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Why are echinoderms radially symmetric?

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How the radial body plan of echinoderms is related to the bilateral body plan of their deuterostome relatives, the hemichordates and the chordates, has been a long-standing problem. read more

At metamorphosis time, most echinoderms recycle the larval tissue to form the more or less radially symmetrical adult. An oddball seastar ‘sprouts’ out of its larval body to form the pentaradially symmetrical adult. read more

1. Because they can move in all directions. The animals does not have to bend. 2. Because when a predator is caught by 2 arms, the other arms can be effectively used to price open the animal by constantly putting pressure on the body part. read more

Echinoderms exhibit secondary radial symmetry in portions of their body at some stage of life. This, however, is an adaptation to their sessile existence. They developed from other members of the Bilateria and exhibit bilateral symmetry in their larval stage. read more

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Echinoderms (Echinodermata)
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