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Published byLorena Watkins Modified over 9 years ago
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Types of Symmetry and Animal Bodies
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Symmetry is the arrangement of body parts around a central plane or axis Asymmetry : occurs when the body can't be divided into similar sections (sponges) Radial symmetry: occurs when similar body parts are arranged around a central point like spokes on a wheel (echinoderms) Bilateral symmetry: occurs when animals can be divided into equal halves along a single plane
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Types of Symmetry and Animal Bodies Most animals with radial symmetry are sessile (attached) or sedentary (move very little). In animals with bilateral symmetry the right & left sides are mirror images of one another. Animals with bilateral symmetry are more complex, usually motile and are animals such as worms, arthropods, and all vertebrates. Animals with bilateral symmetry show cephalization which means that they have a head with sensory organs concentrated there.
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Dorsal: is the back or upper surface Ventral: is the belly or lower surface Anterior: head or front end Posterior: is the tail or hind end opposite the head Oral surface in echinoderms is where the mouth is located (underside) Aboral surface in echinoderms is the surface opposite the mouth (top side) Body Areas:
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