David Fleetham / Blue-spotted Sea Urchin (Astropyga radiata) expelling waste from the sac in the center of it's body. Maui, Hawaii.
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Constantinos Petrinos / Yellow stripe clingfish (Diademichthys lineatus) living in association with the Fire Urchin (Astropyga radiata) Lembeh Strait, North Sulawesi, Indonesia.
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Georgette Douwma / False fire urchin (Astropyga radiata) grouped on sandy bottom. Lembeh Strait, North Sulawesi, Indonesia.
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Georgette Douwma / Radiant sea urchin {Astropyga radiata} with Cardinal fish Sulawesi Indonesia
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David Fleetham / Detail of Blue-spotted Sea Urchin (Astropyga radiata). A rare visitor to Hawaii.
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David Fleetham / Adam's urchin / Zebra crab (Zebrida adamsii) carrying eggs under its body on a venomous Radiant sea urchin (Astropyga radiata). Rinca island, Komodo National Park, Indonesia.
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Constantinos Petrinos / Aggregation of Blue-spotted urchins (Astropyga radiata) Lembeh Strait, North Sulawesi, Indonesia.
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Constantinos Petrinos / Aggregation of Blue-spotted urchins (Astropyga radiata) Lembeh Strait, North Sulawesi, Indonesia.
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Constantinos Petrinos / Fire urchin (Astropyga radiata) close up, Lembeh Strait, North Sulawesi, Indonesia.
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Constantinos Petrinos / Yellow stripe clingfish (Diademichthys lineatus) living in association with the Fire Urchin (Astropyga radiata) Lembeh Strait, North Sulawesi, Indonesia.
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Alex Mustard / Banggai cardinalfish (Pterapogon kaudemi) swimming over a long-spined sea urchin (Astropyga radiata) Bitung, North Sulawesi, Indonesia. Lembeh Strait, Molucca Sea.
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Alex Mustard / Radiant sea urchins (Astropyga radiata) home toZebra urchin crab (Zebrida adamsii) and banggai cardinalfish (Pterapogon kaudemi) with schooling silversides behind, in shallow water. Bitung, North Sul...