<p><strong>Fig. 3.21.</strong> (<strong>A</strong>) Scanning electron microscope (SEM) images illustrating the wide diversity of sponge spicule shapes</p>

Fig. 3.21. (A) Scanning electron microscope (SEM) images illustrating the wide diversity of sponge spicule shapes

Image courtesy of Van Soest et al. (2012) Global Diversity of Sponges (Porifera). PLoS ONE 7(4): e35105. doi:10.1371/journal.pone.0035105. Adapted from Wikimedia Commons.