Sea urchins or urchins () are the class Echinoidea within the echinoderms. Approximately 950 species live on the seabed, inhabiting all oceans and depth zones from the intertidal zone which actually is not a fixed number but varies greatly, usually defined by the range between the highest and lowest tide, to deep seas of 5,000 m (16,000 ft).
Sea urchins or urchins () are the class Echinoidea within the echinoderms. Approximately 950 species live on the seabed, inhabiting all oceans and depth zones from the intertidal zone which actually is not a fixed number but varies greatly, usually defined by the range between the highest and lowest tide, to deep seas of 5,000 m (16,000 ft).
Source: Wikipedia "Sea urchin" · CC BY-SA 4.0
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