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This is entirely absent in sea urchins, which are unable to move in this way.

Typical sea urchins have spines about 1 to 3 cm (0.39 to 1.18 in) in length, 1 to 2 mm (0.039 to 0.079 in) thick, and more or less sharp.

The sea urchin builds its spicules, the sharp, crystalline "bones" that constitute the animal’s endoskeleton, in the larval stage.

The fully formed spicule is composed of a single crystal with an unusual morphology.

The plates are covered in rounded tubercles, to which the spines are attached.

The inner surface of the test is lined by peritoneum.

Sea urchins move slowly, feeding primarily on algae.

Each of these areas consists of two rows of plates, so the sea urchin test includes 20 rows of plates in total.The mouth lies in the centre of the oral surface in regular urchins, or towards one end in irregular urchins.It is surrounded by lips of softer tissue, with numerous small, bony pieces embedded in it.The lower half of a sea urchin's body is referred to as the oral surface, because it contains the mouth, while the upper half is the aboral surface.Like other echinoderms, sea urchin early larvae have bilateral symmetry, but they develop five-fold symmetry as they mature.

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