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  • Clark's anemonefish (Amphiprion clarkii) in the host-sea anemone Heteractis magnifica. Photo from the Maldives.
    2778.jpg
  • The Great Barrier Reef! Hardy Reef (left) and hook Reef (right) are parts of Great Barrier Reefs' mddle secrion and is found off Whitsunday islands and the town Macay in central Queensland.
    18353.jpg
  • Moon Jellies, Aurelia aurita.
    5685-D.jpg
  • Hook and Hardy Reef in the central Great Barrier Reef complex.  The reefs are seperated by a deep channel.  Diveboats typically anchor here.
    18070-D.jpg
  • Moon Jellies, Aurelia aurita.
    5684-D.jpg
  • The magnificent anemones Utricina eques.
    5678-D.jpg
  • Pocillopora damicronis
    80195.jpg
  • Reef flat with dense growth of coral on the island of nananu-I-Ra (Mokusigas), Viti Levu, Fiji.
    18324.jpg
  • Hardy Reef is part of Great Barrier Reefs' mddle secrion and is found off Whitsunday islands and the town Macay in central Queensland.
    18347.jpg
  • Guard crabs (Trapezia sp. and Tetralia sp.) in a thin birdnest coral (Seriatopora hystrix), Bunaken, North Sulawesi, Indonesia.
    8118.jpg
  • Christmas Tree Worm (Spirobranchus corniculatus) from Flinders Reef, the Coral Sea.
    6120.jpg
  • The prominent medusa stage of the hydrozoan Leuckartara octona from Hidra, south-western Norway in October 2009.
    5673-D.jpg
  • The magnificent anemones Utricina eques.
    5679-D.jpg
  • Sea Goosberry, Beroe cucumis, from southern Norway. Do notice the beautiful light-reflecting cilia on the combs.
    5511-D.jpg
  • Mushroom-anemones from the genus Discosoma.
    5549-D.jpg
  • The magnificent anemones Utricina eques.
    5676-D.jpg
  • Bubble-tip Anemone, Entacmaea quadricolor. Close up of the tentacles.
    5641-D.jpg
  • Plumose Anemone, Metridium senile.
    5533-D.jpg
  • Mediterranean Snakelocks Anemone, Anemonia sulcata.
    5529-D.jpg
  • Close up of a section of Hook and Hardy Reef, middle section of the Great Barrier Reef off Whitsunday Islands.  Brown is live corals, blue is sandy lagoon bottom while light green is shallow sand.
    18102-D.jpg
  • Reef flat with dense growth of coral on the island of nananu-I-Ra (Mokusigas), Viti Levu, Fiji.
    18584.jpg
  • A pair of Maldive anemonefish (Amphiprion nigripes) in the Magnificent host-sea Anemone (Heteractis magnifica)
    35035.jpg
  • Gall containing the female common coral gall crab (Hapalocarcinus marsupialis) on Seriatopora hystrix, collected from an Indonbesian Reef.
    8140.jpg
  • Gall containing the female common coral gall crab (Hapalocarcinus marsupialis) on Seriatopora hystrix, collected from an Indonbesian Reef.
    8119.jpg
  • Tropical Sea Pen, Cavernularia sp.
    80151.jpg
  • Tropical Sea Pen, Cavernularia sp.
    80011.jpg
  • Colony of Hairy Mushroom Anemone or Indonesian Elephant Ear, Rhodactis cf. indosinensis.
    5548-D.jpg
  • Porites sp. forming a microatoll at Green Island, GBR, Australia.
    80112.jpg
  • Tubastraea sp., close up of the expanded polyps.
    5085.jpg
  • Sea Goosberries, Beroe cucumis, from southern Norway. Do notice the beautiful light-reflecting cilia on the combs.
    5510-D.jpg
  • Ricordea florida from Western Atlantic shining i fluorescent light.
    5668-D.jpg
  • Ricordea florida from Western Atlantic shining i fluorescent light.
    5601-D.jpg
  • Striped Anemone, Anthothoe stimpsoni.
    5530-D.jpg
  • Blastomussa wellsi
    80101.jpg
  • Alveopora sp.
    5637-D.jpg
  • Part of Hardy Reef in the central GBR-section off Whitsunday Island as seen from the air. In the centre is the small patch-reef known as "Heart Reef" - obvious why.
