The sea urchin skeleton is formed in the mesoderm and lies embedded ... In life the pore space is filled with connective tissue which is termed stroma. The design of the echinoid skeleton is thought ...

IT has long been known that certain littoral echinoids habitually cover the parts of their body that are exposed to light by fragments taken from their surroundings. Some have interpreted this as ...

This project systematically visualizes the internal (and external) anatomy of selected sea urchin specimens representing 13 of the 14 currently recognized sea urchin orders. The only specimens that ...