Research Article

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

Figure 4

Scanning electron micrographs of spine tubercles of Brisaster fragilis. ((a) and (b)) Plastron tubercles; ((c) and (d)) anterior tubercles. A: areole; C: nodules of the crenulation; M: mamelon; P: platform; S: smooth area of platform.
297631.fig.004a
(a)
297631.fig.004b
(b)
297631.fig.004c
(c)
297631.fig.004d
(d)