Subterclass
Echinacea
Mesocentrotus franciscanus. Photo: (c) juliabohemian, 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.
CLICK TO MANAGE