Sea urchin larva. Light micrograph of a larva of an unidentified sea urchin. Free-swimming echinoderm larvae are known as pluteus larvae. They bear a number of ciliated 'arms', sometimes supported by calcareous rods. Unlike adult sea urchins, which have a five-way radial symmetry, pluteus larvae are bi-laterally symmetrical. Magnification: x40 at 35mm size.

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