Sea Urchins: Class Echinoidea

The Class Echinoidea consists of about 940 species of echinoids known as Sea Urchins.  Sea urchings inhabit marine habitats from the intertidal zone to about 5000 meters deep.  The following orders are present in this class. 

• Order Cassiduloida
• Order Spatangoida
• Order Diadematoida
• Order Echinothurioida
• Order Pedinoida
• Order Arbacioida
• Order Echinoida
• Order Phymosomatoida
• Order Salenioida
• Order Temnopleuroida
• Order Clypeasteroida
• Order Holectypoida
• Order Cidaroida