Figure 9.

Model of pigmentation mosaics in the transition from bilaterality to a radial body plan. A bilaterally symmetric larva adjacent to a test of H. pulcherrimus with spines and tube feet removed that reveals a major 5-fold symmetry characteristic of this phyla and a minor division of these of the five sections to yield 10 repeating segments. Each of the pentameric regions contain a bilateral region that may have different pigmentation. Pigmentation in each of the mosaics follows a 10-fold symmetry (5 times bilateral symmetry, enabling for example, half-pigmented animals, or a small slice (1/10) of albinism, or both, as present in this animal.