1. Intro to Zoology – Unit 1
Animal Body Plans

2. Animal Symmetry
Symmetry –Refers to balanced proportions, or correspondence in size and shape of parts on opposite sides of a mid-line.
Asymmetrical – Body design that is not divisible into equivalent parts.

3. Radial symmetry Oriented around the center of its axis.
Looks like the hub of a wheel with spokes.
Best examples of radial symmetry in zoology are starfish and sea anemones.

4. Bilateral Symmetry Also referred to as mirror symmetry
If a bilateral animal were divided in half, each half would look very much alike

5. Key terms in locating regions of animal bodies
Anterior – Designates the head, or front end
Posterior – The opposite or tail end
Dorsal – The side usually away from the pull of gravity; the back side
Ventral – The side usually toward the pull of gravity; the belly side
Appendages – Coming from the main body trunk; used for locomotion and feeding

6. Key terms in locating regions of animal bodies
Medial – midline of the body
Lateral – the sides of the body
Proximal – parts that are nearer the middle of the body
Distal – Parts that are farther from the middle of the body

7. Skeletal Support
Endoskeleton – Provides internal support and structure
Exoskeleton – Provides support and structure outside the body’s muscle tissue

8. What type of symmetry do each of the following exhibit?

9. 1.

10. 2.

11. 3.

12. 4.

13. 5.

14. 6.

15. 7.

16. 8.

17. 9.

18. 10.