Spiny starfish

Spiny starfish

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Caption: Spiny starfish (Marthasterias glacialis) on the sea floor. This large starfish measures about 40 centimetres in diameter, but exceptional individuals can reach 80 centimetres across. It lives between the surface and 150 metres depth, mainly on hard substrates, and also sandy seabeds, as seen here. Each of its five arms has rows of sharp spines. The starfish moves on the hundreds of tube feet on the undersides of its five arms. Its mouth is under the centre of its body. Starfish mainly eat bivalve molluscs, whose shells they open by attaching one of their legs to each of the molluscs' two shells and pulling. Photographed in the Mediterranean Sea.

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Keywords: animal, biological, biology, brown, camouflage, camouflaged, carnivore, carnivorous, defence, echinoderm, echinodermata, fauna, floor, french, invertebrate, invertebrates, marine, marthasterias glacialis, mediterranean sea, nature, ocean, oceanic, one, predator, predatory, sand, sandy, seabed, single, spines, spiny starfish, starfish, temperate, underwater, water, wildlife, zoological, zoology

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