👉 The term "ophiurid" refers to a group of small, ancient marine organisms that lived in the oceans and were primarily made up of calcium carbonate. These organisms were found on the continental shelves of South America, Africa, and Asia, and their fossils have been discovered at sites such as the Salar de Uyuni, Chile, and the Kilauea volcano, Hawaii. The ophiurid group includes a variety of marine animals, including mollusks (such as