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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. Echinacea are part of Animalia (Kingdom), Echinodermata (Phylum), Echinozoa (Subphylum), Echinoidea (Class), Euechinoidea (Subclass), Carinacea (Infraclass). ==Child taxa== According to World Register of Marine Species:〔(【引用サイトリンク】url=http://www.marinespecies.org/aphia.php?p=taxdetails&id=149855 )〕 * Order Arbacioida (Gregory, 1900) -- 1 family and 2 fossiles * Order Camarodonta (Jackson, 1912) * * Infra-order Echinidea (Kroh & Smith, 2010) -- 5 families * * Infra-order Temnopleuridea (Kroh & Smith, 2010) -- 2 families and 2 fossiles * Order Stomopneustoida (Kroh & Smith, 2010) -- 2 families and 1 fossile * Family Glyphopneustidae Smith & Wright, 1993 † Image:Arbacia lixula (oursin noir).JPG| an Arbacioida Image:Paracentrotus lividus profil.JPG| an Echinidea Image:Black sea urchin (Temnopleurus toreumaticus).jpg| a Temnopleuridea Image:S. variolaris.jpg| a Stomopneustoida 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Echinacea (animal)」の詳細全文を読む スポンサード リンク
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