Does Metamerism occur in sea urchins?

Yes, metamerism occurs in sea urchins, although it is not as pronounced as in some other marine organisms. Sea urchins exhibit a form of metamerism known as secondary segmentation, where their bodies are organized into a series of repeating units. This segmentation contributes to their overall body plan and aids in their movement and feeding. However, the degree of segmentation is less evident compared to more distinctly segmented animals like earthworms.