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Question

What is the definition of radial symmetry?


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Solution

Radial symmetry:

  1. Sessile and bottom-dwelling organisms, such as sea anemones and starfish, have a fundamental body plan in which the organism can be divided into comparable halves by passing a plane at any angle along a central axis.
  2. The body of a person with radial symmetry has the general shape of a short or long cylinder or bowl, with a central axis from which the body parts radiate or are arranged in a regular pattern.
  3. As a result, the major axis is known as the oral-aboral (or anteroposterior) axis.
  4. Any plane crossing across this axis will divide the animal into symmetrical halves unless the species has an odd number of pieces organized in a circular pattern (as in the five-armed sea stars).
  5. Cnidarians (including jellyfish and coral) and echinoderms have radial symmetry (such as sea urchins, and brittle stars).

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