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  • This is a blue ocean slug (Glaucus atlanticus) approaching the venom-filled tentacles of a blue bottle (Physalia utriculus). 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 utriculus, 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
  • This is a blue ocean slug (Glaucus atlanticus) that was washed ashore with a mass, multi-day stranding of thousands of blue bottles (Physalia utriculus). 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 utriculus, 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
  • 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
  • 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
  • This is a Goniobranchus geometricus nudibranch. Photographed in Kagoshima Prefecture, Japan.
    goniobranchus-geometricus-nudibranch...tif
  • This is a head-on, close-up view of a colorful Nembrotha purpureolineata nudibranch
    nembrotha-purpureolineata-nudibranch...tif
  • Yellow-orange Cadlinella ornatissima nudibranch with characteristic pink-tipped tubercles and white rhinophores
    cadlinella-ornatissima-nudibranch-le...tif
  • Chromodoris hintuanensis lifting its skirt
    Chromodoris-hintuanensis-nudibranch-..tiff
  • Dramatic lighting for a nudibranch that is common in the Indo-Pacific region, Chromodoris annae
    Chromodoris-annae_nudibranch-ambon-2..tiff
  • A pair of Nembrotha cristata nudibranchs enjoying a morning tryst
    green-and-black-Nembrotha-cristata-n..tiff
  • Dramatic lighting for a nudibranch that is common in the Indo-Pacific region, Chromodoris annae
    Chromodoris-annae_nudibranch-ambon-2..tiff
  • Wide-angle macro photograph of a large, red Spanish dancer nudibranch scavenging the reef at night in Ambon, Indonesia
    Spanish-dancer-Hexabranchus-sanguine..tiff
  • Glossodoris nudibranch moving along the reef
    Glossodoris_nudibanch-Ambon-201011-3..tiff
  • A cute baby Jorunna rubescens nudibranch
    Jorunna-rubescens-nudibranch-juvenil..tiff
  • Wide-angle macro photograph of a large, red Spanish dancer nudibranch scavenging the reef at night in Ambon, Indonesia
    Red-Spanish-dancer-Hexabranchus-sang..tiff
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Tony Wu Underwater Photography

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