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 ...

Inside the spiky test are five corals of roe, sometimes called tongues—the sea urchin’s wobbly gonads. Karoline O.A. Pettersen Sea urchins with their skin and spines removed. Jennifer Steen ...