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  • Hypselodoris zephyra nudibranch in Lembeh Strait, North Sulawesi, Indonesia
    Hypselodoris-zephyra-nudibranch-lemb...tif
  • Nembrotha cristata nudibranch foraging on the reef in Ambon, Indonesia
    Nembrotha-cristata-nudibranch-ambon-...tif
  • Super macro photograph of a Chromodoris willani nudibranch in the Lembeh Strait, North Sulawesi, Indonesia
    Chromodoris-willani-nudibranch-super...tif
  • Glossodoris rufomarginata nudibranch in Ambon, Indonesia
    Glossodoris-rufomarginata-nudibranch...tif
  • This is a head-on, close-up view of a colorful Nembrotha purpureolineata nudibranch
    nembrotha-purpureolineata-nudibranch...tif
  • Aegires gardineri nudibranch photographed at Sawa Sawa Sawaga in Milne Bay, Papua New Guinea
    Aegires-gardineri-nudibranch-milne-b...tif
  • An extreme close-up, shot at 5x life-size magnification, of the feather-like gills of a Chromodoris coi nudibranch
    chromodoris-coi-nudibranch-milne-bay...tif
  • Close-up view of strands of multicolored sea hare eggs (Aplysia sp.)
    sea-hare-eggs-high-magnification-jap...tif
  • Beautiful orange, yellow and purple Ceratosoma tenue nudibranch crawling along the muck bottom of Lembeh Strait, North Sulawesi, Indonesia
    Ceratosoma-tenue-nudibranch-lembeh-s...tif
  • This is a blue ocean slug (Glaucus atlanticus) approaching the venom-filled tentacles of a blue bottle (Physalia physalis). Both were washed ashore as part of a mass, multi-day stranding of thousands of blue bottles, which are colonial siphonophores that are also called Portuguese man-of-wars. The nudibranchs are part of the rarely seen blue community of the open ocean. They prey on other animals in that community, such as Physalia physalis, by-the-wind-sailors (Velella velella), blue buttons (Porpita porpita), and violet snails (Janthina janthina). Glaucus nudibranchs are immune to the venom of the blue bottles that they consume. They store their prey’s nematocysts and deploy them in specialized cnidosacs at the tips of their ornate cerata. Because these nudibranchs concentrate the venom of their prey, they can produce a more powerful sting than Physalia.
    glaucus-atlanticus-nudibranch-with-p...tif
  • A Melibe pilosa nudibranch expanding and extending its semi-transparent oral hood to scoop up rubble and sift through it for food. Lembeh Strait, North Sulawesi, Indonesia.
    Melibe-pilosa-nudibranch-lembeh-stra...tif
  • Risbecia tryoni nudibranch in Ambon, Indonesia
    Risbecia-tryoni-nudibranch-ambon-ind...tif
  • Nembrotha lineolata nudibranch foraging on small, green Didemnum molle tunicates. Ambon, Indonesia
    Nembrotha-lineolata-nudibranch-eatin...tif
  • Chromodoris lochi nudibranch in Ambon, Indonesia
    Chromodoris-lochi-nudibranch-ambon-i...tif
  • Yellow and black Thecacera nudibranch in Ambon, Indonesia
    Thecacera-nudibranch-ambon-indonesia...tif
  • Orange and purple Thecacera sp. nudibranch
    Thecacera-nudibranch-orange-purple-a...tif
  • Pair of Risbecia tryoni nudibranchs mating. Lembeh Strait, North Sulawesi, Indonesia
    Risbecia-tryoni-nudibranchs-mating-l...tif
  • Jorunna funebris nudibranch with a somewhat unusual abundance of dark splotches. Photographed at Sawa Sawa Sawaga in Milne Bay, Papua New Guinea
    unusual-Jorunna-funebris-nudibranch-...tif
  • Cute orange and white Thecacera picta nudibranch curled up around a bryozoan growing on an orange sponge
    thecacera-picta-nudibranch-ambon-200...tif
  • Unique backlighting for Hypselodoris kanga nudibranch in the Lembeh Strait, North Sulawesi, Indonesia
    Hypselodoris-kanga-nudibranch-with-b...tif
  • A Melibe pilosa nudibranch expanding and extending its semi-transparent oral hood to scoop up rubble and sift through it for food. Lembeh Strait, North Sulawesi, Indonesia.
    Melibe-pilosa-nudibranch-lembeh-stra...tif
  • Ceratosoma sinuatum nudibranch with one rhinophore flopped over. Ambon, Indonesia
    Ceratosoma-sinuatum-nudibranch-ambon...tif
  • Chromodoris lochi nudibranch in Ambon, Indonesia
    Chromodoris-lochi-nudibranch-ambon-i...tif
  • Chromodoris dianae nudibranch in Ambon, Indonesia
    Chromodoris-dianae-nudibranch-ambon-...tif
  • Nembrotha kubaryana nudibranchs mating on a coral reef in Ambon, Indonesia
    Nembrotha-kubaryana-nudibranchs-mati...tif
  • Aegires gardineri nudibranch photographed at Sawa Sawa Sawaga in Milne Bay, Papua New Guinea
    Aegires-gardineri-nudibranch-milne-b...tif
  • Beautiful whitish Hypselodoris bullocki nudibranch in a mucky bay at Sanambiet Island off New Ireland in Papua New Guinea
    Hypselodoris-bullocki-nudibranch-lag...tif
  • Super Macro photograph of a rhinophore of a beautiful lavender, white and yellow Hypselodoris bullocki nudibranch in Milne Bay, Papua New Guinea
    Hypselodoris-bullocki-rhinophore-mil...tif
  • Hermaphroditic sea hares (Aplysia sp.) engaging in copulation and egg-laying in shallow water, at a depth of about five meters
    sea-hares-laying-eggs-aplysia-japan-...tif
  • This is a Goniobranchus geometricus nudibranch. Photographed in Kagoshima Prefecture, Japan.
