Radial symmetry
Radial Symmetry
Radial symmetry (pronunciation: /ˈreɪdiəl ˈsɪmɪtri/) is a type of symmetry where an organism or object can be divided into similar halves by more than two planes passing through the center. This type of symmetry is common in many biological organisms, particularly those that are sessile or planktonic.
Etymology
The term "radial symmetry" is derived from the Latin radius, meaning "ray", and the Greek symmetria, meaning "measure together". This reflects the characteristic of radial symmetry where all parts radiate out from a central point.
Related Terms
- Bilateral symmetry: A type of symmetry where an organism can be divided into mirror-image halves along one plane.
- Asymmetry: A lack of symmetry, common in many higher animals.
- Pentaradial symmetry: A type of radial symmetry that is five-fold, common in echinoderms like starfish and sea urchins.
- Sessile: Organisms that are fixed in one place; many sessile organisms exhibit radial symmetry.
- Planktonic: Organisms that float or drift in water; many planktonic organisms also exhibit radial symmetry.
See Also
External links
- Medical encyclopedia article on Radial symmetry
- Wikipedia's article - Radial symmetry
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