    18059-D.jpg
  • Reef structures, live corals (brown), shallow sand flats (light green) and deeper sand flatss (blue) in Hardy Reef, central Great Barrier Reef section.
    18060-D.jpg
  • Dive boats and big catamarans bring tourists to Hardy Reef off Whitsunday island for skin- and SCUBA-diving on the feef flat.  The boats are anchored in the channel between Hardy- and Hook Reef.
    18068-D.jpg
  • Diving a beautiful cave on "Nakohlu Giri" a reef site close to the island of Kuredu, the Maldives
    18492.jpg
  • Reef flat with dense growth of coral on the island of nananu-I-Ra (Mokusigas), Viti Levu, Fiji.
    18552.jpg
  • Sabbleback Clownfishesd (Amphiprion polymnus) and Three-spotted Dascyllus (Dascyllus trimaculatus) in association with the host-sea anemone (Stichodactyla haddoni) in a sea-grass bed at Cabilao, the Philippines.
    35591.jpg
  • Prideauxæ's hermit crab (Pagurus prideaux) with cloak anemone (Adamsia palliata).
    8148.jpg
  • Pelagic medusae from an unidentified hydrozoa. Collected from coastal surface water of south-western Norway.
    17178-D.jpg
  • Pelagic medusa from an unidentified hydrozoa. Collected from coastal surface water of south-western Norway.
    17177-D.jpg
  • Tropical sea pen (Cavernularia sp.).
    80231.jpg
  • Hardy- and Hook Reef off the Whitsundaays Islands in the central Great Barrier Reef complex, Australia.
    18104-D.jpg
  • The siphonophor known as Hula-skirt Jellyfish, (Physophora hydrostatica), collected from surface water of Hidra, south-western Norway in late January 2012.
    5692-D.jpg
  • Kuredu Island, Maldives. Nikon AF-601, 60mm micronikkor, Subal UW-housing, Iklite 225TTL UW-flash, Fuji Velvia 50ASA, april 1992
    Clown fish in purple anemone (5401).jpg
  • Acropora spp. growing densly on the shallow reef flat of Heron Island, Great Barrier Reef, Australia.
    5040.jpg
  • Dense and impressive growth of Porites cylindrica (branching, yellow in the foreground) with Acropora sp. and Merulina sp. in the background. Photo from Bunaken, Indonesia.
    5398.jpg
  • Sea Goosberry, Pleurobranchia pileus, a very common Comb Jelly in the Northern Atlantic. Detail structures are clearly visible in this photo. Note how the cilia reflects the light in different colors.
    5100-D.jpg
  • Sea Goosberry, Pleurobranchia pileus, a very common Comb Jelly in the Northern Atlantic. Detail structures are clearly visible in this photo. Note how the cilia reflects the light in different colors.
    5101-D.jpg
  • Blue-button, Porpita porpita, from the Philippines.
    5333.jpg
  • Sea Goosberry, Beroe cucumis, from southern Norway. Do notice the beautiful light-reflecting cilia on the combs.
    5512-D.jpg
  • Blue-button, Porpita porpita, from the Philippines.
    80235.jpg
  • Spotted Jelly, Mastigas papua.
    5683-D.jpg
  • Ricordea florida from Western Atlantic shining i fluorescent light.
    5667-D.jpg
  • Rhodactis sp. shining blue and red in fluorescent light.
    5663-D.jpg
  • Blue-button, Porpita porpita, from the Philippines.
    5371.jpg
  • Ricordea florida from Western Atlantic shining i fluorescent light.
    5598-D.jpg
  • Ricordea florida from Western Atlantic shining i fluorescent light.
    5596-D.jpg
  • Ricordea florida from Western Atlantic.
    5561-D.jpg
  • The magnificent anemones Utricina eques.
    5680-D.jpg
  • Ricordea florida from Western Atlantic shining i fluorescent light.
    5595-D.jpg
  • Red mouth Elephant Ear, Rhodactis cf. rhodostoma.
    5550-D.jpg
  • The magnificent anemones Utricina eques.
    5677-D.jpg
  • Plumose Anemone, Metridium senile.
    5535-D.jpg
  • Plumose Anemone, Metridium senile.
    5534-D.jpg
  • Plumose Anemone, Metridium senile.
