Translations:Adventist Youth Honors Answer Book/Nature/Marine Invertebrates/10/en
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f. Sea Urchin
Strongylocentrotus purpuratus 
Paracentrotus lividus
Sea Urchins are small, spiny sea creatures of the class Echinoidea found in oceans all over the world. (The name urchin is an old name for the round spiny hedgehogs sea urchins resemble.) Their shell, which is also called the "test", is globular in shape and covered with spines. The size of an adult test is typically from 3 to 10 cm.Typical sea urchins have spines that are 1 to 3 cm in length, 1 to 2 mm thick, and not terribly sharp. Common colors include black and dull shades of green, olive, brown, purple, and red.
