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  • Pictured here are intermediate sea urchins (Strongylocentrotus intermedius) spawning in the evening. Found in the northwest Pacific, this species is one of several that are regularly consumed by people. The orange urchin is female, which releases eggs after detecting sperm that has been released by males.
    strongylocentrotus-intermedius-inter...tif
  • This is the test, or hard interior shell, of a heart urchin found at Mounu Island in Vava’u, Kingdom of Tonga
    heart-urchin-tonga-30102015.tif
  • This is the test, or hard interior shell, of a flower urchin (Toxopneustes pileolus). Found and photographed in Kannoura, Toyo-cho, Kochi-ken, Shikoku, Japan.
    flower-urchin-test-toxopneustes-pile...tif
  • Pair of Coleman shrimp (Periclimenes colemani) on fire urchin (Asthenosoma varium). Ambon, Indonesia
    Periclimenes-colemani-Coleman-shrimp...tif
  • This is a male banded sea urchin (Echinothrix calamaris) engaged in broadcast spawning. Other nearby individuals released gametes around the same time, though the spawning was not exactly synchronized. Photographed in Kagoshima Prefecture, Japan.
    echinothrix-calamaris-urchin-broadca...tif
  • Close-up portrait of zebra crab (Zebrida adamsii) on a colorful fire sea urchin (Asthenosoma varium)
    zebra-crab-and-fire-urchin-ambon-201..tiff
  • This is a male intermediate sea urchin (Strongylocentrotus intermedius) commencing the process of broadcast spawning. On this particular day, only a few urchins were spawning.
    strongylocentrotus-intermedius-urchi...tif
  • Pictured here are male intermediate sea urchins (Strongylocentrotus intermedius) commencing the spawning process by emitting sperm into the water. Female urchins release eggs upon sensing the sperm. Found in the northwest Pacific, this species is one of several that are regularly consumed by people.
    strongylocentrotus-intermedius-inter...tif
  • Pictured here are intermediate sea urchins (Strongylocentrotus intermedius) spawning in the evening. Found in the northwest Pacific, this species is one of several that are regularly consumed by people. The orange urchin is a female releasing eggs after detecting sperm that has been released by males.
    strongylocentrotus-intermedius-inter...tif
  • This is a male Japanese sea biscuit urchin (Clypeaster japonicus) engaged in broadcast spawning. This urchin and many others were gathered in shallow water. Ocean swells rapidly disbursed the gametes. Photographed in Kagoshima Prefecture, Japan.
    clypeaster-japonicus-urchin-broadcas...tif
  • This is a top-down view of a male intermediate sea urchin (Strongylocentrotus intermedius) commencing the process of broadcast spawning.
    strongylocentrotus-intermedius-urch...tif
  • This is the test, or hard interior shell, of a Diadema setosum sea urchin. Found and photographed in Kannoura, Toyo-cho, Kochi-ken, Shikoku, Japan.
    diadema-setosum-sea-urchin-test-japa...tif
  • Zebra crab (Zebrida adamsii) on venomous fire urchin (Asthenosoma varium) in Ambon, Indonesia
    zebra-crab-Zebrida-adamsii-venomous-...tif
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Tony Wu Underwater Photography

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