Sea Urchin Spines, SEM

Sea Urchin Spines, SEM

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Caption: Common Sea Urchin Spines, coloured scanning electron micrograph (SEM). Common Sea urchins (Echinus esculentus) are marine echinoderms, relatives of the starfish. They possess a shell, or test, covered in numerous movable spines which protect them from predators. The sea urchin test has five-fold symmetry. They feed on algae and other organic material that they scrape from the surface of rocks. Magnification unknown.

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Keywords: biology, echinoderm, echinodermata, echinus esculentus, exoskeleton, five-fold symmetry, marine, scanning electron micrograph, scanning electron microscope, sea, sea urchin, sem, shell, spike, spikes, spiky, spine, spines, spiny, test, zoology

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