Echinoids or sea urchins are very common in today's oceans and are common as fossils also.
Echinoids are part of the larger animal group known as echinoderms, which includes starfish and crinoids.
They are found on most continents and are widely collected. Some are called "sand dollars"

Sea Urchin Echinoid Dendraster gibbsi. U us02 San Pedro formation, Coyote Hills, California, U.S.A. Pliocene 5 Million years old Specimen is 47x46mm. Aust. $45.00 All sizes are approximate This is a one only fossil and may not be available. If you require a fossil bigger or smaller than the feature please e-mail us with your request.