Echinacea (echinoderm)
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.
Child taxa
According to World Register of Marine Species:- Order Arbacioida -- 1 extant family and 2 fossils
- Order Camarodonta
- * Infraorder Echinidea -- 5 extant families
- * Infraorder Temnopleuridea -- 2 extant families and 2 fossils
- Order Stomopneustoida -- 2 extant families and 1 fossil
- Family Glyphopneustidae Smith & Wright, 1993 †