<p><strong>Fig. 3.9.</strong> Asymmetrical body plans are rare in the animal kingdom, but they can be found in some sponge species such as red volcano sponge (<em>Acarnus erithacus</em>).</p>

Fig. 3.9. Asymmetrical body plans are rare in the animal kingdom, but they can be found in some sponge species such as red volcano sponge (Acarnus erithacus).

Image courtesy of National Oceanic and Atmospheric Administration (NOAA)