    goniobranchus-geometricus-nudibranch...tif
  • Unidentified aeolid nudibranchs (Favorinus sp.) that appear to be feeding on eggs in a bubble-like egg case. The egg case may be that of a polychaete worm, or possibly a headshield slug of bubble snail (Cephalaspidea). See http://www.tonywublog.com/journal/aeolid-nudibranchs-eating-eggs-of-polychaete-worms for a discussion of this topic. Photographed in Lembeh Strait, Indonesia.
    favorinus-aeolid-nudibranch-eating-p...tif
  • Rear view of a Nembrotha lineolata nudibranch moving along the reef, Ambon, Indonesia
    Nembrotha-lineolata-nudibranch-ambon...tif
  • Mating cream-tinted Hypselodoris bullocki nudibranchs, Ambon, Indonesia
    mating-Hypselodoris-bullocki-nudibra...tif
  • This is a blue ocean slug (Glaucus atlanticus) that was washed ashore with a mass, multi-day stranding of thousands of blue bottles (Physalia physalis). These nudibranchs are part of the rarely seen blue community of the open ocean. They prey on other animals in that community, such as Physalia physalis, by-the-wind-sailors (Velella velella), blue buttons (Porpita porpita), and violet snails (Janthina janthina). Glaucus nudibranchs are immune to the venom of the blue bottles that they consume. They store their prey’s nematocysts and deploy them in specialized cnidosacs at the tips of their ornate cerata. Because these nudibranchs concentrate the venom of their prey, they can produce a more powerful sting than Physalia.
    glaucus-atlanticus-nudibranch-201711...tif
  • Tiny yellow Tambja sp. nudibranch in Lembeh Strait, North Sulawesi, Indonesia. Orange rhinophores with purple base and tips, white gills with purple tips.
    yellow-Tambja-nudibranch-lembeh-stra...tif
  • Hypselodoris iacula nudibranch moving along the reef in Ambon, Indonesia
    Hypselodoris-iacula-nudibranch-ambon...tif
  • Rear view of Chromodoris geometrica nudibranch in Ambon, Indonesia
    Chromodoris-geometrica-nudibranch-am...tif
  • Black and white Thecacera nudibranch with orange-tipped rhinophores. Ambon, Indonesia
    Thecacera-nudibranch-ambon-indonesia...tif
  • Ceratosoma sinuatum on the reef in Ambon, Indonesia
    Ceratosoma-sinuatum-nudibranch-ambon...tif
  • Nudibranch (Nembrotha cristata) eating a tunicate (Sigillina signifera). Ambon, Indonesia
    nudibranch-Nembrotha-cristata-eating...tif
  • Phyllodesmium jakobsenae nudibranch feeding on Xenia soft coral in Lembeh Strait, North Sulawesi, Indonesia
    Phyllodesmium-jakobsenae-nudibranch-...tif
  • Front-on view of Ceratosoma tenue nudibranch. Super macro photograph taken at 4x life-size magnification. Lembeh Strait, North Sulawesi, Indonesia.
    front-view-Ceratosoma-tenue-nudibran...tif
  • Aegires minor nudibranch in Bulolo Passage, located in the Barrier Reef of Papua New Guinea
    Aegires-minor-nudibranch-Papua-New-G...tif
  • Rear view of a Chromodoris kuniei nudibranch, taken in Simpson Harbour, Rabul, New Britain, Papua New Guinea
    Chromodoris-kuniei-nudibranch-simpso...tif
  • Gymnodoris aurita devouring a Marionia sp. nudibranch. The entire process took about 50 minutes.
    Gymnodoris-aurita-eating-Marionia-nu...tif
  • An unusual nudibranch (Gymnodoris impudica) with only a single rhinophore in the center of its head, cyclops-style. The centralized position of the lone rhinophore suggests that the nudibranch was likely born this way, though it is impossible to be certain.
    gymnodoris-impudica-nudibranch-singl...tif
  • A small Hypselodoris infucata nudibranch perched on a ledge, looking almost as if it is staring across a gulf at a larger Hypselodoris infucata nudibranch in the background. Both nudibranchs were feeding as they moved along the muck substrate in Lembeh Strait.
    Hypselodoris-infucata-nudibranchs-le...tif
  • Thecacera picta nudibranch feeding on bryozoans. Ambon, Indonesia
    Thecacera-picta-nudibranch-feeding-b...tif
  • White and yellow Glossodoris sp. nudibranch laying eggs in Ambon, Indonesia
    Glossodoris-nudibranch-laying-eggs-a...tif
  • Glossodoris atromarginata nudibranch projecting a shadow that looks like a rabbit. Ambon, Indonesia
    Glossodoris-atromarginata-rabbit-sha...tif
  • Thecacera sp. nudibranch trying to make headway against the current in Lembeh Strait, North Sulawesi, Indonesia
    yellow-black-Thecacera-nudibranch-st...tif
  • Rhinophores of a Hypselodoris infucata nudibranch in the muck, Lembeh Strait, North Sulawesi, Indonesia. Super macro photograph taken at 3x life-size
    Super-macro-photograph-Hypselodoris-...tif
  • Yellow-orange Cadlinella ornatissima nudibranch with characteristic pink-tipped tubercles and white rhinophores
    cadlinella-ornatissima-nudibranch-le...tif
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Tony Wu Underwater Photography

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