sea urchin | Description, Anatomy, & Facts | Britannica.com

November 30, 2021

Sea urchin: Sea urchin, any of about 950 living species of spiny marine invertebrate animals (class Echinoidea, phylum Echinodermata) with a globular body and a radial arrangement of organs, shown by five bands of pores running from mouth to anus over the test (internal skeleton).

: https://www.britannica.com/animal/sea-urchin

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