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AKA sea Potato
2 " ( 50 mm) long
Short very dense brown spines point backwards which assist burrowing in this urchin. when the Urchin has burrowed down vertically it ploughs its way Forward where it obtains a diet of plant and animal detritis. As with other Urchins Eggs and sperm are librerated into water at breeding times , these Urchins live in Groups
bravenet.com
