Locomotion and Functional Spine Morphology of the Heart Urchin Brisaster fragilis, with Comparisons to B. latifrons

Figure 1

((a) to (f)) Brisaster fragilis; ((g) to (i)) Brisaster latifrons; ((a), (d), and (g)) dorsal view; ((b), (e), and (h)) ventral view; ((c), (f), and (i)) lateral view. AL: anterolateral spines; AM: ambulacra; AS: anterior spines; M: mouth; PL: plastron; SS: spatulate spines.