund / Mushroom coral (Fungia scutaria) in the reef rubble. Lembeh Strait, North Sulawesi, Indonesia.

Juergen Freund / Flower Urchin (Toxopneustes pileolus) on seabed, Lembeh Strait, North Sulawesi, Indonesia.

Tim Laman / Sea pen (order Pennatulacea) growing on a sandy seabed, Bali, Indonesia.

Tim Laman / Sea Pen (order Pennatulacea) growing on a sandy seabed, Bali, Indonesia.

Tim Laman / View of Tube anemone (Cerianthidae) from above, Malapascua Island, Visayan Sea, Philippines

Juergen Freund / Pygmy seahorse (Hippocampus bargibanti) on fan coral, Pacific

Juergen Freund / Soft Coral {Alcyonacea} on rock, Philippines

Juergen Freund / Fan coral {Subergorgia mollis} with Feather star attached, Philippines

Juergen Freund / Gorgonia Sea fan {Subergorgia mollis} Indo Pacific

Juergen Freund / Bags of Sea anemones for sale for food, Tawi, Philippines

Juergen Freund / Upside-down jellyfish {Cassiopeia sp} Kakaban Lake, Kalimantan, Indonesia

Juergen Freund / Coral {Euphyllia ancora} Pacific, Philippines

Juergen Freund / Coral reef at low tide. Philippines, Indo Pacific

Roberto Rinaldi / Colony of Zoantharians, a type of sea anemone, Philippines.

Roberto Rinaldi / Polyps of Tubastrea sp, Tubbataha reef, Philippines.

Roberto Rinaldi / Close up of a polyp of hard coral (Tubastrea sp), Tubbataha Reef, Philippines.

Roberto Rinaldi / Close up of a polyp of a tube coral (Tubastrea sp), Tubbataha Reef, Philippines.

Roberto Rinaldi / Red whip coral (Junceella sp), Malaysia.

Roberto Rinaldi / Polyps of grogonian seafan.

Roberto Rinaldi / Hawksbill turtle (Eretmochelys imbricata) swimming among corals with a large school of jacks (Carangidae), Sipadan, Malaysia