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Zoology
Chapter 3: Animal Architecture and Symmetry
| Term | Definition |
|---|---|
| Plane | a flat surface of two dimensions |
| Symmetry | a balanced plane that can be divided into equal parts by a line of symmetry. |
| 3 types of body planes | Frontal, Sagittal and Transverse plane |
| Frontal plane | a plane that divides the animal into dorsal and ventral sections. |
| Sagittal Plane | a plane that divides the animal into left and right sections. |
| Transverse plane | a plane that divides an animal into anterior and posterior sections |
| 5 types of symmetry in animals | Asymmetry, Bilateral symmetry, Radial Symmetry, Bi-Radial Symmetry, Spherical Symmetry |
| Asymmetry | no balanced body plane |
| examples of asymmetry | some sponges, tunicates, amoebas |
| Bilateral symmetry | a mid-sagittal plane divides into left and right halves. |
| Examples of bilateral symmetry | most animals - butterfly |
| Radial symmetry | two or more planes passing through the central axis divides into equal proportions. |
| examples of radial symmetry | jelly fishes, sea anemones, most echinoderms |
| Bi-Radial symmetry | similar to radial symmetry, except that a structure or structures on the external surface allow only one plane to divide the animal into equal parts. |
| Examples of Bi-radial symmetry | comb jellies, some echinoderms, sea star |
| Spherical Symmetry | any plane passing through the central axis will divide the animal into equal parts. |
| Examples of spherical symmetry | some algae and some protozoans, Volvox |
Created by:
SilverLady
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