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 <small>(Gregory, 1900)</small> -- 1 extant family and 2 fossils
- Order Camarodonta <small>(Jackson, 1912)</small>
- Infraorder Echinidea <small>(Kroh & Smith, 2010)</small> -- 5 extant families
- Infraorder Temnopleuridea <small>(Kroh & Smith, 2010)</small> -- 2 extant families and 2 fossils
- Order Stomopneustoida <small>(Kroh & Smith, 2010)</small> -- 2 extant families and 1 fossil
- Family Glyphopneustidae <small> Smith & Wright, 1993</small> âÂÂ
References