are purple sea urchins in japan
About. The purple sea urchin, Strongylocentrotus purpuratus, lives along the eastern edge of the Pacific Ocean extending from Ensenada, Mexico to British Columbia, Canada. This sea urchin species is deep purple in color and lives in lower intertidal and nearshore subtidal communities.It normally grows to a diameter of about 4 inches and may live as long as 70 years. Read more at Wikipedia. This entry is from. , the user-contributed encyclopedia.his sea urchin species is deep purple in color and lives in lower intertidal and nearshore subtidal communities. It normally grows to a diameter of about 4 inches and may live as long as 70 years. Read more at Wikipedia. This entry is from. , the user-contributed encyclopedia.