Body symmetry
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Animal classification is based on characteristics like the presence of a vertebral column or backbone and the type of body symmetry. Most animals have bilateral symmetry, meaning their bodies can be divided into matching left and right halves. A small percentage have radial symmetry arranged like a wheel or are asymmetrical with no clear pattern. Body symmetry allows for streamlining and the formation of a central nervous system.
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Body symmetry
- 2. Introduction Animal classification When classifying animals we look at some major characteristics. Vertebrae- this is a bone structure that supports and protects the spinal chord of animals. The spinal chord connects the brain to every nerve in the body. Invertebrates- are animals without a backbone. 97% of all animal species are invertebrates. These animals have other protective structures, like shells and exoskeletons.
- 3. Symmetry Arrangement of body parts around a central axis • • Types of Body Symmetry Asymmetrical - animals have no particular symmetry. Radial symmetry - means the animal is organized similar to a wheel. Any longitudinal cut will give off in an equal half. • Bilateral symmetry - means the animal has definite right and left halves.
- 5. Most animals are bilaterally symmetric, including humans. It could be divided into matching halves by drawing a line down the center. It permits streamlining, favors the formation of a central nerve center, contributes to cephalization, and promotes actively moving organisms.
- 6. Radial Symmetry Radially symmetric animals are symmetrical about an axis extending from the center of the oral surface.
- 7. Asymmetrical Do not show definite symmetry.
- 8. • Biradial symmetry In addition to the anteroposterior axis, there are also two other axes or planes of symmetry at right angles to it and to each other.