    5536-D.jpg
  • Caribbean Giant Anemone (Condylactis gigantea), Close up of the tentacles.
    5661-D.jpg
  • Close up of a section of Hook and Hardy Reef, middle section of the Great Barrier Reef off Whitsunday Islands.  Brown is live corals, blue is sandy lagoon bottom while light green is shallow sand.
    18066-D.jpg
  • Hardy- and Hook Reef off the Whitsundaays Islands in the central Great Barrier Reef complex, Australia.
    18099-D.jpg
  • Hardy- and Hook Reef off the Whitsundaays Islands in the central Great Barrier Reef complex, Australia.
    18103-D.jpg
  • Sohal of Damselfishes (Blue Chromis, Chromis sp.) gathering around a branching coral (Acropora sp.).
    18377A.jpg
  • A beautiful cave on "Nakohlu Giri" a reef site close to the island of Kuredu, the Maldives
    18489A.jpg
  • Reef flat with dense growth of coral on the island of nananu-I-Ra (Mokusigas), Viti Levu, Fiji.
    18551.jpg
  • Fringing reefs on the "Coral Coast" on the southern side of Viti Levu, Fiji.
    18520.jpg
  • Hardy- and Hook Reef off the Whitsundaays Islands in the central Great Barrier Reef complex, Australia.
    18577.jpg
  • Stinging cells (nematocysts) in the tentacles of the Lion's Mane jellyfish (Cyanea capillata)
    17066-D.jpg
  • Burrows of the petroglyph shrimp Alpheus deuteropus in stony corals (Acropora sp.) from Krabi, Thailand. Do note the small, munidentified hydrozoans that line the burrows.
    8136.jpg
  • Common coral gall crab (Hapalocarcinus marsupialis, female) from Rarotonga, the Cook Islands, south Pacific.
    8116.jpg
  • Red hermit crab (Dardanus calidus) assiciated with the anemone Calliactis parasitica.
    8068.jpg
  • Christmas Tree Worms(Spirobranchus gardineri) in the coral Leptoseris mycetoseroides. Photo from 20 meters depth at Kuredu Island, the Maldives.
    6134.jpg
  • Tropical sea pen (Cavernularia sp.).
    5006.jpg
  • The prominent medusa stage of the hydrozoan Leuckartara octona from Hidra, south-western Norway in October 2009.
    5675-D.jpg
  • The siphonophor known as Hula-skirt Jellyfish, (Physophora hydrostatica), collected from surface water of Hidra, south-western Norway in late January 2012.
    5691-D.jpg
  • Mushroom-anemones from the genus Discosoma.
    5547-D.jpg
  • Trachyphyllia geffroyi
    5648-D.jpg
  • The corallites of Diplorastrea heliopora.
    80147.jpg
  • Stony corals, mostly Acropora spp., growing at a shallow reef flat in Fiji.
    80210.jpg
  • A colourful diversity of stony corals at the Great Barrier Reef. Pectinia paeonia (two colonies left), Lobophyllia sp. (center) and branching Porites cylindrica together with a pink Montipora sp.
    5586.jpg
  • Tubastraea sp., from a reef wall in the Maldives.
    5648.jpg
  • Tubastraea sp. with fully expanded polyps.
    5540-D.jpg
  • Sea Goosberry, Beroe cucumis, from southern Norway. Do notice the beautiful light-reflecting cilia on the combs.
    5514-D.jpg
  • Sea Goosberry, Beroe cucumis, from southern Norway. Do notice the beautiful light-reflecting cilia on the combs.
    5516-D.jpg
  • Blue-button, Porpita porpita, as they appeared along the beach of an island in the Phillipines after a storm.
    5330.jpg
  • Blue-button, Porpita porpita, from the Philippines.
    5329.jpg
  • Striped Anemone, Anthothoe stimpsoni
    5532-D.jpg
  • Close up of a section of Hook and Hardy Reef, middle section of the Great Barrier Reef off Whitsunday Islands.  Brown is live corals, blue is sandy lagoon bottom while light green is shallow sand.
    18061-D.jpg
  • Reef flat with dense growth of coral on the island of nananu-I-Ra (Mokusigas), Viti Levu, Fiji.
    18317.jpg
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Alf J. Nilsen Natural History images

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