Sergio Hanquet / Purple sea urchin (Sphaerechinus granularis), three of different colours. Tenerife, Canary Islands.
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Sergio Hanquet / Purple sea urchin (Sphaerechinus granularis) mouth and spines, close up. Tenerife, Canary Islands.
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Sergio Hanquet / Mass of Purple sea urchins (Sphaerechinus granularis) high numbers may be related reproduction cycle. Tenerife, Canary Islands.
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Sergio Hanquet / Purple sea urchins (Sphaerechinus granularis), high numbers may be related reproduction cycle. Tenerife, Canary Islands.
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Sergio Hanquet / Purple sea urchin (Sphaerechinus granularis) many on seabed, high numbers may be related reproduction cycle. Tenerife, Canary Islands.
Franco Banfi / Sea urchin (Sphaerechinus granularis) on coral covered with mucilage, a symptom of rising sea temperature, Vis Island, Croatia, Adriatic Sea, Mediterranean.