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  • This is a Cavolinia uncinata, a species of small pelagic mollusk that is found around the world. Tens, perhaps hundreds of thousands of individuals or more appeared for several days in southern Japan, drifting with currents. As pictured here, the snails use nets of mucus to capture food.
    cavolinia-uncinata-sea-butterfly-jap...tif
  • This is a Cavolinia uncinata, a species of small pelagic mollusk that is found around the world. Tens, perhaps hundreds of thousands of individuals or more appeared for several days in southern Japan, drifting with currents. As pictured here, the snails use nets of mucus to forage for food.
    cavolinia-uncinata-sea-butterfly-jap...tif
  • 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
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