|Sea Urchin Temporal range:
|Echinoidea Leske, 1778
What are sea urchins classified as?
Sea urchins belong to the phylum Echinodermata–the same group as sea stars, sand dollars, sea lilies and sea cucumbers. Although difficult to see through all the spines, sea urchins also have a hard outer body like that of its relatives.
Are sea urchins real animals?
Sea urchins are animals that are typically small, spiny and round. They live in all the earth’s oceans, at depths ranging from the tide line to 15,000 feet.
Are sea urchins a plant or animal?
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).