Constantinos Petrinos / Collector urchin (Tripneustes gratilla) detail close up, Lembeh Strait, North Sulawesi, Indonesia.
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Constantinos Petrinos / Urchin bumblebee shrimp (Gnathophyllides mineri) living commensally with Collector Urchin (Tripneustes gratilla), close up. Lembeh Strait, North Sulawesi, Indonesia.
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Constantinos Petrinos / Urchin bumblebee shrimp (Gnathophyllides mineri) living commensally with Collector Urchin (Tripneustes gratilla), close up. Lembeh Strait, North Sulawesi, Indonesia.
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Constantinos Petrinos / Urchin bumblebee shrimp (Gnathophyllides mineri) living commensally with Collector Urchin (Tripneustes gratilla), close up. Lembeh Strait, North Sulawesi, Indonesia.
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Constantinos Petrinos / Urchin bumblebee shrimp (Gnathophylloides mineri) living commensally with Collector Urchin (Tripneustes gratilla), close up. Lembeh Strait, North Sulawesi, Indonesia.
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Georgette Douwma / Collector urchin (Tripneustes gratilla)Debris tends to 'collect' on these urchins, hence their name. Mabul, Malaysia. Indo-Pacific.
Sue Daly / Sea Urchin (Trypneustes gratilla) Poor Knights Islands, New Zealand, January
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Doug Perrine / Horned helmet shell (Cassis cornuta) probes a Collector urchin or hawa e maoli (Tripneustes gratilla) and rises up to pounce on it, Honokohau, Kona, Big Island, Hawaii, Central Pacific Ocean
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David Fleetham / Collector urchin (Tripneustes gratilla), spawning, releasing eggs or sperm, Hawaii.
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Georgette Douwma / Cake urchin (Tripneustes gratilla) Cebu, Malapascua Island, Philippines, September
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Georgette Douwma / Cake urchin (Tripneustes gratilla) Cebu, Malapascua Island, Philippines, September
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David Fleetham / Short spined collector urchin (Tripneustes gratilla) on a coral reef, Hawaii, Pacific Ocean.
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David Fleetham / Short spined collector urchin (Tripneustes gratilla) collecting algae and pieces of shell on its spines for camouflage,Hawaii, Pacific Ocean.
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David Fleetham / Short spined collector urchin (Tripneustes gratilla) close up detail of starfish-like tube feet used for collecting algae and for movement, Hawaii. pacific Ocean.