Echinarachnius (Sand dollar)
Echinarachnius: Comprehensive Overview of the Sand Dollar Genus Echinarachnius is a genus of echinoderms commonly known as “sand dollars,” most notably represented by Echinarachnius parma. Sand dollars are easily recognized by their flat, disc-like bodies and intricate symmetrical patterns visible on their skeleton, or “test.” Unlike typical sea urchins, Echinarachnius lack prominent spines and are […]