Sea urchins and sand dollars

Phylum Echinodermata Class Echinoidea Number of families 46

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Ubiquitous, spine-covered animals that often live beneath the sand surface or hide out in rocky crevices and sea grass beds

Photo: Red sea urchin (Strongylocentrotus francis-canus) (┬ęShedd Aquarium Photo by Patrice Ceisel. Reproduced by permission.)

Phylum Echinodermata Class Echinoidea Number of families 46

Thumbnail description

Ubiquitous, spine-covered animals that often live beneath the sand surface or hide out in rocky crevices and sea grass beds

Photo: Red sea urchin (Strongylocentrotus francis-canus) (┬ęShedd Aquarium Photo by Patrice Ceisel. Reproduced by permission.)

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