Subterclass
Echinacea
Strongylocentrotus purpuratus. Photo: (c) Robby Deans, some rights reserved (CC BY-NC)
The Echinacea are a superorder of sea urchins. They are distinguished by the presence of a rigid test, with ten buccal plates around the mouth, and solid spines. Unlike some other sea urchins, they also possess gills. The group is a large one, with species found worldwide.
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