The sea urchins and sand dollars: echinoderms with a rigid, globular or flattened shell (test) covered in movable spines used for defense and locomotion. Echinoidea graze algae from rock surfaces using a complex five-part jaw structure known as Aristotle's lantern.
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Disputed
Member Species/Taxa CountApproximate described-species (or, for a genus, described-taxon) count; continually revised as species are newly described, reclassified or synonymized. Taxonomic Rank Scientific Name Connections
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