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