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  • These feathery structures are modified<br />
prostomial palps (mouth appendages) of Spirobranchus giganteus  polychaete worms. These spiral radioles are lined with cilia and are used by the worm for feeding and breathing. These worms have a mutual symbiotic relationship with their host corals.<br />
The corals provide structural support and protection, while the worms enhance water circulation which helps corals feed.
    spirobranchus-giganteus-christmas-tr...tif
  • These feathery structures are modified<br />
prostomial palps (mouth appendages) of Spirobranchus giganteus  polychaete worms. These spiral radioles are lined with cilia and are used by the worm for feeding and breathing. The circular structure in the foreground is the operculum, which the worm uses to seal its burrow.
    spirobranchus-giganteus-christmas-tr...tif
  • Anemone hermit crab (Dardanus pedunculatus) capturing and eating a mollusk. This hermit crab has a symbiotic relationship with anemones. The crab attaches anemones to the shell it lives in and transfers the anemones when it grows larger and changes shells. The anemones provide defence against predators like octopuses. It is possible that transfer of shells took place after this photograph was taken.
    anemone-hermit-crab-dardanus-peduncu...tif
  • Black and white squat lobster (Allogalathea elegans) sitting on a crinoid. Ambon, Indonesia
    Allogalathea-elegans-squat-lobster-o...tif
  • Whip coral shrimp (Pontonides ankeri) on a sea whip (Cirripathes sp.) in Lembeh Strait, Indonesia. This species is often confused with Pontonides unciger, which lives on bushy black corals (Anthipathes sp.)
    pontonides-ankeri-shrimp-on-cirripat...tif
  • This jellyfish lives in the world-famous Jellyfish Lake in Palau’s Rock Islands. Descended from Mastigias papua jellyfish that live in the open ocean, this individual and others in the lake have lost most of their stinging capability. Within the confines of a small landlocked lake, there is minimal prey. Instead of hunting for food, these jellyfish host colonies of symbiotic algae, which produce food through photosynthesis. The jellyfish obtains sustenance from the algae. There are actually a number of lakes hosting such populations of stingless jellyfish in Palau, but only one is open to the general public.
    jellyfish-lake-palau-mastigias-papua...tif
  • Giant moray eel (Gymnothorax javanicus) being cleaned by scarlet cleaner shrimp (Lysmata amboinensis). Ambon, Indonesia
    giant-moray-eel-Gymnothorax-javanicu...tif
  • Pretty pink anemonefish with mouth open
    pink-anemonefish-amphiprion-peridera...tif
  • This is a pair of leopard anemone shrimp (Izucaris masudai) on their host Nemanthus sp. anemone. The larger of the two is the female. First described in Japan in 1999, this species is called ayatori-kakure-ebi in Japanese..
    izucaris-masudai-leopard-anemone-shr...tif
  • These feathery structures are modified<br />
prostomial palps (mouth appendages) of Spirobranchus giganteus  polychaete worms, often called Christmas tree worms. These spiral radioles are lined with cilia and are used by the worm for feeding and breathing. These worms have a mutual symbiotic relationship with their host corals. The corals provide structural support and protection, while the worms enhance water circulation which helps corals feed.
    spirobranchus-giganteus-christmas-tr...tif
  • Diver Terry Ward shining a light on multicolored Lobophyllia brain coral formation at Darwin's Wall that Ron Leidich has dubbed the Four Corners. This unique location is flushed by strong currents exchanged between a large inner lake (Long Lake) and the open ocean, generating ample nutrient flow to support these slow-growing corals, which flourish in large numbers and grow to exceptional size in this area. There is minimal sunlight that penetrates the canopy of overhanging foliage, meaning than the corals rely more on the daily tidal exchange for nutrients than on their zooxanthallae. This wall and the corals that live on them are a perfect illustration of the intricate relationship between the ecosystems of the inner lakes of Palau's Rock Islands and the open ocean.
    diver-with-lobophyllia-coral-darwins...tif
  • Two jellyfish bumping heads, Jellyfish Lake, Palau. Mastigias cf. papua etpisoni
    jellyfish-lake-palau-mastigias-cf-pa...tif
  • Pontonides sp. commensal shrimp on a curled-up whip coral (Cirrhipathes sp.) formation
    Pontonides-commensal-shrimp-on-Cirrh...tif
  • Pair of Coleman shrimp (Periclimenes colemani) on fire urchin (Asthenosoma varium). Ambon, Indonesia
    Periclimenes-colemani-Coleman-shrimp...tif
  • A tiny cleaning shrimp (Urocaridella sp.) dwarfed by the size of its client, a giant moray eel (Gymnothorax javanicus). Ambon, Indonesia.
    Urocaridella-cleaner-shrimp-giant-mo...tif
  • Zebra crab (Zebrida adamsii) on venomous fire urchin (Asthenosoma varium) in Ambon, Indonesia
    zebra-crab-Zebrida-adamsii-venomous-...tif
  • Giant moray eel (Gymnothorax javanicus) being cleaned by scarlet cleaner shrimp (Lysmata amboinensis). Ambon, Indonesia
    giant-moray-eel-Gymnothorax-javanicu...tif
  • Wire coral goby (Bryaninops yongei) photographed with a bit of motion-blur to show this fish opening its mouth
    whip-coral-goby-Bryaninops-yongei-mo...tif
  • Unusually patterned clown anemonefish (Amphiprion percula), missing the orange patch on its anterior dorsal area just behind the white stripe. This photograph is a film scan.
    unusual-clown-anemonefish-amphiprion...tif
  • Swarm of golden jellyfish (Mastigias cf. papua etpisoni) in Palau's Jellyfish Lake. These jellyfish have been isolated in a saltwater lake for thousands of years. They have lost most of their ability to sting, and depend upon symbiotic algae for food. Jellyfish Lake is one of five saltwater lakes in Palau with jellyfish populations similar to these.
    jellyfish-lake-palau-mastigias-cf-pa...tif
  • Jellyfish Lake in Palau is one of five saltwater lakes in the Rock Islands of Palau that are inhabited by jellyfish that have lost most of their stinging capability. It is the only one of the five lakes that is open for tourists to visit. The jellyfish depend on algae that live within their bodies for nutrition. The symbiotic algae use photosynthesis to produce nutrients. Jellyfish Lake is connected to the ocean through fissures and tunnels in the limestone.
    jellyfish-lake-palau-mastigias-cf-pa...tif
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Tony Wu Underwater Photography

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