Carinacea

The infraclassis Carinacea includes most living species of regular sea urchin, and fossil forms going back as far as the Triassic.

Taxonomy
List of orders according to World Register of Marine Species:
 * Superorder Calycina
 * Order Phymosomatoida†
 * Order Salenioida
 * Superorder Echinacea
 * Order Arbacioida (Gregory, 1900)
 * Order Camarodonta (Jackson, 1912)
 * Order Stomopneustoida (Kroh & Smith, 2010)
 * Family Glyphopneustidae Smith & Wright, 1993 †
 * Family Hemicidaridae Wright, 1857 †
 * Family Orthopsidae Duncan, 1889 †
 * Family Pseudodiadematidae Pomel, 1883 †