sea urchin hid coral the surf urchins are typically spiny globular animals echinoderms class echinoidea |
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| Sea urchins, are typically spiny, globular animals, echinoderms in the class Echinoidea. About 950 species live on the seabed, inhabiting all oceans and depth zones from the intertidal to 5,000 metres 16,000 ft; 2,700 fathoms. Their tests hard shells are round and spiny, typically from 3 to 10 cm 1 to 4 in across. Sea urchins move slowly, crawling with their tube feet, and sometimes pushing |
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